Added rewrite.

2025-04-20 15:36:16 -04:00 · 2024-07-22 14:53:37 +02:00 · 2024-07-22 14:53:37 +02:00 · f8175a6433
commit f8175a6433
parent fa2d6d15a9
76 changed files with 3150 additions and 2453 deletions
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@ -143,6 +143,9 @@ importers:
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        specifier: ^1.18.2
        version: 1.18.2
      '@types/cookie-parser':
        specifier: ^1.4.7
        version: 1.4.7
      async:
        specifier: ^3.2.5
        version: 3.2.5
@ -282,6 +285,12 @@ importers:
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        specifier: ^3.2.24
        version: 3.2.24
      '@types/cross-spawn':
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        version: 6.0.6
      '@types/ejs':
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        version: 3.1.5
      '@types/express':
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        version: 4.17.21
@ -300,6 +309,9 @@ importers:
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        version: 21.1.7
      '@types/jsonminify':
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        version: 0.4.3
      '@types/jsonwebtoken':
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        version: 9.0.6
@ -312,6 +324,9 @@ importers:
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        version: 8.5.1
      '@types/resolve':
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        version: 1.20.6
      '@types/semver':
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        version: 7.5.8
@ -321,6 +336,9 @@ importers:
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        specifier: ^6.0.2
        version: 6.0.2
      '@types/tinycon':
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        version: 0.6.5
      '@types/underscore':
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        version: 1.11.15
@ -366,6 +384,9 @@ importers:
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        version: 5.5.3
      vitest:
        specifier: ^2.0.3
        version: 2.0.3(@types/node@20.14.11)(jsdom@24.1.0)
  ui:
    devDependencies:
@ -1459,6 +1480,9 @@ packages:
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@ -2530,6 +2610,10 @@ packages:
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@ -4359,6 +4549,11 @@ packages:
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@ -5424,6 +5619,10 @@ snapshots:
  '@types/content-disposition@0.5.8': {}
  '@types/cookie-parser@1.4.7':
    dependencies:
      '@types/express': 4.17.21
  '@types/cookie@0.4.1': {}
  '@types/cookiejar@2.1.5': {}
@ -5439,10 +5638,16 @@ snapshots:
    dependencies:
      '@types/node': 20.14.11
  '@types/cross-spawn@6.0.6':
    dependencies:
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    dependencies:
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  '@types/ejs@3.1.5': {}
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  '@types/express-serve-static-core@4.19.3':
@ -5493,6 +5698,8 @@ snapshots:
  '@types/json5@0.0.29': {}
  '@types/jsonminify@0.4.3': {}
  '@types/jsonwebtoken@9.0.6':
    dependencies:
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@ -5566,6 +5773,8 @@ snapshots:
      '@types/prop-types': 15.7.12
      csstype: 3.1.3
  '@types/resolve@1.20.6': {}
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  '@types/send@0.17.4':
@ -5603,6 +5812,8 @@ snapshots:
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      minipass: 4.2.8
  '@types/tinycon@0.6.5': {}
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@ -5710,6 +5921,39 @@ snapshots:
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      vue: 3.4.31(typescript@5.5.3)
  '@vitest/expect@2.0.3':
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      '@vitest/utils': 2.0.3
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  '@vitest/spy@2.0.3':
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  '@vitest/utils@2.0.3':
    dependencies:
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      tinyrainbow: 1.2.0
  '@vue/compiler-core@3.4.31':
    dependencies:
      '@babel/parser': 7.24.7
@ -5943,6 +6187,8 @@ snapshots:
  asap@2.0.6: {}
  assertion-error@2.0.1: {}
  ast-types@0.13.4:
    dependencies:
      tslib: 2.6.3
@ -6028,6 +6274,8 @@ snapshots:
  bytes@3.1.2: {}
  cac@6.7.14: {}
  cache-content-type@1.0.1:
    dependencies:
      mime-types: 2.1.35
@ -6061,6 +6309,14 @@ snapshots:
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  chai@5.1.1:
    dependencies:
      assertion-error: 2.0.1
      check-error: 2.1.1
      deep-eql: 5.0.2
      loupe: 3.1.1
      pathval: 2.0.0
  chalk@2.4.2:
    dependencies:
      ansi-styles: 3.2.1
@ -6076,6 +6332,8 @@ snapshots:
  character-entities-legacy@3.0.0: {}
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  chokidar@3.6.0:
    dependencies:
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@ -6233,6 +6491,8 @@ snapshots:
    dependencies:
      mimic-response: 3.1.0
  deep-eql@5.0.2: {}
  deep-equal@1.0.1: {}
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@ -6726,6 +6986,10 @@ snapshots:
  estree-walker@2.0.2: {}
  estree-walker@3.0.3:
    dependencies:
      '@types/estree': 1.0.5
  esutils@2.0.3: {}
  eta@3.4.0: {}
@ -6742,6 +7006,18 @@ snapshots:
      - supports-color
      - utf-8-validate
  execa@8.0.1:
    dependencies:
      cross-spawn: 7.0.3
      get-stream: 8.0.1
      human-signals: 5.0.0
      is-stream: 3.0.0
      merge-stream: 2.0.0
      npm-run-path: 5.3.0
      onetime: 6.0.0
      signal-exit: 4.1.0
      strip-final-newline: 3.0.0
  express-rate-limit@7.3.1(express@4.19.2):
    dependencies:
      express: 4.19.2
@ -6937,6 +7213,8 @@ snapshots:
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  get-func-name@2.0.2: {}
  get-intrinsic@1.2.4:
    dependencies:
      es-errors: 1.3.0
@ -6949,6 +7227,8 @@ snapshots:
  get-stream@6.0.1: {}
  get-stream@8.0.1: {}
  get-symbol-description@1.0.2:
    dependencies:
      call-bind: 1.0.7
@ -7194,6 +7474,8 @@ snapshots:
    transitivePeerDependencies:
      - supports-color
  human-signals@5.0.0: {}
  i18next-browser-languagedetector@8.0.0:
    dependencies:
      '@babel/runtime': 7.24.7
@ -7322,6 +7604,8 @@ snapshots:
    dependencies:
      call-bind: 1.0.7
  is-stream@3.0.0: {}
  is-string@1.0.7:
    dependencies:
      has-tostringtag: 1.0.2
@ -7580,6 +7864,10 @@ snapshots:
    dependencies:
      js-tokens: 4.0.0
  loupe@3.1.1:
    dependencies:
      get-func-name: 2.0.2
  lower-case@2.0.2:
    dependencies:
      tslib: 2.6.3
@ -7625,6 +7913,8 @@ snapshots:
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  merge-stream@2.0.0: {}
  merge2@1.4.1: {}
  methods@1.1.2: {}
@ -7661,6 +7951,8 @@ snapshots:
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  mimic-response@4.0.0: {}
@ -7774,6 +8066,10 @@ snapshots:
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@ -7842,6 +8138,10 @@ snapshots:
    dependencies:
      wrappy: 1.0.2
  onetime@6.0.0:
    dependencies:
      mimic-fn: 4.0.0
  only@0.0.2: {}
  openapi-backend@5.10.6:
@ -7932,6 +8232,8 @@ snapshots:
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  path-to-regexp@0.1.7: {}
@ -7940,6 +8242,10 @@ snapshots:
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  perfect-debounce@1.0.0: {}
  picocolors@1.0.1: {}
@ -8292,8 +8598,12 @@ snapshots:
      get-intrinsic: 1.2.4
      object-inspect: 1.13.1
  siginfo@2.0.0: {}
  signal-exit@3.0.7: {}
  signal-exit@4.1.0: {}
  sinon@18.0.0:
    dependencies:
      '@sinonjs/commons': 3.0.1
@ -8379,10 +8689,14 @@ snapshots:
  sprintf-js@1.1.3: {}
  stackback@0.0.2: {}
  statuses@1.5.0: {}
  statuses@2.0.1: {}
  std-env@3.7.0: {}
  streamroller@3.1.5:
    dependencies:
      date-format: 4.0.14
@ -8427,6 +8741,8 @@ snapshots:
  strip-bom@3.0.0: {}
  strip-final-newline@3.0.0: {}
  strip-json-comments@3.1.1: {}
  superagent@8.1.2:
@ -8520,8 +8836,16 @@ snapshots:
      esm: 3.2.25
    optional: true
  tinybench@2.8.0: {}
  tinycon@0.6.8: {}
  tinypool@1.0.0: {}
  tinyrainbow@1.2.0: {}
  tinyspy@3.0.0: {}
  to-fast-properties@2.0.0: {}
  to-regex-range@5.0.1:
@ -8730,6 +9054,23 @@ snapshots:
      unist-util-stringify-position: 4.0.0
      vfile-message: 4.0.2
  vite-node@2.0.3(@types/node@20.14.11):
    dependencies:
      cac: 6.7.14
      debug: 4.3.5(supports-color@8.1.1)
      pathe: 1.1.2
      tinyrainbow: 1.2.0
      vite: 5.3.4(@types/node@20.14.11)
    transitivePeerDependencies:
      - '@types/node'
      - less
      - lightningcss
      - sass
      - stylus
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      - supports-color
      - terser
  vite-plugin-static-copy@1.0.6(vite@5.3.4(@types/node@20.14.11)):
    dependencies:
      chokidar: 3.6.0
@ -8805,6 +9146,39 @@ snapshots:
      - typescript
      - universal-cookie
  vitest@2.0.3(@types/node@20.14.11)(jsdom@24.1.0):
    dependencies:
      '@ampproject/remapping': 2.3.0
      '@vitest/expect': 2.0.3
      '@vitest/pretty-format': 2.0.3
      '@vitest/runner': 2.0.3
      '@vitest/snapshot': 2.0.3
      '@vitest/spy': 2.0.3
      '@vitest/utils': 2.0.3
      chai: 5.1.1
      debug: 4.3.5(supports-color@8.1.1)
      execa: 8.0.1
      magic-string: 0.30.10
      pathe: 1.1.2
      std-env: 3.7.0
      tinybench: 2.8.0
      tinypool: 1.0.0
      tinyrainbow: 1.2.0
      vite: 5.3.4(@types/node@20.14.11)
      vite-node: 2.0.3(@types/node@20.14.11)
      why-is-node-running: 2.3.0
    optionalDependencies:
      '@types/node': 20.14.11
      jsdom: 24.1.0
    transitivePeerDependencies:
      - less
      - lightningcss
      - sass
      - stylus
      - sugarss
      - supports-color
      - terser
  void-elements@3.1.0: {}
  vue-demi@0.14.8(vue@3.4.31(typescript@5.5.3)):
@ -8862,6 +9236,11 @@ snapshots:
    dependencies:
      isexe: 2.0.0
  why-is-node-running@2.3.0:
    dependencies:
      siginfo: 2.0.0
      stackback: 0.0.2
  word-wrap@1.2.5: {}
  workerpool@6.5.1: {}
--- a/src/node/db/API.ts
+++ b/src/node/db/API.ts
@ -19,59 +19,61 @@
 * limitations under the License.
 */
-const Changeset = require('../../static/js/Changeset');
+import {deserializeOps} from '../../static/js/Changeset';
-const ChatMessage = require('../../static/js/ChatMessage');
+import ChatMessage from '../../static/js/ChatMessage';
-const CustomError = require('../utils/customError');
+import CustomError from '../utils/customError';
-const padManager = require('./PadManager');
+import * as padManager from './PadManager';
-const padMessageHandler = require('../handler/PadMessageHandler');
+import * as padMessageHandler from '../handler/PadMessageHandler';
-const readOnlyManager = require('./ReadOnlyManager');
+import {getPadId, getReadOnlyId} from './ReadOnlyManager';
-const groupManager = require('./GroupManager');
+import * as groupManager from './GroupManager';
-const authorManager = require('./AuthorManager');
+import * as authorManager from './AuthorManager';
-const sessionManager = require('./SessionManager');
+import * as sessionManager from './SessionManager';
-const exportHtml = require('../utils/ExportHtml');
+import {getPadHTML} from '../utils/ExportHtml';
-const exportTxt = require('../utils/ExportTxt');
+import {getTXTFromAtext} from '../utils/ExportTxt';
-const importHtml = require('../utils/ImportHtml');
+import {setPadHTML} from '../utils/ImportHtml';
-const cleanText = require('./Pad').cleanText;
+import {cleanText} from './Pad'
-const PadDiff = require('../utils/padDiff');
+import PadDiff from '../utils/padDiff';
-const {checkValidRev, isInt} = require('../utils/checkValidRev');
+import {checkValidRev, isInt} from '../utils/checkValidRev';
 import {Builder} from "../../static/js/Builder";
 import {Attribute} from "../../static/js/types/Attribute";
 /* ********************
 * GROUP FUNCTIONS ****
 ******************** */
-exports.listAllGroups = groupManager.listAllGroups;
+export const listAllGroups = groupManager.listAllGroups;
-exports.createGroup = groupManager.createGroup;
+export const createGroup = groupManager.createGroup;
-exports.createGroupIfNotExistsFor = groupManager.createGroupIfNotExistsFor;
+export const createGroupIfNotExistsFor = groupManager.createGroupIfNotExistsFor;
-exports.deleteGroup = groupManager.deleteGroup;
+export const deleteGroup = groupManager.deleteGroup;
-exports.listPads = groupManager.listPads;
+export const listPads = groupManager.listPads;
-exports.createGroupPad = groupManager.createGroupPad;
+export const createGroupPad = groupManager.createGroupPad;
 /* ********************
 * PADLIST FUNCTION ***
 ******************** */
-exports.listAllPads = padManager.listAllPads;
+export const listAllPads = padManager.listAllPads;
 /* ********************
 * AUTHOR FUNCTIONS ***
 ******************** */
-exports.createAuthor = authorManager.createAuthor;
+export const createAuthor = authorManager.createAuthor;
-exports.createAuthorIfNotExistsFor = authorManager.createAuthorIfNotExistsFor;
+export const createAuthorIfNotExistsFor = authorManager.createAuthorIfNotExistsFor;
-exports.getAuthorName = authorManager.getAuthorName;
+export const getAuthorName = authorManager.getAuthorName;
-exports.listPadsOfAuthor = authorManager.listPadsOfAuthor;
+export const listPadsOfAuthor = authorManager.listPadsOfAuthor;
-exports.padUsers = padMessageHandler.padUsers;
+export const padUsers = padMessageHandler.padUsers;
-exports.padUsersCount = padMessageHandler.padUsersCount;
+export const padUsersCount = padMessageHandler.padUsersCount;
 /* ********************
 * SESSION FUNCTIONS **
 ******************** */
-exports.createSession = sessionManager.createSession;
+export const createSession = sessionManager.createSession;
-exports.deleteSession = sessionManager.deleteSession;
+export const deleteSession = sessionManager.deleteSession;
-exports.getSessionInfo = sessionManager.getSessionInfo;
+export const getSessionInfo = sessionManager.getSessionInfo;
-exports.listSessionsOfGroup = sessionManager.listSessionsOfGroup;
+export const listSessionsOfGroup = sessionManager.listSessionsOfGroup;
-exports.listSessionsOfAuthor = sessionManager.listSessionsOfAuthor;
+export const listSessionsOfAuthor = sessionManager.listSessionsOfAuthor;
 /* ***********************
 * PAD CONTENT FUNCTIONS *
@ -104,7 +106,7 @@ Example returns:
 }
 */
-exports.getAttributePool = async (padID: string) => {
+export const getAttributePool = async (padID: string) => {
  const pad = await getPadSafe(padID, true);
  return {pool: pad.pool};
 };
@ -122,7 +124,7 @@ Example returns:
 }
 */
-exports.getRevisionChangeset = async (padID: string, rev: string) => {
+export const getRevisionChangeset = async (padID: string, rev: number) => {
  // try to parse the revision number
  if (rev !== undefined) {
    rev = checkValidRev(rev);
@ -155,7 +157,7 @@ Example returns:
 {code: 0, message:"ok", data: {text:"Welcome Text"}}
 {code: 1, message:"padID does not exist", data: null}
 */
-exports.getText = async (padID: string, rev: string) => {
+export const getText = async (padID: string, rev: number) => {
  // try to parse the revision number
  if (rev !== undefined) {
    rev = checkValidRev(rev);
@ -180,7 +182,7 @@ exports.getText = async (padID: string, rev: string) => {
  }
  // the client wants the latest text, lets return it to him
-  const text = exportTxt.getTXTFromAtext(pad, pad.atext);
+  const text = getTXTFromAtext(pad, pad.atext);
  return {text};
 };
@ -200,7 +202,7 @@ Example returns:
 * @param {String} authorId the id of the author, defaulting to empty string
 * @returns {Promise<void>}
 */
-exports.setText = async (padID: string, text?: string, authorId: string = ''): Promise<void> => {
+export const setText = async (padID: string, text?: string, authorId: string = ''): Promise<void> => {
  // text is required
  if (typeof text !== 'string') {
    throw new CustomError('text is not a string', 'apierror');
@ -225,7 +227,7 @@ Example returns:
 @param {String} text the text of the pad
 @param {String} authorId the id of the author, defaulting to empty string
 */
-exports.appendText = async (padID:string, text?: string, authorId:string = '') => {
+export const appendText = async (padID:string, text?: string, authorId:string = '') => {
  // text is required
  if (typeof text !== 'string') {
    throw new CustomError('text is not a string', 'apierror');
@ -247,7 +249,7 @@ Example returns:
 @param {String} rev the revision number, defaulting to the latest revision
 @return {Promise<{html: string}>} the html of the pad
 */
-exports.getHTML = async (padID: string, rev: string): Promise<{ html: string; }> => {
+export const getHTML = async (padID: string, rev: number): Promise<{ html: string; }> => {
  if (rev !== undefined) {
    rev = checkValidRev(rev);
  }
@ -264,7 +266,7 @@ exports.getHTML = async (padID: string, rev: string): Promise<{ html: string; }>
  }
  // get the html of this revision
-  let html = await exportHtml.getPadHTML(pad, rev);
+  let html = await getPadHTML(pad, rev);
  // wrap the HTML
  html = `<!DOCTYPE HTML><html><body>${html}</body></html>`;
@ -283,7 +285,7 @@ Example returns:
 @param {String} html the html of the pad
 @param {String} authorId the id of the author, defaulting to empty string
 */
-exports.setHTML = async (padID: string, html:string|object, authorId = '') => {
+export const setHTML = async (padID: string, html:string|object, authorId = '') => {
  // html string is required
  if (typeof html !== 'string') {
    throw new CustomError('html is not a string', 'apierror');
@ -294,13 +296,13 @@ exports.setHTML = async (padID: string, html:string|object, authorId = '') => {
  // add a new changeset with the new html to the pad
  try {
-    await importHtml.setPadHTML(pad, cleanText(html), authorId);
+    await setPadHTML(pad, cleanText(html), authorId);
  } catch (e) {
    throw new CustomError('HTML is malformed', 'apierror');
  }
  // update the clients on the pad
-  padMessageHandler.updatePadClients(pad);
+  await padMessageHandler.updatePadClients(pad);
 };
 /* ****************
@ -324,7 +326,7 @@ Example returns:
 @param {Number} start the start point of the chat-history
 @param {Number} end the end point of the chat-history
 */
-exports.getChatHistory = async (padID: string, start:number, end:number) => {
+export const getChatHistory = async (padID: string, start:number, end:number) => {
  if (start && end) {
    if (start < 0) {
      throw new CustomError('start is below zero', 'apierror');
@ -374,7 +376,7 @@ Example returns:
 @param {String} authorID the id of the author
 @param {Number} time the timestamp of the chat-message
 */
-exports.appendChatMessage = async (padID: string, text: string|object, authorID: string, time: number) => {
+export const appendChatMessage = async (padID: string, text: string|object, authorID: string, time: number) => {
  // text is required
  if (typeof text !== 'string') {
    throw new CustomError('text is not a string', 'apierror');
@ -404,7 +406,7 @@ Example returns:
 {code: 1, message:"padID does not exist", data: null}
 @param {String} padID the id of the pad
 */
-exports.getRevisionsCount = async (padID: string) => {
+export const getRevisionsCount = async (padID: string) => {
  // get the pad
  const pad = await getPadSafe(padID, true);
  return {revisions: pad.getHeadRevisionNumber()};
@ -419,7 +421,7 @@ Example returns:
 {code: 1, message:"padID does not exist", data: null}
 @param {String} padID the id of the pad
 */
-exports.getSavedRevisionsCount = async (padID: string) => {
+export const getSavedRevisionsCount = async (padID: string) => {
  // get the pad
  const pad = await getPadSafe(padID, true);
  return {savedRevisions: pad.getSavedRevisionsNumber()};
@ -434,7 +436,7 @@ Example returns:
 {code: 1, message:"padID does not exist", data: null}
 @param {String} padID the id of the pad
 */
-exports.listSavedRevisions = async (padID: string) => {
+export const listSavedRevisions = async (padID: string) => {
  // get the pad
  const pad = await getPadSafe(padID, true);
  return {savedRevisions: pad.getSavedRevisionsList()};
@ -450,7 +452,7 @@ Example returns:
    @param {String} padID the id of the pad
     @param {Number} rev the revision number, defaulting to the latest revision
 */
-exports.saveRevision = async (padID: string, rev: number) => {
+export const saveRevision = async (padID: string, rev: number) => {
  // check if rev is a number
  if (rev !== undefined) {
    rev = checkValidRev(rev);
@ -483,7 +485,7 @@ Example returns:
    @param {String} padID the id of the pad
 @return {Promise<{lastEdited: number}>} the timestamp of the last revision of the pad
 */
-exports.getLastEdited = async (padID: string): Promise<{ lastEdited: number; }> => {
+export const getLastEdited = async (padID: string): Promise<{ lastEdited: number; }> => {
  // get the pad
  const pad = await getPadSafe(padID, true);
  const lastEdited = await pad.getLastEdit();
@ -501,7 +503,7 @@ Example returns:
    @param {String} text the initial text of the pad
     @param {String} authorId the id of the author, defaulting to empty string
 */
-exports.createPad = async (padID: string, text: string, authorId = '') => {
+export const createPad = async (padID: string, text: string, authorId = '') => {
  if (padID) {
    // ensure there is no $ in the padID
    if (padID.indexOf('$') !== -1) {
@ -527,7 +529,7 @@ Example returns:
 {code: 1, message:"padID does not exist", data: null}
 @param {String} padID the id of the pad
 */
-exports.deletePad = async (padID: string) => {
+export const deletePad = async (padID: string) => {
  const pad = await getPadSafe(padID, true);
  await pad.remove();
 };
@ -543,7 +545,7 @@ exports.deletePad = async (padID: string) => {
 @param {Number} rev the revision number, defaulting to the latest revision
 @param {String} authorId the id of the author, defaulting to empty string
 */
-exports.restoreRevision = async (padID: string, rev: number, authorId = '') => {
+export const restoreRevision = async (padID: string, rev: number, authorId = '') => {
  // check if rev is a number
  if (rev === undefined) {
    throw new CustomError('rev is not defined', 'apierror');
@ -563,11 +565,11 @@ exports.restoreRevision = async (padID: string, rev: number, authorId = '') => {
  const oldText = pad.text();
  atext.text += '\n';
-  const eachAttribRun = (attribs: string[], func:Function) => {
+  const eachAttribRun = (attribs: string, func:Function) => {
    let textIndex = 0;
    const newTextStart = 0;
    const newTextEnd = atext.text.length;
-    for (const op of Changeset.deserializeOps(attribs)) {
+    for (const op of deserializeOps(attribs)) {
      const nextIndex = textIndex + op.chars;
      if (!(nextIndex <= newTextStart || textIndex >= newTextEnd)) {
        func(Math.max(newTextStart, textIndex), Math.min(newTextEnd, nextIndex), op.attribs);
@ -577,10 +579,10 @@ exports.restoreRevision = async (padID: string, rev: number, authorId = '') => {
  };
  // create a new changeset with a helper builder object
-  const builder = Changeset.builder(oldText.length);
+  const builder = new Builder(oldText.length);
  // assemble each line into the builder
-  eachAttribRun(atext.attribs, (start: number, end: number, attribs:string[]) => {
+  eachAttribRun(atext.attribs, (start: number, end: number, attribs: Attribute[]) => {
    builder.insert(atext.text.substring(start, end), attribs);
  });
@ -588,7 +590,7 @@ exports.restoreRevision = async (padID: string, rev: number, authorId = '') => {
  if (lastNewlinePos < 0) {
    builder.remove(oldText.length - 1, 0);
  } else {
-    builder.remove(lastNewlinePos, oldText.match(/\n/g).length - 1);
+    builder.remove(lastNewlinePos, oldText.match(/\n/g)!.length - 1);
    builder.remove(oldText.length - lastNewlinePos - 1, 0);
  }
@ -610,7 +612,7 @@ Example returns:
 @param {String} destinationID the id of the destination pad
 @param {Boolean} force whether to overwrite the destination pad if it exists
 */
-exports.copyPad = async (sourceID: string, destinationID: string, force: boolean) => {
+export const copyPad = async (sourceID: string, destinationID: string, force: boolean) => {
  const pad = await getPadSafe(sourceID, true);
  await pad.copy(destinationID, force);
 };
@ -628,7 +630,7 @@ Example returns:
 @param {Boolean} force whether to overwrite the destination pad if it exists
 @param {String} authorId the id of the author, defaulting to empty string
 */
-exports.copyPadWithoutHistory = async (sourceID: string, destinationID: string, force:boolean, authorId = '') => {
+export const copyPadWithoutHistory = async (sourceID: string, destinationID: string, force:boolean, authorId: string = '') => {
  const pad = await getPadSafe(sourceID, true);
  await pad.copyPadWithoutHistory(destinationID, force, authorId);
 };
@ -645,7 +647,7 @@ Example returns:
 @param {String} destinationID the id of the destination pad
 @param {Boolean} force whether to overwrite the destination pad if it exists
 */
-exports.movePad = async (sourceID: string, destinationID: string, force:boolean) => {
+export const movePad = async (sourceID: string, destinationID: string, force:boolean) => {
  const pad = await getPadSafe(sourceID, true);
  await pad.copy(destinationID, force);
  await pad.remove();
@ -660,12 +662,12 @@ Example returns:
 {code: 1, message:"padID does not exist", data: null}
 @param {String} padID the id of the pad
 */
-exports.getReadOnlyID = async (padID: string) => {
+export const getReadOnlyID = async (padID: string) => {
  // we don't need the pad object, but this function does all the security stuff for us
  await getPadSafe(padID, true);
  // get the readonlyId
-  const readOnlyID = await readOnlyManager.getReadOnlyId(padID);
+  const readOnlyID = await getReadOnlyId(padID);
  return {readOnlyID};
 };
@ -679,9 +681,9 @@ Example returns:
 {code: 1, message:"padID does not exist", data: null}
    @param {String} roID the readonly id of the pad
 */
-exports.getPadID = async (roID: string) => {
+export const getPadID = async (roID: string) => {
  // get the PadId
-  const padID = await readOnlyManager.getPadId(roID);
+  const padID = await getPadId(roID);
  if (padID == null) {
    throw new CustomError('padID does not exist', 'apierror');
  }
@ -699,7 +701,7 @@ Example returns:
    @param {String} padID the id of the pad
     @param {Boolean} publicStatus the public status of the pad
 */
-exports.setPublicStatus = async (padID: string, publicStatus: boolean|string) => {
+export const setPublicStatus = async (padID: string, publicStatus: boolean|string) => {
  // ensure this is a group pad
  checkGroupPad(padID, 'publicStatus');
@ -723,7 +725,7 @@ Example returns:
 {code: 1, message:"padID does not exist", data: null}
     @param {String} padID the id of the pad
 */
-exports.getPublicStatus = async (padID: string) => {
+export const getPublicStatus = async (padID: string) => {
  // ensure this is a group pad
  checkGroupPad(padID, 'publicStatus');
@ -741,7 +743,7 @@ Example returns:
 {code: 1, message:"padID does not exist", data: null}
     @param {String} padID the id of the pad
 */
-exports.listAuthorsOfPad = async (padID: string) => {
+export const listAuthorsOfPad = async (padID: string) => {
  // get the pad
  const pad = await getPadSafe(padID, true);
  const authorIDs = pad.getAllAuthors();
@ -773,7 +775,7 @@ Example returns:
     @param {String} msg the message to send
 */
-exports.sendClientsMessage = async (padID: string, msg: string) => {
+export const sendClientsMessage = async (padID: string, msg: string) => {
  await getPadSafe(padID, true); // Throw if the padID is invalid or if the pad does not exist.
  padMessageHandler.handleCustomMessage(padID, msg);
 };
@ -786,7 +788,7 @@ Example returns:
 {"code":0,"message":"ok","data":null}
 {"code":4,"message":"no or wrong API Key","data":null}
 */
-exports.checkToken = async () => {
+export const checkToken = async () => {
 };
 /**
@ -799,7 +801,7 @@ Example returns:
     @param {String} padID the id of the pad
     @return {Promise<{chatHead: number}>} the chatHead of the pad
 */
-exports.getChatHead = async (padID:string): Promise<{ chatHead: number; }> => {
+export const getChatHead = async (padID:string): Promise<{ chatHead: number; }> => {
  // get the pad
  const pad = await getPadSafe(padID, true);
  return {chatHead: pad.chatHead};
@ -825,7 +827,7 @@ Example returns:
 @param {Number} startRev the start revision number
 @param {Number} endRev the end revision number
 */
-exports.createDiffHTML = async (padID: string, startRev: number, endRev: number) => {
+export const createDiffHTML = async (padID: string, startRev: number, endRev: number) => {
  // check if startRev is a number
  if (startRev !== undefined) {
    startRev = checkValidRev(startRev);
@ -901,7 +903,7 @@ const getPadSafe = async (padID: string|object, shouldExist: boolean, text?:stri
  }
  // check if the pad exists
-  const exists = await padManager.doesPadExists(padID);
+  const exists = await padManager.doesPadExist(padID);
  if (!exists && shouldExist) {
    // does not exist, but should
--- a/src/node/db/AuthorManager.ts
+++ b/src/node/db/AuthorManager.ts
@ -19,12 +19,12 @@
 * limitations under the License.
 */
-const db = require('./DB');
+import {get, getSub, set, setSub} from './DB';
-const CustomError = require('../utils/customError');
+import CustomError from '../utils/customError';
-const hooks = require('../../static/js/pluginfw/hooks.js');
+import {aCallFirst} from '../../static/js/pluginfw/hooks';
 import {padUtils, randomString} from '../../static/js/pad_utils'
-exports.getColorPalette = () => [
+export const getColorPalette = () => [
  '#ffc7c7',
  '#fff1c7',
  '#e3ffc7',
@ -95,8 +95,8 @@ exports.getColorPalette = () => [
 * Checks if the author exists
 * @param {String} authorID The id of the author
 */
-exports.doesAuthorExist = async (authorID: string) => {
+export const doesAuthorExist = async (authorID: string) => {
-  const author = await db.get(`globalAuthor:${authorID}`);
+  const author = await get(`globalAuthor:${authorID}`);
  return author != null;
 };
@ -105,7 +105,6 @@ exports.doesAuthorExist = async (authorID: string) => {
 exported for backwards compatibility
 @param {String} authorID The id of the author
  */
 exports.doesAuthorExists = exports.doesAuthorExist;
 /**
@ -116,14 +115,14 @@ exports.doesAuthorExists = exports.doesAuthorExist;
 */
 const mapAuthorWithDBKey = async (mapperkey: string, mapper:string) => {
  // try to map to an author
-  const author = await db.get(`${mapperkey}:${mapper}`);
+  const author = await get(`${mapperkey}:${mapper}`);
  if (author == null) {
    // there is no author with this mapper, so create one
    const author = await exports.createAuthor(null);
    // create the token2author relation
-    await db.set(`${mapperkey}:${mapper}`, author.authorID);
+    await set(`${mapperkey}:${mapper}`, author.authorID);
    // return the author
    return author;
@ -131,7 +130,8 @@ const mapAuthorWithDBKey = async (mapperkey: string, mapper:string) => {
  // there is an author with this mapper
  // update the timestamp of this author
-  await db.setSub(`globalAuthor:${author}`, ['timestamp'], Date.now());
+  // @ts-ignore
  await db!.setSub(`globalAuthor:${author}`, ['timestamp'], Date.now());
  // return the author
  return {authorID: author};
@ -142,7 +142,7 @@ const mapAuthorWithDBKey = async (mapperkey: string, mapper:string) => {
 * @param {String} token The token of the author
 * @return {Promise<string|*|{authorID: string}|{authorID: *}>}
 */
-const getAuthor4Token = async (token: string) => {
+const _getAuthor4Token = async (token: string) => {
  const author = await mapAuthorWithDBKey('token2author', token);
  // return only the sub value authorID
@ -155,9 +155,9 @@ const getAuthor4Token = async (token: string) => {
 * @param {Object} user
 * @return {Promise<*>}
 */
-exports.getAuthorId = async (token: string, user: object) => {
+export const getAuthorId = async (token: string, user: object) => {
  const context = {dbKey: token, token, user};
-  let [authorId] = await hooks.aCallFirst('getAuthorId', context);
+  let [authorId] = await aCallFirst('getAuthorId', context);
  if (!authorId) authorId = await getAuthor4Token(context.dbKey);
  return authorId;
 };
@ -168,10 +168,10 @@ exports.getAuthorId = async (token: string, user: object) => {
 * @deprecated Use `getAuthorId` instead.
 * @param {String} token The token
 */
-exports.getAuthor4Token = async (token: string) => {
+export const getAuthor4Token = async (token: string) => {
  padUtils.warnDeprecated(
      'AuthorManager.getAuthor4Token() is deprecated; use AuthorManager.getAuthorId() instead');
-  return await getAuthor4Token(token);
+  return await _getAuthor4Token(token);
 };
 /**
@ -179,12 +179,12 @@ exports.getAuthor4Token = async (token: string) => {
 * @param {String} authorMapper The mapper
 * @param {String} name The name of the author (optional)
 */
-exports.createAuthorIfNotExistsFor = async (authorMapper: string, name: string) => {
+export const createAuthorIfNotExistsFor = async (authorMapper: string, name: string) => {
  const author = await mapAuthorWithDBKey('mapper2author', authorMapper);
  if (name) {
    // set the name of this author
-    await exports.setAuthorName(author.authorID, name);
+    await setAuthorName(author.authorID, name);
  }
  return author;
@ -195,19 +195,20 @@ exports.createAuthorIfNotExistsFor = async (authorMapper: string, name: string)
 * Internal function that creates the database entry for an author
 * @param {String} name The name of the author
 */
-exports.createAuthor = async (name: string) => {
+export const createAuthor = async (name: string) => {
  // create the new author name
  const author = `a.${randomString(16)}`;
  // create the globalAuthors db entry
  const authorObj = {
-    colorId: Math.floor(Math.random() * (exports.getColorPalette().length)),
+    colorId: Math.floor(Math.random() * (getColorPalette().length)),
    name,
    timestamp: Date.now(),
  };
  // set the global author db entry
-  await db.set(`globalAuthor:${author}`, authorObj);
+  // @ts-ignore
  await db!.set(`globalAuthor:${author}`, authorObj);
  return {authorID: author};
 };
@ -216,48 +217,49 @@ exports.createAuthor = async (name: string) => {
 * Returns the Author Obj of the author
 * @param {String} author The id of the author
 */
-exports.getAuthor = async (author: string) => await db.get(`globalAuthor:${author}`);
+export const getAuthor = async (author: string) => await get(`globalAuthor:${author}`);
 /**
 * Returns the color Id of the author
 * @param {String} author The id of the author
 */
-exports.getAuthorColorId = async (author: string) => await db.getSub(`globalAuthor:${author}`, ['colorId']);
+export const getAuthorColorId = async (author: string) => await getSub(`globalAuthor:${author}`, ['colorId']) as number;
 /**
 * Sets the color Id of the author
 * @param {String} author The id of the author
 * @param {String} colorId The color id of the author
 */
-exports.setAuthorColorId = async (author: string, colorId: string) => await db.setSub(
+export const setAuthorColorId = async (author: string, colorId: string) => await setSub(
-    `globalAuthor:${author}`, ['colorId'], colorId);
+  // @ts-ignore
  `globalAuthor:${author}`, ['colorId'], colorId);
 /**
 * Returns the name of the author
 * @param {String} author The id of the author
 */
-exports.getAuthorName = async (author: string) => await db.getSub(`globalAuthor:${author}`, ['name']);
+export const getAuthorName = async (author: string) => await getSub(`globalAuthor:${author}`, ['name']);
 /**
 * Sets the name of the author
 * @param {String} author The id of the author
 * @param {String} name The name of the author
 */
-exports.setAuthorName = async (author: string, name: string) => await db.setSub(
+export const setAuthorName = async (author: string, name: string) => await setSub(
    `globalAuthor:${author}`, ['name'], name);
 /**
 * Returns an array of all pads this author contributed to
 * @param {String} authorID The id of the author
 */
-exports.listPadsOfAuthor = async (authorID: string) => {
+export const listPadsOfAuthor = async (authorID: string) => {
  /* There are two other places where this array is manipulated:
   * (1) When the author is added to a pad, the author object is also updated
   * (2) When a pad is deleted, each author of that pad is also updated
   */
  // get the globalAuthor
-  const author = await db.get(`globalAuthor:${authorID}`);
+  const author = await get(`globalAuthor:${authorID}`);
  if (author == null) {
    // author does not exist
@ -275,9 +277,9 @@ exports.listPadsOfAuthor = async (authorID: string) => {
 * @param {String} authorID The id of the author
 * @param {String} padID The id of the pad the author contributes to
 */
-exports.addPad = async (authorID: string, padID: string) => {
+export const addPad = async (authorID: string, padID: string) => {
  // get the entry
-  const author = await db.get(`globalAuthor:${authorID}`);
+  const author = await get(`globalAuthor:${authorID}`);
  if (author == null) return;
@ -294,7 +296,7 @@ exports.addPad = async (authorID: string, padID: string) => {
  author.padIDs[padID] = 1; // anything, because value is not used
  // save the new element back
-  await db.set(`globalAuthor:${authorID}`, author);
+  await set(`globalAuthor:${authorID}`, author);
 };
 /**
@ -302,14 +304,14 @@ exports.addPad = async (authorID: string, padID: string) => {
 * @param {String} authorID The id of the author
 * @param {String} padID The id of the pad the author contributes to
 */
-exports.removePad = async (authorID: string, padID: string) => {
+export const removePad = async (authorID: string, padID?: string) => {
-  const author = await db.get(`globalAuthor:${authorID}`);
+  const author = await get(`globalAuthor:${authorID}`);
  if (author == null) return;
  if (author.padIDs != null) {
    // remove pad from author
-    delete author.padIDs[padID];
+    delete author.padIDs[padID!];
-    await db.set(`globalAuthor:${authorID}`, author);
+    await set(`globalAuthor:${authorID}`, author);
  }
 };
--- a/src/node/db/DB.ts
+++ b/src/node/db/DB.ts
@ -24,37 +24,66 @@
 import ueberDB from 'ueberdb2';
 const settings = require('../utils/Settings');
 import log4js from 'log4js';
-const stats = require('../stats')
+import {measuredCollection} from '../stats';
 const logger = log4js.getLogger('ueberDB');
 /**
 * The UeberDB Object that provides the database functions
 */
-exports.db = null;
+let db: ueberDB.Database|null = null;
 /**
 * Initializes the database with the settings provided by the settings module
 */
-exports.init = async () => {
+export const init = async () => {
-  exports.db = new ueberDB.Database(settings.dbType, settings.dbSettings, null, logger);
+  db = new ueberDB.Database(settings.dbType, settings.dbSettings, null, logger);
-  await exports.db.init();
+  await db.init();
-  if (exports.db.metrics != null) {
+  if (db.metrics != null) {
-    for (const [metric, value] of Object.entries(exports.db.metrics)) {
+    for (const [metric, value] of Object.entries(db.metrics)) {
      if (typeof value !== 'number') continue;
-      stats.gauge(`ueberdb_${metric}`, () => exports.db.metrics[metric]);
+      measuredCollection.gauge(`ueberdb_${metric}`, () => db!.metrics[metric]);
    }
  }
-  for (const fn of ['get', 'set', 'findKeys', 'getSub', 'setSub', 'remove']) {
+}
    const f = exports.db[fn];
    exports[fn] = async (...args:string[]) => await f.call(exports.db, ...args);
    Object.setPrototypeOf(exports[fn], Object.getPrototypeOf(f));
    Object.defineProperties(exports[fn], Object.getOwnPropertyDescriptors(f));
  }
 };
-exports.shutdown = async (hookName: string, context:any) => {
+export const get = async (key: string) => {
  if (db == null) throw new Error('Database not initialized');
  return await db.get(key);
 }
 export const set = async (key: string, value: any) => {
  if (db == null) throw new Error('Database not initialized');
  return await db.set(key, value);
 }
 export const findKeys = async (key: string, notKey:string|null, callback?: Function) => {
  if (db == null) throw new Error('Database not initialized');
  // @ts-ignore
  return await db.findKeys(key, notKey, callback as any);
 }
 export const getSub = async (key: string, field: string[], callback?: Function) => {
  if (db == null) throw new Error('Database not initialized');
  // @ts-ignore
  return await db.getSub(key, field, callback as any);
 }
 export const setSub = async (key: string, field: string[], value: any, callback?: any, deprecated?: any) => {
  if (db == null) throw new Error('Database not initialized');
  // @ts-ignore
  return await db.setSub(key, field, value, callback, deprecated);
 }
 export const remove = async (key: string, callback?: null) => {
  if (db == null) throw new Error('Database not initialized');
  return await db.remove(key, callback);
 }
 export const shutdown = async (hookName: string, context:any) => {
  if (exports.db != null) await exports.db.close();
  exports.db = null;
  logger.log('Database closed');
 };
--- a/src/node/db/GroupManager.ts
+++ b/src/node/db/GroupManager.ts
@ -19,18 +19,18 @@
 * limitations under the License.
 */
-const CustomError = require('../utils/customError');
+import CustomError from '../utils/customError';
 const randomString = require('../../static/js/pad_utils').randomString;
-const db = require('./DB');
+import {get, getSub, remove, set, setSub} from './DB';
-const padManager = require('./PadManager');
+import {doesPadExist, getPad} from './PadManager';
-const sessionManager = require('./SessionManager');
+import {deleteSession} from './SessionManager';
 /**
 * Lists all groups
 * @return {Promise<{groupIDs: string[]}>} The ids of all groups
 */
-exports.listAllGroups = async () => {
+export const listAllGroups = async (): Promise<{ groupIDs: string[]; }> => {
-  let groups = await db.get('groups');
+  let groups = await get('groups');
  groups = groups || {};
  const groupIDs = Object.keys(groups);
@ -42,8 +42,8 @@ exports.listAllGroups = async () => {
 * @param {String} groupID The id of the group
 * @return {Promise<void>} Resolves when the group is deleted
 */
-exports.deleteGroup = async (groupID: string): Promise<void> => {
+export const deleteGroup = async (groupID: string): Promise<void> => {
-  const group = await db.get(`group:${groupID}`);
+  const group = await get(`group:${groupID}`);
  // ensure group exists
  if (group == null) {
@ -53,28 +53,28 @@ exports.deleteGroup = async (groupID: string): Promise<void> => {
  // iterate through all pads of this group and delete them (in parallel)
  await Promise.all(Object.keys(group.pads).map(async (padId) => {
-    const pad = await padManager.getPad(padId);
+    const pad = await getPad(padId);
    await pad.remove();
  }));
  // Delete associated sessions in parallel. This should be done before deleting the group2sessions
  // record because deleting a session updates the group2sessions record.
-  const {sessionIDs = {}} = await db.get(`group2sessions:${groupID}`) || {};
+  const {sessionIDs = {}} = await get(`group2sessions:${groupID}`) || {};
  await Promise.all(Object.keys(sessionIDs).map(async (sessionId) => {
-    await sessionManager.deleteSession(sessionId);
+    await deleteSession(sessionId);
  }));
  await Promise.all([
-    db.remove(`group2sessions:${groupID}`),
+    remove(`group2sessions:${groupID}`),
    // UeberDB's setSub() method atomically reads the record, updates the appropriate property, and
    // writes the result. Setting a property to `undefined` deletes that property (JSON.stringify()
    // ignores such properties).
-    db.setSub('groups', [groupID], undefined),
+    setSub('groups', [groupID], undefined),
-    ...Object.keys(group.mappings || {}).map(async (m) => await db.remove(`mapper2group:${m}`)),
+    ...Object.keys(group.mappings || {}).map(async (m) => await remove(`mapper2group:${m}`)),
  ]);
  // Remove the group record after updating the `groups` record so that the state is consistent.
-  await db.remove(`group:${groupID}`);
+  await remove(`group:${groupID}`);
 };
 /**
@ -82,9 +82,9 @@ exports.deleteGroup = async (groupID: string): Promise<void> => {
 * @param {String} groupID the id of the group to delete
 * @return {Promise<boolean>} Resolves to true if the group exists
 */
-exports.doesGroupExist = async (groupID: string) => {
+export const doesGroupExist = async (groupID: string) => {
  // try to get the group entry
-  const group = await db.get(`group:${groupID}`);
+  const group = await get(`group:${groupID}`);
  return (group != null);
 };
@ -93,13 +93,13 @@ exports.doesGroupExist = async (groupID: string) => {
 * Creates a new group
 * @return {Promise<{groupID: string}>} the id of the new group
 */
-exports.createGroup = async () => {
+export const createGroup = async (): Promise<{ groupID: string; }> => {
  const groupID = `g.${randomString(16)}`;
-  await db.set(`group:${groupID}`, {pads: {}, mappings: {}});
+  await set(`group:${groupID}`, {pads: {}, mappings: {}});
  // Add the group to the `groups` record after the group's individual record is created so that
  // the state is consistent. Note: UeberDB's setSub() method atomically reads the record, updates
  // the appropriate property, and writes the result.
-  await db.setSub('groups', [groupID], 1);
+  await setSub('groups', [groupID], 1);
  return {groupID};
 };
@ -108,20 +108,20 @@ exports.createGroup = async () => {
 * @param groupMapper the mapper of the group
 * @return {Promise<{groupID: string}|{groupID: *}>} a promise that resolves to the group ID
 */
-exports.createGroupIfNotExistsFor = async (groupMapper: string|object) => {
+export const createGroupIfNotExistsFor = async (groupMapper: string|object) => {
  if (typeof groupMapper !== 'string') {
    throw new CustomError('groupMapper is not a string', 'apierror');
  }
-  const groupID = await db.get(`mapper2group:${groupMapper}`);
+  const groupID = await get(`mapper2group:${groupMapper}`) as string;
-  if (groupID && await exports.doesGroupExist(groupID)) return {groupID};
+  if (groupID && await doesGroupExist(groupID)) return {groupID};
-  const result = await exports.createGroup();
+  const result = await createGroup();
  await Promise.all([
-    db.set(`mapper2group:${groupMapper}`, result.groupID),
+    set(`mapper2group:${groupMapper}`, result.groupID),
    // Remember the mapping in the group record so that it can be cleaned up when the group is
    // deleted. Although the core Etherpad API does not support multiple mappings for the same
    // group, the database record does support multiple mappings in case a plugin decides to extend
    // the core Etherpad functionality. (It's also easy to implement it this way.)
-    db.setSub(`group:${result.groupID}`, ['mappings', groupMapper], 1),
+    setSub(`group:${result.groupID}`, ['mappings', groupMapper], 1),
  ]);
  return result;
 };
@ -134,19 +134,19 @@ exports.createGroupIfNotExistsFor = async (groupMapper: string|object) => {
 * @param {String} authorId The id of the author
 * @return {Promise<{padID: string}>} a promise that resolves to the id of the new pad
 */
-exports.createGroupPad = async (groupID: string, padName: string, text: string, authorId: string = ''): Promise<{ padID: string; }> => {
+export const createGroupPad = async (groupID: string, padName: string, text: string, authorId: string = ''): Promise<{ padID: string; }> => {
  // create the padID
  const padID = `${groupID}$${padName}`;
  // ensure group exists
-  const groupExists = await exports.doesGroupExist(groupID);
+  const groupExists = await doesGroupExist(groupID);
  if (!groupExists) {
    throw new CustomError('groupID does not exist', 'apierror');
  }
  // ensure pad doesn't exist already
-  const padExists = await padManager.doesPadExists(padID);
+  const padExists = await doesPadExist(padID);
  if (padExists) {
    // pad exists already
@ -154,10 +154,10 @@ exports.createGroupPad = async (groupID: string, padName: string, text: string,
  }
  // create the pad
-  await padManager.getPad(padID, text, authorId);
+  await getPad(padID, text, authorId);
  // create an entry in the group for this pad
-  await db.setSub(`group:${groupID}`, ['pads', padID], 1);
+  await setSub(`group:${groupID}`, ['pads', padID], 1);
  return {padID};
 };
@ -167,8 +167,8 @@ exports.createGroupPad = async (groupID: string, padName: string, text: string,
 * @param {String} groupID The id of the group
 * @return {Promise<{padIDs: string[]}>} a promise that resolves to the ids of all pads of the group
 */
-exports.listPads = async (groupID: string): Promise<{ padIDs: string[]; }> => {
+export const listPads = async (groupID: string): Promise<{ padIDs: string[]; }> => {
-  const exists = await exports.doesGroupExist(groupID);
+  const exists = await doesGroupExist(groupID);
  // ensure the group exists
  if (!exists) {
@ -176,7 +176,7 @@ exports.listPads = async (groupID: string): Promise<{ padIDs: string[]; }> => {
  }
  // group exists, let's get the pads
-  const result = await db.getSub(`group:${groupID}`, ['pads']);
+  const result = await getSub(`group:${groupID}`, ['pads']);
  const padIDs = Object.keys(result);
  return {padIDs};
--- a/src/node/db/Pad.ts
+++ b/src/node/db/Pad.ts
@ -8,23 +8,26 @@ import {MapArrayType} from "../types/MapType";
 */
 import AttributeMap from '../../static/js/AttributeMap';
-const Changeset = require('../../static/js/Changeset');
+import {applyToAText, checkRep, copyAText, deserializeOps, makeAText, makeSplice, opsFromAText, pack, unpack} from '../../static/js/Changeset';
-const ChatMessage = require('../../static/js/ChatMessage');
+import ChatMessage from '../../static/js/ChatMessage';
 import AttributePool from '../../static/js/AttributePool';
-const Stream = require('../utils/Stream');
+import Stream from '../utils/Stream';
 const assert = require('assert').strict;
-const db = require('./DB');
+import {get, set, setSub, remove} from './DB';
 const settings = require('../utils/Settings');
-const authorManager = require('./AuthorManager');
+import {addPad, getAuthorColorId, getAuthorName, getColorPalette, removePad} from './AuthorManager';
-const padManager = require('./PadManager');
+import {doesPadExist, getPad} from './PadManager';
-const padMessageHandler = require('../handler/PadMessageHandler');
+import {kickSessionsFromPad} from '../handler/PadMessageHandler';
-const groupManager = require('./GroupManager');
+import {doesGroupExist} from './GroupManager';
-const CustomError = require('../utils/customError');
+import CustomError from '../utils/customError';
-const readOnlyManager = require('./ReadOnlyManager');
+import {getReadOnlyId} from './ReadOnlyManager';
-const randomString = require('../utils/randomstring');
+import {randomString} from '../utils/randomstring';
-const hooks = require('../../static/js/pluginfw/hooks');
+import {aCallAll} from '../../static/js/pluginfw/hooks';
 import {padUtils} from "../../static/js/pad_utils";
-const promises = require('../utils/promises');
+import {PadRevision} from "../../static/js/types/PadRevision";
 import {} from '../utils/promises';
 import {SmartOpAssembler} from "../../static/js/SmartOpAssembler";
 import {timesLimit} from "async";
 /**
 * Copied from the Etherpad source code. It converts Windows line breaks to Unix
@ -32,19 +35,18 @@ const promises = require('../utils/promises');
 * @param {String} txt The text to clean
 * @returns {String} The cleaned text
 */
-exports.cleanText = (txt:string): string => txt.replace(/\r\n/g, '\n')
+export const cleanText = (txt:string): string => txt.replace(/\r\n/g, '\n')
    .replace(/\r/g, '\n')
    .replace(/\t/g, '        ')
    .replace(/\xa0/g, ' ');
 class Pad {
-  private db: Database;
+  atext: AText;
-  private atext: AText;
+  pool: AttributePool;
-  private pool: AttributePool;
+  head: number;
-  private head: number;
+    chatHead: number;
    private chatHead: number;
    private publicStatus: boolean;
-    private id: string;
+    id: string;
    private savedRevisions: any[];
  /**
   * @param id
@ -54,9 +56,8 @@ class Pad {
   *     can be used to shard pad storage across multiple database backends, to put each pad in its
   *     own database table, or to validate imported pad data before it is written to the database.
   */
-  constructor(id:string, database = db) {
+  constructor(id:string) {
-    this.db = database;
+    this.atext = makeAText('\n');
    this.atext = Changeset.makeAText('\n');
    this.pool = new AttributePool();
    this.head = -1;
    this.chatHead = -1;
@ -93,13 +94,13 @@ class Pad {
   * @param {String} authorId The id of the author
   * @return {Promise<number|string>}
   */
-  async appendRevision(aChangeset:AChangeSet, authorId = '') {
+  async appendRevision(aChangeset:string, authorId: string = ''): Promise<number | string> {
-    const newAText = Changeset.applyToAText(aChangeset, this.atext, this.pool);
+    const newAText = applyToAText(aChangeset, this.atext, this.pool);
    if (newAText.text === this.atext.text && newAText.attribs === this.atext.attribs &&
        this.head !== -1) {
      return this.head;
    }
-    Changeset.copyAText(newAText, this.atext);
+    copyAText(newAText, this.atext);
    const newRev = ++this.head;
@ -121,16 +122,17 @@ class Pad {
        },
      }),
      this.saveToDatabase(),
-      authorId && authorManager.addPad(authorId, this.id),
+      authorId && addPad(authorId, this.id),
-      hooks.aCallAll(hook, {
+      aCallAll(hook, {
        pad: this,
        authorId,
        get author() {
          padUtils.warnDeprecated(`${hook} hook author context is deprecated; use authorId instead`);
-          return this.authorId;
+          return authorId;
        },
        set author(authorId) {
          padUtils.warnDeprecated(`${hook} hook author context is deprecated; use authorId instead`);
          // @ts-ignore
          this.authorId = authorId;
        },
        ...this.head === 0 ? {} : {
@ -192,8 +194,8 @@ class Pad {
   * Returns all authors that worked on this pad
   * @return {[String]} The id of authors who contributed to this pad
   */
-  getAllAuthors() {
+  getAllAuthors(): string[] {
-    const authorIds = [];
+    const authorIds: string[] = [];
    for (const key in this.pool.numToAttrib) {
      if (this.pool.numToAttrib[key][0] === 'author' && this.pool.numToAttrib[key][1] !== '') {
@ -215,22 +217,23 @@ class Pad {
    ]);
    const apool = this.apool();
    let atext = keyAText;
-    for (const cs of changesets) atext = Changeset.applyToAText(cs, atext, apool);
+    for (const cs of changesets) atext = applyToAText(cs, atext, apool);
    return atext;
  }
  async getRevision(revNum: number) {
-    return await this.db.get(`pad:${this.id}:revs:${revNum}`);
+    return await get(`pad:${this.id}:revs:${revNum}`);
  }
  async getAllAuthorColors() {
    const authorIds = this.getAllAuthors();
-    const returnTable:MapArrayType<string> = {};
+    const returnTable:MapArrayType<number> = {};
-    const colorPalette = authorManager.getColorPalette();
+    const colorPalette = getColorPalette();
    await Promise.all(
-        authorIds.map((authorId) => authorManager.getAuthorColorId(authorId).then((colorId:string) => {
+        authorIds.map((authorId) => getAuthorColorId(authorId).then((colorId) => {
          // colorId might be a hex color or an number out of the palette
          // @ts-ignore
          returnTable[authorId] = colorPalette[colorId] || colorId;
        })));
@ -293,7 +296,7 @@ class Pad {
        (!ins && start > 0 && orig[start - 1] === '\n');
    if (!willEndWithNewline) ins += '\n';
    if (ndel === 0 && ins.length === 0) return;
-    const changeset = Changeset.makeSplice(orig, start, ndel, ins);
+    const changeset = makeSplice(orig, start, ndel, ins);
    await this.appendRevision(changeset, authorId);
  }
@ -316,7 +319,7 @@ class Pad {
   * @param {string} [authorId] - The author ID of the user that initiated the change, if
   *     applicable.
   */
-  async appendText(newText:string, authorId = '') {
+  async appendText(newText:string, authorId: string = '') {
    await this.spliceText(this.text().length - 1, 0, newText, authorId);
  }
@ -330,7 +333,7 @@ class Pad {
   * @param {?number} [time] - Message timestamp (milliseconds since epoch). Deprecated; use
   *     `msgOrText.time` instead.
   */
-  async appendChatMessage(msgOrText: string|typeof ChatMessage, authorId = null, time = null) {
+  async appendChatMessage(msgOrText: string| ChatMessage, authorId = null, time = null) {
    const msg =
          msgOrText instanceof ChatMessage ? msgOrText : new ChatMessage(msgOrText, authorId, time);
    this.chatHead++;
@ -338,6 +341,7 @@ class Pad {
      // Don't save the display name in the database because the user can change it at any time. The
      // `displayName` property will be populated with the current value when the message is read
      // from the database.
      // @ts-ignore
      this.db.set(`pad:${this.id}:chat:${this.chatHead}`, {...msg, displayName: undefined}),
      this.saveToDatabase(),
    ]);
@ -347,11 +351,11 @@ class Pad {
   * @param {number} entryNum - ID of the desired chat message.
   * @returns {?ChatMessage}
   */
-  async getChatMessage(entryNum: number) {
+  async getChatMessage(entryNum: number): Promise<ChatMessage | null> {
-    const entry = await this.db.get(`pad:${this.id}:chat:${entryNum}`);
+    const entry = await get(`pad:${this.id}:chat:${entryNum}`);
    if (entry == null) return null;
    const message = ChatMessage.fromObject(entry);
-    message.displayName = await authorManager.getAuthorName(message.authorId);
+    message.displayName = await getAuthorName(message.authorId!);
    return message;
  }
@ -362,7 +366,7 @@ class Pad {
   *     (inclusive), in order. Note: `start` and `end` form a closed interval, not a half-open
   *     interval as is typical in code.
   */
-  async getChatMessages(start: string, end: number) {
+  async getChatMessages(start: number, end: number) {
    const entries =
        await Promise.all(Stream.range(start, end + 1).map(this.getChatMessage.bind(this)));
@ -378,9 +382,9 @@ class Pad {
    });
  }
-  async init(text:string, authorId = '') {
+  async init(text:string|null, authorId = '') {
    // try to load the pad
-    const value = await this.db.get(`pad:${this.id}`);
+    const value = await get(`pad:${this.id}`);
    // if this pad exists, load it
    if (value != null) {
@ -389,14 +393,14 @@ class Pad {
    } else {
      if (text == null) {
        const context = {pad: this, authorId, type: 'text', content: settings.defaultPadText};
-        await hooks.aCallAll('padDefaultContent', context);
+        await aCallAll('padDefaultContent', context);
        if (context.type !== 'text') throw new Error(`unsupported content type: ${context.type}`);
        text = exports.cleanText(context.content);
      }
-      const firstChangeset = Changeset.makeSplice('\n', 0, 0, text);
+      const firstChangeset = makeSplice('\n', 0, 0, text);
      await this.appendRevision(firstChangeset, authorId);
    }
-    await hooks.aCallAll('padLoad', {pad: this});
+    await aCallAll('padLoad', {pad: this});
  }
  async copy(destinationID: string, force: boolean) {
@ -415,8 +419,8 @@ class Pad {
    await this.removePadIfForceIsTrueAndAlreadyExist(destinationID, force);
    const copyRecord = async (keySuffix: string) => {
-      const val = await this.db.get(`pad:${this.id}${keySuffix}`);
+      const val = await get(`pad:${this.id}${keySuffix}`);
-      await db.set(`pad:${destinationID}${keySuffix}`, val);
+      await set(`pad:${destinationID}${keySuffix}`, val);
    };
    const promises = (function* () {
@ -427,22 +431,24 @@ class Pad {
      yield* Stream.range(0, this.chatHead + 1).map((i) => copyRecord(`:chat:${i}`));
      // @ts-ignore
      yield this.copyAuthorInfoToDestinationPad(destinationID);
-      if (destGroupID) yield db.setSub(`group:${destGroupID}`, ['pads', destinationID], 1);
+      if (destGroupID) yield setSub(`group:${destGroupID}`, ['pads', destinationID], 1);
    }).call(this);
    for (const p of new Stream(promises).batch(100).buffer(99)) await p;
    // Initialize the new pad (will update the listAllPads cache)
-    const dstPad = await padManager.getPad(destinationID, null);
+    const dstPad = await getPad(destinationID, null);
    // let the plugins know the pad was copied
-    await hooks.aCallAll('padCopy', {
+    await aCallAll('padCopy', {
      get originalPad() {
        padUtils.warnDeprecated('padCopy originalPad context property is deprecated; use srcPad instead');
        // @ts-ignore
        return this.srcPad;
      },
      get destinationID() {
        padUtils.warnDeprecated(
            'padCopy destinationID context property is deprecated; use dstPad.id instead');
        // @ts-ignore
        return this.dstPad.id;
      },
      srcPad: this,
@ -457,7 +463,7 @@ class Pad {
    if (destinationID.indexOf('$') >= 0) {
      destGroupID = destinationID.split('$')[0];
-      const groupExists = await groupManager.doesGroupExist(destGroupID);
+      const groupExists = await doesGroupExist(destGroupID);
      // group does not exist
      if (!groupExists) {
@ -469,7 +475,7 @@ class Pad {
  async removePadIfForceIsTrueAndAlreadyExist(destinationID: string, force: boolean|string) {
    // if the pad exists, we should abort, unless forced.
-    const exists = await padManager.doesPadExist(destinationID);
+    const exists = await doesPadExist(destinationID);
    // allow force to be a string
    if (typeof force === 'string') {
@ -485,7 +491,7 @@ class Pad {
      }
      // exists and forcing
-      const pad = await padManager.getPad(destinationID);
+      const pad = await getPad(destinationID);
      await pad.remove();
    }
  }
@ -493,7 +499,7 @@ class Pad {
  async copyAuthorInfoToDestinationPad(destinationID: string) {
    // add the new sourcePad to all authors who contributed to the old one
    await Promise.all(this.getAllAuthors().map(
-        (authorID) => authorManager.addPad(authorID, destinationID)));
+        (authorID) => addPad(authorID, destinationID)));
  }
  async copyPadWithoutHistory(destinationID: string, force: string|boolean, authorId = '') {
@ -510,18 +516,18 @@ class Pad {
    // Group pad? Add it to the group's list
    if (destGroupID) {
-      await db.setSub(`group:${destGroupID}`, ['pads', destinationID], 1);
+      await setSub(`group:${destGroupID}`, ['pads', destinationID], 1);
    }
    // initialize the pad with a new line to avoid getting the defaultText
-    const dstPad = await padManager.getPad(destinationID, '\n', authorId);
+    const dstPad = await getPad(destinationID, '\n', authorId);
    dstPad.pool = this.pool.clone();
    const oldAText = this.atext;
    // based on Changeset.makeSplice
-    const assem = Changeset.smartOpAssembler();
+    const assem = new SmartOpAssembler();
-    for (const op of Changeset.opsFromAText(oldAText)) assem.append(op);
+    for (const op of opsFromAText(oldAText)) assem.append(op);
    assem.endDocument();
    // although we have instantiated the dstPad with '\n', an additional '\n' is
@ -533,17 +539,19 @@ class Pad {
    // create a changeset that removes the previous text and add the newText with
    // all atributes present on the source pad
-    const changeset = Changeset.pack(oldLength, newLength, assem.toString(), newText);
+    const changeset = pack(oldLength, newLength, assem.toString(), newText);
-    dstPad.appendRevision(changeset, authorId);
+    await dstPad.appendRevision(changeset, authorId);
-    await hooks.aCallAll('padCopy', {
+    await aCallAll('padCopy', {
      get originalPad() {
        padUtils.warnDeprecated('padCopy originalPad context property is deprecated; use srcPad instead');
        // @ts-ignore
        return this.srcPad;
      },
      get destinationID() {
        padUtils.warnDeprecated(
            'padCopy destinationID context property is deprecated; use dstPad.id instead');
        // @ts-ignore
        return this.dstPad.id;
      },
      srcPad: this,
@ -558,7 +566,7 @@ class Pad {
    const p = [];
    // kick everyone from this pad
-    padMessageHandler.kickSessionsFromPad(padID);
+    kickSessionsFromPad(padID);
    // delete all relations - the original code used async.parallel but
    // none of the operations except getting the group depended on callbacks
@ -569,41 +577,44 @@ class Pad {
    if (padID.indexOf('$') >= 0) {
      // it is a group pad
      const groupID = padID.substring(0, padID.indexOf('$'));
-      const group = await db.get(`group:${groupID}`);
+      const group = await get(`group:${groupID}`);
      // remove the pad entry
      delete group.pads[padID];
      // set the new value
-      p.push(db.set(`group:${groupID}`, group));
+      p.push(set(`group:${groupID}`, group));
    }
    // remove the readonly entries
-    p.push(readOnlyManager.getReadOnlyId(padID).then(async (readonlyID: string) => {
+    p.push(getReadOnlyId(padID).then(async (readonlyID: string) => {
-      await db.remove(`readonly2pad:${readonlyID}`);
+      await remove(`readonly2pad:${readonlyID}`);
    }));
-    p.push(db.remove(`pad2readonly:${padID}`));
+    p.push(remove(`pad2readonly:${padID}`));
    // delete all chat messages
-    p.push(promises.timesLimit(this.chatHead + 1, 500, async (i: string) => {
+    // @ts-ignore
-      await this.db.remove(`pad:${this.id}:chat:${i}`, null);
+    p.push(timesLimit(this.chatHead + 1, 500, async (i: string) => {
      await remove(`pad:${this.id}:chat:${i}`, null);
    }));
    // delete all revisions
-    p.push(promises.timesLimit(this.head + 1, 500, async (i: string) => {
+    // @ts-ignore
-      await this.db.remove(`pad:${this.id}:revs:${i}`, null);
+    p.push(timesLimit(this.head + 1, 500, async (i: string) => {
      await remove(`pad:${this.id}:revs:${i}`, null);
    }));
    // remove pad from all authors who contributed
    this.getAllAuthors().forEach((authorId) => {
-      p.push(authorManager.removePad(authorId, padID));
+      p.push(removePad(authorId, padID));
    });
    // delete the pad entry and delete pad from padManager
-    p.push(padManager.removePad(padID));
+    p.push(removePad(padID));
-    p.push(hooks.aCallAll('padRemove', {
+    p.push(aCallAll('padRemove', {
      get padID() {
        padUtils.warnDeprecated('padRemove padID context property is deprecated; use pad.id instead');
        // @ts-ignore
        return this.pad.id;
      },
      pad: this,
@ -617,7 +628,7 @@ class Pad {
    await this.saveToDatabase();
  }
-  async addSavedRevision(revNum: string, savedById: string, label: string) {
+  async addSavedRevision(revNum: number, savedById: string, label?: string) {
    // if this revision is already saved, return silently
    for (const i in this.savedRevisions) {
      if (this.savedRevisions[i] && this.savedRevisions[i].revNum === revNum) {
@ -626,12 +637,13 @@ class Pad {
    }
    // build the saved revision object
-    const savedRevision:MapArrayType<any> = {};
+    const savedRevision:PadRevision = {
-    savedRevision.revNum = revNum;
+      revNum,
-    savedRevision.savedById = savedById;
+      savedById,
-    savedRevision.label = label || `Revision ${revNum}`;
+      label: label || `Revision ${revNum}`,
-    savedRevision.timestamp = Date.now();
+      timestamp: Date.now(),
-    savedRevision.id = randomString(10);
+      id: randomString(10),
    };
    // save this new saved revision
    this.savedRevisions.push(savedRevision);
@ -706,7 +718,7 @@ class Pad {
          }
        })
        .batch(100).buffer(99);
-    let atext = Changeset.makeAText('\n');
+    let atext = makeAText('\n');
    for await (const [r, changeset, authorId, timestamp, isKeyRev, keyAText] of revs) {
      try {
        assert(authorId != null);
@ -717,10 +729,10 @@ class Pad {
        assert(timestamp > 0);
        assert(changeset != null);
        assert.equal(typeof changeset, 'string');
-        Changeset.checkRep(changeset);
+        checkRep(changeset);
-        const unpacked = Changeset.unpack(changeset);
+        const unpacked = unpack(changeset);
        let text = atext.text;
-        for (const op of Changeset.deserializeOps(unpacked.ops)) {
+        for (const op of deserializeOps(unpacked.ops)) {
          if (['=', '-'].includes(op.opcode)) {
            assert(text.length >= op.chars);
            const consumed = text.slice(0, op.chars);
@ -731,7 +743,7 @@ class Pad {
          }
          assert.equal(op.attribs, AttributeMap.fromString(op.attribs, pool).toString());
        }
-        atext = Changeset.applyToAText(changeset, atext, pool);
+        atext = applyToAText(changeset, atext, pool);
        if (isKeyRev) assert.deepEqual(keyAText, atext);
      } catch (err:any) {
        err.message = `(pad ${this.id} revision ${r}) ${err.message}`;
@ -759,7 +771,7 @@ class Pad {
        .batch(100).buffer(99);
    for (const p of chats) await p;
-    await hooks.aCallAll('padCheck', {pad: this});
+    await aCallAll('padCheck', {pad: this});
  }
 }
-exports.Pad = Pad;
+export default Pad
--- a/src/node/db/PadManager.ts
+++ b/src/node/db/PadManager.ts
@ -20,11 +20,9 @@
 */
 import {MapArrayType} from "../types/MapType";
-import {PadType} from "../types/PadType";
+import CustomError from '../utils/customError';
-
+import Pad from '../db/Pad';
-const CustomError = require('../utils/customError');
+import {findKeys, get, remove} from './DB';
 const Pad = require('../db/Pad');
 const db = require('./DB');
 const settings = require('../utils/Settings');
 /**
@ -74,7 +72,7 @@ const padList = new class {
  async getPads() {
    if (!this._loaded) {
      this._loaded = (async () => {
-        const dbData = await db.findKeys('pad:*', '*:*:*');
+        const dbData = await findKeys('pad:*', '*:*:*');
        if (dbData == null) return;
        for (const val of dbData) this.addPad(val.replace(/^pad:/, ''));
      })();
@ -106,9 +104,9 @@ const padList = new class {
 * @param {string} [authorId] - Optional author ID of the user that initiated the pad creation (if
 *     applicable).
 */
-exports.getPad = async (id: string, text?: string|null, authorId:string|null = ''):Promise<PadType> => {
+export const getPad = async (id: string, text?: string|null, authorId:string|null = ''):Promise<Pad> => {
  // check if this is a valid padId
-  if (!exports.isValidPadId(id)) {
+  if (!isValidPadId(id)) {
    throw new CustomError(`${id} is not a valid padId`, 'apierror');
  }
@ -133,7 +131,7 @@ exports.getPad = async (id: string, text?: string|null, authorId:string|null = '
  }
  // try to load pad
-  pad = new Pad.Pad(id);
+  pad = new Pad(id);
  // initialize the pad
  await pad.init(text, authorId);
@ -143,7 +141,7 @@ exports.getPad = async (id: string, text?: string|null, authorId:string|null = '
  return pad;
 };
-exports.listAllPads = async () => {
+export const listAllPads = async () => {
  const padIDs = await padList.getPads();
  return {padIDs};
@ -153,14 +151,13 @@ exports.listAllPads = async () => {
 // checks if a pad exists
-exports.doesPadExist = async (padId: string) => {
+// alias for backwards compatibility
-  const value = await db.get(`pad:${padId}`);
+export const doesPadExist = async (padId: string) => {
  const value = await get(`pad:${padId}`);
  return (value != null && value.atext);
 };
 // alias for backwards compatibility
 exports.doesPadExists = exports.doesPadExist;
 /**
 * An array of padId transformations. These represent changes in pad name policy over
@ -172,9 +169,9 @@ const padIdTransforms = [
 ];
 // returns a sanitized padId, respecting legacy pad id formats
-exports.sanitizePadId = async (padId: string) => {
+export const sanitizePadId = async (padId: string) => {
  for (let i = 0, n = padIdTransforms.length; i < n; ++i) {
-    const exists = await exports.doesPadExist(padId);
+    const exists = await doesPadExist(padId);
    if (exists) {
      return padId;
@ -192,19 +189,19 @@ exports.sanitizePadId = async (padId: string) => {
  return padId;
 };
-exports.isValidPadId = (padId: string) => /^(g.[a-zA-Z0-9]{16}\$)?[^$]{1,50}$/.test(padId);
+export const isValidPadId = (padId: string) => /^(g.[a-zA-Z0-9]{16}\$)?[^$]{1,50}$/.test(padId);
 /**
 * Removes the pad from database and unloads it.
 */
-exports.removePad = async (padId: string) => {
+export const removePad = async (padId: string) => {
-  const p = db.remove(`pad:${padId}`);
+  const p = await remove(`pad:${padId}`);
-  exports.unloadPad(padId);
+  unloadPad(padId);
  padList.removePad(padId);
  await p;
 };
 // removes a pad from the cache
-exports.unloadPad = (padId: string) => {
+export const unloadPad = (padId: string) => {
  globalPads.remove(padId);
 };
--- a/src/node/db/ReadOnlyManager.ts
+++ b/src/node/db/ReadOnlyManager.ts
@ -20,8 +20,8 @@
 */
-const db = require('./DB');
+import {get, set} from './DB';
-const randomString = require('../utils/randomstring');
+import {randomString} from '../utils/randomstring';
 /**
@ -29,23 +29,23 @@ const randomString = require('../utils/randomstring');
 * @param {String} id the pad's id
 * @return {Boolean} true if the id is readonly
 */
-exports.isReadOnlyId = (id:string) => id.startsWith('r.');
+export const isReadOnlyId = (id:string): boolean => id.startsWith('r.');
 /**
 * returns a read only id for a pad
 * @param {String} padId the id of the pad
 * @return {String} the read only id
 */
-exports.getReadOnlyId = async (padId:string) => {
+export const getReadOnlyId = async (padId:string): Promise<string> => {
  // check if there is a pad2readonly entry
-  let readOnlyId = await db.get(`pad2readonly:${padId}`);
+  let readOnlyId = await get(`pad2readonly:${padId}`);
  // there is no readOnly Entry in the database, let's create one
  if (readOnlyId == null) {
    readOnlyId = `r.${randomString(16)}`;
    await Promise.all([
-      db.set(`pad2readonly:${padId}`, readOnlyId),
+      set(`pad2readonly:${padId}`, readOnlyId),
-      db.set(`readonly2pad:${readOnlyId}`, padId),
+      set(`readonly2pad:${readOnlyId}`, padId),
    ]);
  }
@ -57,19 +57,23 @@ exports.getReadOnlyId = async (padId:string) => {
 * @param {String} readOnlyId read only id
 * @return {String} the padId
 */
-exports.getPadId = async (readOnlyId:string) => await db.get(`readonly2pad:${readOnlyId}`);
+export const getPadId = async (readOnlyId:string): Promise<string> => await get(`readonly2pad:${readOnlyId}`) as string;
 /**
 * returns the padId and readonlyPadId in an object for any id
 * @param {String} id read only id or real pad id
 * @return {Object} an object with the padId and readonlyPadId
 */
-exports.getIds = async (id:string) => {
+export const getIds = async (id:string): Promise<{
-  const readonly = exports.isReadOnlyId(id);
+  readOnlyPadId: string,
  padId: string,
  readonly: boolean
 }> => {
  const readonly = isReadOnlyId(id);
  // Might be null, if this is an unknown read-only id
-  const readOnlyPadId = readonly ? id : await exports.getReadOnlyId(id);
+  const readOnlyPadId = readonly ? id : await getReadOnlyId(id);
-  const padId = readonly ? await exports.getPadId(id) : id;
+  const padId = readonly ? await getPadId(id) : id;
  return {readOnlyPadId, padId, readonly};
 };
--- a/src/node/db/SecurityManager.ts
+++ b/src/node/db/SecurityManager.ts
@ -21,13 +21,13 @@
 import {UserSettingsObject} from "../types/UserSettingsObject";
-const authorManager = require('./AuthorManager');
+import {getAuthorId} from './AuthorManager';
-const hooks = require('../../static/js/pluginfw/hooks.js');
+import {callAll} from '../../static/js/pluginfw/hooks.js';
-const padManager = require('./PadManager');
+import {doesPadExist, getPad} from './PadManager';
-const readOnlyManager = require('./ReadOnlyManager');
+import {getPadId, isReadOnlyId} from './ReadOnlyManager';
-const sessionManager = require('./SessionManager');
+import {findAuthorID} from './SessionManager';
 const settings = require('../utils/Settings');
-const webaccess = require('../hooks/express/webaccess');
+import {normalizeAuthzLevel} from '../hooks/express/webaccess';
 const log4js = require('log4js');
 const authLogger = log4js.getLogger('auth');
 import {padUtils as padutils} from '../../static/js/pad_utils';
@ -57,7 +57,14 @@ const DENY = Object.freeze({accessStatus: 'deny'});
 * @param {Object} userSettings
 * @return {DENY|{accessStatus: String, authorID: String}}
 */
-exports.checkAccess = async (padID:string, sessionCookie:string, token:string, userSettings:UserSettingsObject) => {
+
 type CheckAccessStat = {
  accessStatus: string;
  authorID?: string;
 }
 export const checkAccess = async (padID:string, sessionCookie:string, token:string, userSettings:UserSettingsObject): Promise<CheckAccessStat> => {
  if (!padID) {
    authLogger.debug('access denied: missing padID');
    return DENY;
@ -65,9 +72,9 @@ exports.checkAccess = async (padID:string, sessionCookie:string, token:string, u
  let canCreate = !settings.editOnly;
-  if (readOnlyManager.isReadOnlyId(padID)) {
+  if (isReadOnlyId(padID)) {
    canCreate = false;
-    padID = await readOnlyManager.getPadId(padID);
+    padID = await getPadId(padID);
    if (padID == null) {
      authLogger.debug('access denied: read-only pad ID for a pad that does not exist');
      return DENY;
@ -88,7 +95,7 @@ exports.checkAccess = async (padID:string, sessionCookie:string, token:string, u
    // Note: userSettings.padAuthorizations should still be populated even if
    // settings.requireAuthorization is false.
    const padAuthzs = userSettings.padAuthorizations || {};
-    const level = webaccess.normalizeAuthzLevel(padAuthzs[padID]);
+    const level = normalizeAuthzLevel(padAuthzs[padID]);
    if (!level) {
      authLogger.debug('access denied: unauthorized');
      return DENY;
@ -98,18 +105,18 @@ exports.checkAccess = async (padID:string, sessionCookie:string, token:string, u
  // allow plugins to deny access
  const isFalse = (x:boolean) => x === false;
-  if (hooks.callAll('onAccessCheck', {padID, token, sessionCookie}).some(isFalse)) {
+  if (callAll('onAccessCheck', {padID, token, sessionCookie}).some(isFalse)) {
    authLogger.debug('access denied: an onAccessCheck hook function returned false');
    return DENY;
  }
-  const padExists = await padManager.doesPadExist(padID);
+  const padExists = await doesPadExist(padID);
  if (!padExists && !canCreate) {
    authLogger.debug('access denied: user attempted to create a pad, which is prohibited');
    return DENY;
  }
-  const sessionAuthorID = await sessionManager.findAuthorID(padID.split('$')[0], sessionCookie);
+  const sessionAuthorID = await findAuthorID(padID.split('$')[0], sessionCookie);
  if (settings.requireSession && !sessionAuthorID) {
    authLogger.debug('access denied: HTTP API session is required');
    return DENY;
@ -122,7 +129,7 @@ exports.checkAccess = async (padID:string, sessionCookie:string, token:string, u
  const grant = {
    accessStatus: 'grant',
-    authorID: sessionAuthorID || await authorManager.getAuthorId(token, userSettings),
+    authorID: sessionAuthorID || await getAuthorId(token, userSettings),
  };
  if (!padID.includes('$')) {
@ -139,7 +146,7 @@ exports.checkAccess = async (padID:string, sessionCookie:string, token:string, u
    return grant;
  }
-  const pad = await padManager.getPad(padID);
+  const pad = await getPad(padID);
  if (!pad.getPublicStatus() && sessionAuthorID == null) {
    authLogger.debug('access denied: must have an HTTP API session to access private group pads');
--- a/src/node/db/SessionManager.ts
+++ b/src/node/db/SessionManager.ts
@ -20,12 +20,25 @@
 * limitations under the License.
 */
-const CustomError = require('../utils/customError');
+import CustomError from '../utils/customError';
-const promises = require('../utils/promises');
+import {firstSatisfies} from '../utils/promises';
-const randomString = require('../utils/randomstring');
+import {randomString} from '../utils/randomstring';
-const db = require('./DB');
+import {get, remove, set, setSub} from './DB';
-const groupManager = require('./GroupManager');
+import {doesGroupExist} from './GroupManager';
-const authorManager = require('./AuthorManager');
+import {doesAuthorExist} from './AuthorManager';
 type Session = {
  groupID: string;
  authorID: string;
  validUntil: number;
 };
 type Author2Sessions = {
  sessionIDs: {
    [key: string]: Session;
  };
 }
 /**
 * Finds the author ID for a session with matching ID and group.
@ -36,7 +49,7 @@ const authorManager = require('./AuthorManager');
 *     sessionCookie, and is bound to a group with the given ID, then this returns the author ID
 *     bound to the session. Otherwise, returns undefined.
 */
-exports.findAuthorID = async (groupID:string, sessionCookie: string) => {
+export const findAuthorID = async (groupID:string, sessionCookie: string) => {
  if (!sessionCookie) return undefined;
  /*
   * Sometimes, RFC 6265-compliant web servers may send back a cookie whose
@ -64,7 +77,7 @@ exports.findAuthorID = async (groupID:string, sessionCookie: string) => {
  const sessionIDs = sessionCookie.replace(/^"|"$/g, '').split(',');
  const sessionInfoPromises = sessionIDs.map(async (id) => {
    try {
-      return await exports.getSessionInfo(id);
+      return await getSessionInfo(id);
    } catch (err:any) {
      if (err.message === 'sessionID does not exist') {
        console.debug(`SessionManager getAuthorID: no session exists with ID ${id}`);
@ -79,7 +92,7 @@ exports.findAuthorID = async (groupID:string, sessionCookie: string) => {
    groupID: string;
    validUntil: number;
  }|null) => (si != null && si.groupID === groupID && now < si.validUntil);
-  const sessionInfo = await promises.firstSatisfies(sessionInfoPromises, isMatch);
+  const sessionInfo = await firstSatisfies(sessionInfoPromises, isMatch) as Session;
  if (sessionInfo == null) return undefined;
  return sessionInfo.authorID;
 };
@ -89,9 +102,9 @@ exports.findAuthorID = async (groupID:string, sessionCookie: string) => {
 * @param {String} sessionID The id of the session
 * @return {Promise<boolean>} Resolves to true if the session exists
 */
-exports.doesSessionExist = async (sessionID: string) => {
+export const doesSessionExist = async (sessionID: string) => {
  // check if the database entry of this session exists
-  const session = await db.get(`session:${sessionID}`);
+  const session = await get(`session:${sessionID}`) as Session;
  return (session != null);
 };
@ -102,15 +115,15 @@ exports.doesSessionExist = async (sessionID: string) => {
 * @param {Number} validUntil The unix timestamp when the session should expire
 * @return {Promise<{sessionID: string}>} the id of the new session
 */
-exports.createSession = async (groupID: string, authorID: string, validUntil: number) => {
+export const createSession = async (groupID: string, authorID: string, validUntil: number) => {
  // check if the group exists
-  const groupExists = await groupManager.doesGroupExist(groupID);
+  const groupExists = await doesGroupExist(groupID);
  if (!groupExists) {
    throw new CustomError('groupID does not exist', 'apierror');
  }
  // check if the author exists
-  const authorExists = await authorManager.doesAuthorExist(authorID);
+  const authorExists = await doesAuthorExist(authorID);
  if (!authorExists) {
    throw new CustomError('authorID does not exist', 'apierror');
  }
@ -144,15 +157,15 @@ exports.createSession = async (groupID: string, authorID: string, validUntil: nu
  const sessionID = `s.${randomString(16)}`;
  // set the session into the database
-  await db.set(`session:${sessionID}`, {groupID, authorID, validUntil});
+  await set(`session:${sessionID}`, {groupID, authorID, validUntil} satisfies Session);
  // Add the session ID to the group2sessions and author2sessions records after creating the session
  // so that the state is consistent.
  await Promise.all([
    // UeberDB's setSub() method atomically reads the record, updates the appropriate (sub)object
    // property, and writes the result.
-    db.setSub(`group2sessions:${groupID}`, ['sessionIDs', sessionID], 1),
+    setSub(`group2sessions:${groupID}`, ['sessionIDs', sessionID], 1),
-    db.setSub(`author2sessions:${authorID}`, ['sessionIDs', sessionID], 1),
+    setSub(`author2sessions:${authorID}`, ['sessionIDs', sessionID], 1),
  ]);
  return {sessionID};
@ -163,9 +176,9 @@ exports.createSession = async (groupID: string, authorID: string, validUntil: nu
 * @param {String} sessionID The id of the session
 * @return {Promise<Object>} the sessioninfos
 */
-exports.getSessionInfo = async (sessionID:string) => {
+export const getSessionInfo = async (sessionID:string): Promise<Session> => {
  // check if the database entry of this session exists
-  const session = await db.get(`session:${sessionID}`);
+  const session = await get(`session:${sessionID}`) as Session;
  if (session == null) {
    // session does not exist
@ -181,9 +194,9 @@ exports.getSessionInfo = async (sessionID:string) => {
 * @param {String} sessionID The id of the session
 * @return {Promise<void>} Resolves when the session is deleted
 */
-exports.deleteSession = async (sessionID:string) => {
+export const deleteSession = async (sessionID:string): Promise<void> => {
  // ensure that the session exists
-  const session = await db.get(`session:${sessionID}`);
+  const session = await get(`session:${sessionID}`) as Session;
  if (session == null) {
    throw new CustomError('sessionID does not exist', 'apierror');
  }
@ -196,13 +209,13 @@ exports.deleteSession = async (sessionID:string) => {
    // UeberDB's setSub() method atomically reads the record, updates the appropriate (sub)object
    // property, and writes the result. Setting a property to `undefined` deletes that property
    // (JSON.stringify() ignores such properties).
-    db.setSub(`group2sessions:${groupID}`, ['sessionIDs', sessionID], undefined),
+    setSub(`group2sessions:${groupID}`, ['sessionIDs', sessionID], undefined),
-    db.setSub(`author2sessions:${authorID}`, ['sessionIDs', sessionID], undefined),
+    setSub(`author2sessions:${authorID}`, ['sessionIDs', sessionID], undefined),
  ]);
  // Delete the session record after updating group2sessions and author2sessions so that the state
  // is consistent.
-  await db.remove(`session:${sessionID}`);
+  await remove(`session:${sessionID}`);
 };
 /**
@ -210,15 +223,14 @@ exports.deleteSession = async (sessionID:string) => {
 * @param {String} groupID The id of the group
 * @return {Promise<Object>} The sessioninfos of all sessions of this group
 */
-exports.listSessionsOfGroup = async (groupID: string) => {
+export const listSessionsOfGroup = async (groupID: string) => {
  // check that the group exists
-  const exists = await groupManager.doesGroupExist(groupID);
+  const exists = await doesGroupExist(groupID);
  if (!exists) {
    throw new CustomError('groupID does not exist', 'apierror');
  }
-  const sessions = await listSessionsWithDBKey(`group2sessions:${groupID}`);
+  return await listSessionsWithDBKey(`group2sessions:${groupID}`);
  return sessions;
 };
 /**
@ -226,9 +238,9 @@ exports.listSessionsOfGroup = async (groupID: string) => {
 * @param {String} authorID The id of the author
 * @return {Promise<Object>} The sessioninfos of all sessions of this author
 */
-exports.listSessionsOfAuthor = async (authorID: string) => {
+export const listSessionsOfAuthor = async (authorID: string): Promise<object> => {
  // check that the author exists
-  const exists = await authorManager.doesAuthorExist(authorID);
+  const exists = await doesAuthorExist(authorID);
  if (!exists) {
    throw new CustomError('authorID does not exist', 'apierror');
  }
@ -243,15 +255,15 @@ exports.listSessionsOfAuthor = async (authorID: string) => {
 * @param {String} dbkey The db key to use to get the sessions
 * @return {Promise<*>}
 */
-const listSessionsWithDBKey = async (dbkey: string) => {
+const listSessionsWithDBKey = async (dbkey: string): Promise<any> => {
  // get the group2sessions entry
-  const sessionObject = await db.get(dbkey);
+  const sessionObject = await get(dbkey);
  const sessions = sessionObject ? sessionObject.sessionIDs : null;
  // iterate through the sessions and get the sessioninfos
  for (const sessionID of Object.keys(sessions || {})) {
    try {
-      sessions[sessionID] = await exports.getSessionInfo(sessionID);
+      sessions[sessionID] = await getSessionInfo(sessionID);
    } catch (err:any) {
      if (err.name === 'apierror') {
        console.warn(`Found bad session ${sessionID} in ${dbkey}`);
--- a/src/node/db/SessionStore.ts
+++ b/src/node/db/SessionStore.ts
@ -1,9 +1,9 @@
 'use strict';
-const DB = require('./DB');
+import {get, remove, set} from './DB';
 const Store = require('@etherpad/express-session').Store;
-const log4js = require('log4js');
+import log4js from 'log4js';
-const util = require('util');
+import util from 'util';
 const logger = log4js.getLogger('SessionStore');
@ -19,7 +19,7 @@ class SessionStore extends Store {
   *     Etherpad is restarted. Use `null` to prevent `touch()` from ever updating the record.
   *     Ignored if the cookie does not expire.
   */
-  constructor(refresh = null) {
+  constructor(refresh: number | null = null) {
    super();
    this._refresh = refresh;
    // Maps session ID to an object with the following properties:
@ -65,12 +65,12 @@ class SessionStore extends Store {
  }
  async _write(sid: string, sess: any) {
-    await DB.set(`sessionstorage:${sid}`, sess);
+    await set(`sessionstorage:${sid}`, sess);
  }
  async _get(sid: string) {
    logger.debug(`GET ${sid}`);
-    const s = await DB.get(`sessionstorage:${sid}`);
+    const s = await get(`sessionstorage:${sid}`);
    return await this._updateExpirations(sid, s);
  }
@ -84,7 +84,7 @@ class SessionStore extends Store {
    logger.debug(`DESTROY ${sid}`);
    clearTimeout((this._expirations.get(sid) || {}).timeout);
    this._expirations.delete(sid);
-    await DB.remove(`sessionstorage:${sid}`);
+    await remove(`sessionstorage:${sid}`);
  }
  // Note: express-session might call touch() before it calls set() for the first time. Ideally this
@ -111,4 +111,4 @@ for (const m of ['get', 'set', 'destroy', 'touch']) {
  SessionStore.prototype[m] = util.callbackify(SessionStore.prototype[`_${m}`]);
 }
-module.exports = SessionStore;
+export default SessionStore
--- a/src/node/eejs/index.ts
+++ b/src/node/eejs/index.ts
@ -20,54 +20,61 @@
 * require("./index").require("./path/to/template.ejs")
 */
-const ejs = require('ejs');
+import ejs from 'ejs';
-const fs = require('fs');
+import fs from 'fs';
-const hooks = require('../../static/js/pluginfw/hooks.js');
+import {callAll} from '../../static/js/pluginfw/hooks.js';
-const path = require('path');
+import path from 'path';
-const resolve = require('resolve');
+import resolve from 'resolve';
 const settings = require('../utils/Settings');
 import {pluginInstallPath} from '../../static/js/pluginfw/installer'
 const templateCache = new Map();
-exports.info = {
+export const info: {
  __output_stack: any[],
  block_stack: string[],
  file_stack: {path: string}[],
  args: any[],
  __output: any
 } = {
  __output_stack: [],
  block_stack: [],
  file_stack: [],
  args: [],
  __output: null
 };
-const getCurrentFile = () => exports.info.file_stack[exports.info.file_stack.length - 1];
+const getCurrentFile = () => info.file_stack[info.file_stack.length - 1];
-exports._init = (b: any, recursive: boolean) => {
+export const _init = (b: any, recursive: boolean) => {
-  exports.info.__output_stack.push(exports.info.__output);
+  info.__output_stack.push(info.__output);
-  exports.info.__output = b;
+  info.__output = b;
 };
-exports._exit = (b:any, recursive:boolean) => {
+export const _exit = (b:any, recursive:boolean) => {
-  exports.info.__output = exports.info.__output_stack.pop();
+  info.__output = info.__output_stack.pop();
 };
-exports.begin_block = (name:string) => {
+export const begin_block = (name:string) => {
-  exports.info.block_stack.push(name);
+  info.block_stack.push(name);
-  exports.info.__output_stack.push(exports.info.__output.get());
+  info.__output_stack.push(info.__output.get());
-  exports.info.__output.set('');
+  info.__output.set('');
 };
-exports.end_block = () => {
+export const end_block = () => {
-  const name = exports.info.block_stack.pop();
+  const name = info.block_stack.pop();
-  const renderContext = exports.info.args[exports.info.args.length - 1];
+  const renderContext = info.args[info.args.length - 1];
-  const content = exports.info.__output.get();
+  const content = info.__output.get();
-  exports.info.__output.set(exports.info.__output_stack.pop());
+  info.__output.set(info.__output_stack.pop());
  const args = {content, renderContext};
-  hooks.callAll(`eejsBlock_${name}`, args);
+  callAll(`eejsBlock_${name}`, args);
-  exports.info.__output.set(exports.info.__output.get().concat(args.content));
+  info.__output.set(info.__output.get().concat(args.content));
 };
-exports.require = (name:string, args:{
+export const requireP = (name:string, args:{
  e?: Function,
-    require?: Function,
+  require?: string,
-}, mod:{
+}, mod?:{
  filename:string,
    paths:string[],
 }) => {
@ -76,7 +83,7 @@ exports.require = (name:string, args:{
  let basedir = __dirname;
  let paths:string[] = [];
-  if (exports.info.file_stack.length) {
+  if (info.file_stack.length) {
    basedir = path.dirname(getCurrentFile().path);
  }
  if (mod) {
@ -94,20 +101,21 @@ exports.require = (name:string, args:{
  const ejspath = resolve.sync(name, {paths, basedir, extensions: ['.html', '.ejs']});
  args.e = exports;
-  args.require = require;
+  // @ts-ignore
  args.require = requireP;
-  const cache = settings.maxAge !== 0;
+  const cache: boolean = settings.maxAge !== 0;
  const template = cache && templateCache.get(ejspath) || ejs.compile(
      '<% e._init({get: () => __output, set: (s) => { __output = s; }}); %>' +
        `${fs.readFileSync(ejspath).toString()}<% e._exit(); %>`,
      {filename: ejspath});
  if (cache) templateCache.set(ejspath, template);
-  exports.info.args.push(args);
+  info.args.push(args);
-  exports.info.file_stack.push({path: ejspath});
+  info.file_stack.push({path: ejspath});
  const res = template(args);
-  exports.info.file_stack.pop();
+  info.file_stack.pop();
-  exports.info.args.pop();
+  info.args.pop();
  return res;
 };
--- a/src/node/handler/PadMessageHandler.ts
+++ b/src/node/handler/PadMessageHandler.ts
@ -22,34 +22,38 @@
 import {MapArrayType} from "../types/MapType";
 import AttributeMap from '../../static/js/AttributeMap';
-const padManager = require('../db/PadManager');
+import {doesPadExist, getPad, sanitizePadId} from '../db/PadManager';
-const Changeset = require('../../static/js/Changeset');
+import {checkRep, cloneAText, compose, deserializeOps, follow, identity, inverse, makeAText, makeSplice, moveOpsToNewPool, mutateTextLines, oldLen, prepareForWire, splitAttributionLines, splitTextLines, unpack} from '../../static/js/Changeset';
-const ChatMessage = require('../../static/js/ChatMessage');
+import ChatMessage from '../../static/js/ChatMessage';
 import AttributePool from '../../static/js/AttributePool';
 import AttributeManager from '../../static/js/AttributeManager';
-const authorManager = require('../db/AuthorManager');
+import {getAuthor, getAuthorColorId, getAuthorName, getColorPalette, setAuthorColorId, setAuthorName} from '../db/AuthorManager';
-const {padutils} = require('../../static/js/pad_utils');
+import {padUtils} from '../../static/js/pad_utils';
-const readOnlyManager = require('../db/ReadOnlyManager');
+import {getIds} from '../db/ReadOnlyManager';
-const settings = require('../utils/Settings');
+import settings from '../utils/Settings';
-const securityManager = require('../db/SecurityManager');
+import {checkAccess} from '../db/SecurityManager';
-const plugins = require('../../static/js/pluginfw/plugin_defs.js');
+import {pluginDefs} from '../../static/js/pluginfw/plugin_defs.js';
 import log4js from 'log4js';
 const messageLogger = log4js.getLogger('message');
 const accessLogger = log4js.getLogger('access');
-const hooks = require('../../static/js/pluginfw/hooks.js');
+import {aCallAll, deprecationNotices} from '../../static/js/pluginfw/hooks.js';
-const stats = require('../stats')
+import {measuredCollection} from '../stats';
 const assert = require('assert').strict;
 import {RateLimiterMemory} from 'rate-limiter-flexible';
 import {ChangesetRequest, PadUserInfo, SocketClientRequest} from "../types/SocketClientRequest";
-import {APool, AText, PadAuthor, PadType} from "../types/PadType";
+import {AText, PadAuthor, PadType} from "../types/PadType";
 import {ChangeSet} from "../types/ChangeSet";
-const webaccess = require('../hooks/express/webaccess');
+import Pad from "../db/Pad";
-const { checkValidRev } = require('../utils/checkValidRev');
+import { userCanModify} from '../hooks/express/webaccess';
 import {checkValidRev} from '../utils/checkValidRev';
 import {AttributePoolWire, ChangesetRequestMessage, ChatMessageMessage, ClientReadyMessage, ClientSendMessages, ClientUserChangesMessage, ClientVarMessage, ClientVarPayload, HistoricalAuthorData, UserChanges, UserSuggestUserName} from "../../static/js/types/SocketIOMessage";
 import {AttributionLinesMutator} from "../../static/js/AttributionLinesMutator";
 import {Builder} from "../../static/js/Builder";
 let rateLimiter:any;
-let socketio: any = null;
+let _socketio: any = null;
-hooks.deprecationNotices.clientReady = 'use the userJoin hook instead';
+deprecationNotices.clientReady = 'use the userJoin hook instead';
 const addContextToError = (err:any, pfx:string) => {
  const newErr = new Error(`${pfx}${err.message}`, {cause: err});
@ -60,7 +64,7 @@ const addContextToError = (err:any, pfx:string) => {
  return err;
 };
-exports.socketio = () => {
+export const socketio = () => {
  // The rate limiter is created in this hook so that restarting the server resets the limiter. The
  // settings.commitRateLimiting object is passed directly to the rate limiter so that the limits
  // can be dynamically changed during runtime by modifying its properties.
@ -85,11 +89,10 @@ exports.socketio = () => {
 *       - readonly: Whether the client has read-only access (true) or read/write access (false).
 *       - rev: The last revision that was sent to the client.
 */
-const sessioninfos:MapArrayType<any> = {};
+export const sessioninfos:MapArrayType<any> = {};
 exports.sessioninfos = sessioninfos;
-stats.gauge('totalUsers', () => socketio ? socketio.engine.clientsCount : 0);
+measuredCollection.gauge('totalUsers', () => _socketio ? _socketio.engine.clientsCount : 0);
-stats.gauge('activePads', () => {
+measuredCollection.gauge('activePads', () => {
  const padIds = new Set();
  for (const {padId} of Object.values(sessioninfos)) {
    if (!padId) continue;
@ -108,7 +111,7 @@ class Channels {
   * @param {(ch, task) => any} [exec] - Task executor. If omitted, tasks are assumed to be
   *     functions that will be executed with the channel as the only argument.
   */
-  constructor(exec = (ch: string, task:any) => task(ch)) {
+  constructor(exec: (ch:any, task:any) => any = (ch: string, task:any) => task(ch)) {
    this._exec = exec;
    this._promiseChains = new Map();
  }
@ -143,16 +146,16 @@ const padChannels = new Channels((ch, {socket, message}) => handleUserChanges(so
 * This Method is called by server.ts to tell the message handler on which socket it should send
 * @param socket_io The Socket
 */
-exports.setSocketIO = (socket_io:any) => {
+export const setSocketIO = (socket_io:any) => {
-  socketio = socket_io;
+  _socketio = socket_io;
 };
 /**
 * Handles the connection of a new user
 * @param socket the socket.io Socket object for the new connection from the client
 */
-exports.handleConnect = (socket:any) => {
+export const handleConnect = (socket:any) => {
-  stats.meter('connects').mark();
+  measuredCollection.meter('connects').mark();
  // Initialize sessioninfos for this new session
  sessioninfos[socket.id] = {};
@ -161,23 +164,23 @@ exports.handleConnect = (socket:any) => {
 /**
 * Kicks all sessions from a pad
 */
-exports.kickSessionsFromPad = (padID: string) => {
+export const kickSessionsFromPad = (padID: string) => {
-  if(socketio.sockets == null) return;
+  if(_socketio.sockets == null) return;
  // skip if there is nobody on this pad
  if (_getRoomSockets(padID).length === 0) return;
  // disconnect everyone from this pad
-  socketio.in(padID).emit('message', {disconnect: 'deleted'});
+  _socketio.in(padID).emit('message', {disconnect: 'deleted'});
 };
 /**
 * Handles the disconnection of a user
 * @param socket the socket.io Socket object for the client
 */
-exports.handleDisconnect = async (socket:any) => {
+export const handleDisconnect = async (socket:any) => {
-  stats.meter('disconnects').mark();
+  measuredCollection.meter('disconnects').mark();
  const session = sessioninfos[socket.id];
  delete sessioninfos[socket.id];
  // session.padId can be nullish if the user disconnects before sending CLIENT_READY.
@ -196,12 +199,12 @@ exports.handleDisconnect = async (socket:any) => {
    data: {
      type: 'USER_LEAVE',
      userInfo: {
-        colorId: await authorManager.getAuthorColorId(session.author),
+        colorId: await getAuthorColorId(session.author),
        userId: session.author,
      },
    },
  });
-  await hooks.aCallAll('userLeave', {
+  await aCallAll('userLeave', {
    ...session, // For backwards compatibility.
    authorId: session.author,
    readOnly: session.readonly,
@ -214,7 +217,7 @@ exports.handleDisconnect = async (socket:any) => {
 * @param socket the socket.io Socket object for the client
 * @param message the message from the client
 */
-exports.handleMessage = async (socket:any, message:typeof ChatMessage) => {
+export const handleMessage = async (socket:any, message: ClientVarMessage) => {
  const env = process.env.NODE_ENV || 'development';
  if (env === 'production') {
@ -223,7 +226,7 @@ exports.handleMessage = async (socket:any, message:typeof ChatMessage) => {
    } catch (err) {
      messageLogger.warn(`Rate limited IP ${socket.request.ip}. To reduce the amount of rate ` +
                         'limiting that happens edit the rateLimit values in settings.json');
-      stats.meter('rateLimited').mark();
+      measuredCollection.meter('rateLimited').mark();
      socket.emit('message', {disconnect: 'rateLimited'});
      throw err;
    }
@ -246,14 +249,14 @@ exports.handleMessage = async (socket:any, message:typeof ChatMessage) => {
    };
    // Pad does not exist, so we need to sanitize the id
-    if (!(await padManager.doesPadExist(thisSession.auth.padID))) {
+    if (!(await doesPadExist(thisSession.auth.padID))) {
-      thisSession.auth.padID = await padManager.sanitizePadId(thisSession.auth.padID);
+      thisSession.auth.padID = await sanitizePadId(thisSession.auth.padID);
    }
-    const padIds = await readOnlyManager.getIds(thisSession.auth.padID);
+    const padIds = await getIds(thisSession.auth.padID);
    thisSession.padId = padIds.padId;
    thisSession.readOnlyPadId = padIds.readOnlyPadId;
    thisSession.readonly =
-        padIds.readonly || !webaccess.userCanModify(thisSession.auth.padID, socket.client.request);
+        padIds.readonly || !userCanModify(thisSession.auth.padID, socket.client.request);
  }
  // Outside of the checks done by this function, message.padId must not be accessed because it is
  // too easy to introduce a security vulnerability that allows malicious users to read or modify
@ -273,7 +276,7 @@ exports.handleMessage = async (socket:any, message:typeof ChatMessage) => {
  const {session: {user} = {}} = socket.client.request as SocketClientRequest;
  const {accessStatus, authorID} =
-      await securityManager.checkAccess(auth.padID, auth.sessionID, auth.token, user);
+      await checkAccess(auth.padID, auth.sessionID, auth.token, user);
  if (accessStatus !== 'grant') {
    socket.emit('message', {accessStatus});
    throw new Error('access denied');
@ -303,16 +306,16 @@ exports.handleMessage = async (socket:any, message:typeof ChatMessage) => {
    },
    socket,
    get client() {
-      padutils.warnDeprecated(
+      padUtils.warnDeprecated(
          'the `client` context property for the handleMessageSecurity and handleMessage hooks ' +
          'is deprecated; use the `socket` property instead');
      return this.socket;
    },
  };
-  for (const res of await hooks.aCallAll('handleMessageSecurity', context)) {
+  for (const res of await aCallAll('handleMessageSecurity', context)) {
    switch (res) {
      case true:
-        padutils.warnDeprecated(
+        padUtils.warnDeprecated(
            'returning `true` from a `handleMessageSecurity` hook function is deprecated; ' +
            'return "permitOnce" instead');
        thisSession.readonly = false;
@ -327,7 +330,7 @@ exports.handleMessage = async (socket:any, message:typeof ChatMessage) => {
  }
  // Call handleMessage hook. If a plugin returns null, the message will be dropped.
-  if ((await hooks.aCallAll('handleMessage', context)).some((m: null|string) => m == null)) {
+  if ((await aCallAll('handleMessage', context)).some((m: null|string) => m == null)) {
    return;
  }
@ -345,7 +348,7 @@ exports.handleMessage = async (socket:any, message:typeof ChatMessage) => {
        try {
          switch (type) {
            case 'USER_CHANGES':
-              stats.counter('pendingEdits').inc();
+              measuredCollection.counter('pendingEdits').inc();
              await padChannels.enqueue(thisSession.padId, {socket, message});
              break;
            case 'USERINFO_UPDATE': await handleUserInfoUpdate(socket, message); break;
@ -386,7 +389,7 @@ exports.handleMessage = async (socket:any, message:typeof ChatMessage) => {
 */
 const handleSaveRevisionMessage = async (socket:any, message: string) => {
  const {padId, author: authorId} = sessioninfos[socket.id];
-  const pad = await padManager.getPad(padId, null, authorId);
+  const pad = await getPad(padId, null, authorId);
  await pad.addSavedRevision(pad.head, authorId);
 };
@ -397,14 +400,14 @@ const handleSaveRevisionMessage = async (socket:any, message: string) => {
 * @param msg {Object} the message we're sending
 * @param sessionID {string} the socketIO session to which we're sending this message
 */
-exports.handleCustomObjectMessage = (msg: typeof ChatMessage, sessionID: string) => {
+export const handleCustomObjectMessage = (msg: ClientVarMessage, sessionID: string) => {
-  if (msg.data.type === 'CUSTOM') {
+  if ("data" in msg && msg.type != 'CLIENT_VARS' && msg.data.type === 'CUSTOM') {
    if (sessionID) {
      // a sessionID is targeted: directly to this sessionID
-      socketio.sockets.socket(sessionID).emit('message', msg);
+      _socketio.sockets.socket(sessionID).emit('message', msg);
    } else {
      // broadcast to all clients on this pad
-      socketio.sockets.in(msg.data.payload.padId).emit('message', msg);
+      _socketio.sockets.in(msg.data.payload.padId).emit('message', msg);
    }
  }
 };
@ -415,7 +418,7 @@ exports.handleCustomObjectMessage = (msg: typeof ChatMessage, sessionID: string)
 * @param padID {Pad} the pad to which we're sending this message
 * @param msgString {String} the message we're sending
 */
-exports.handleCustomMessage = (padID: string, msgString:string) => {
+export const handleCustomMessage = (padID: string, msgString:string) => {
  const time = Date.now();
  const msg = {
    type: 'COLLABROOM',
@ -424,7 +427,7 @@ exports.handleCustomMessage = (padID: string, msgString:string) => {
      time,
    },
  };
-  socketio.sockets.in(padID).emit('message', msg);
+  _socketio.sockets.in(padID).emit('message', msg);
 };
 /**
@ -432,13 +435,13 @@ exports.handleCustomMessage = (padID: string, msgString:string) => {
 * @param socket the socket.io Socket object for the client
 * @param message the message from the client
 */
-const handleChatMessage = async (socket:any, message: typeof ChatMessage) => {
+const handleChatMessage = async (socket:any, message: ChatMessageMessage) => {
  const chatMessage = ChatMessage.fromObject(message.data.message);
  const {padId, author: authorId} = sessioninfos[socket.id];
  // Don't trust the user-supplied values.
  chatMessage.time = Date.now();
  chatMessage.authorId = authorId;
-  await exports.sendChatMessageToPadClients(chatMessage, padId);
+  await sendChatMessageToPadClients(chatMessage, padId);
 };
 /**
@ -452,16 +455,16 @@ const handleChatMessage = async (socket:any, message: typeof ChatMessage) => {
 * @param {string} [padId] - The destination pad ID. Deprecated; pass a chat message
 *     object as the first argument and the destination pad ID as the second argument instead.
 */
-exports.sendChatMessageToPadClients = async (mt: typeof ChatMessage|number, puId: string, text:string|null = null, padId:string|null = null) => {
+export const sendChatMessageToPadClients = async (mt: ChatMessage|number, puId: string, text:string|null = null, padId:string|null = null) => {
  const message = mt instanceof ChatMessage ? mt : new ChatMessage(text, puId, mt);
  padId = mt instanceof ChatMessage ? puId : padId;
-  const pad = await padManager.getPad(padId, null, message.authorId);
+  const pad = await getPad(padId!, null, message.authorId);
-  await hooks.aCallAll('chatNewMessage', {message, pad, padId});
+  await aCallAll('chatNewMessage', {message, pad, padId});
  // pad.appendChatMessage() ignores the displayName property so we don't need to wait for
  // authorManager.getAuthorName() to resolve before saving the message to the database.
  const promise = pad.appendChatMessage(message);
-  message.displayName = await authorManager.getAuthorName(message.authorId);
+  message.displayName = await getAuthorName(message.authorId!);
-  socketio.sockets.in(padId).emit('message', {
+  _socketio.sockets.in(padId).emit('message', {
    type: 'COLLABROOM',
    data: {type: 'CHAT_MESSAGE', message},
  });
@ -479,7 +482,7 @@ const handleGetChatMessages = async (socket:any, {data: {start, end}}:any) => {
  const count = end - start;
  if (count < 0 || count > 100) throw new Error(`invalid number of messages: ${count}`);
  const {padId, author: authorId} = sessioninfos[socket.id];
-  const pad = await padManager.getPad(padId, null, authorId);
+  const pad = await getPad(padId, null, authorId);
  const chatMessages = await pad.getChatMessages(start, end);
  const infoMsg = {
@ -499,7 +502,7 @@ const handleGetChatMessages = async (socket:any, {data: {start, end}}:any) => {
 * @param socket the socket.io Socket object for the client
 * @param message the message from the client
 */
-const handleSuggestUserName = (socket:any, message: typeof ChatMessage) => {
+const handleSuggestUserName = (socket:any, message: UserSuggestUserName) => {
  const {newName, unnamedId} = message.data.payload;
  if (newName == null) throw new Error('missing newName');
  if (unnamedId == null) throw new Error('missing unnamedId');
@ -531,8 +534,8 @@ const handleUserInfoUpdate = async (socket:any, {data: {userInfo: {name, colorId
  // Tell the authorManager about the new attributes
  const p = Promise.all([
-    authorManager.setAuthorColorId(author, colorId),
+    setAuthorColorId(author, colorId),
-    authorManager.setAuthorName(author, name),
+    setAuthorName(author, name!),
  ]);
  const padId = session.padId;
@ -567,9 +570,9 @@ const handleUserInfoUpdate = async (socket:any, {data: {userInfo: {name, colorId
 * @param socket the socket.io Socket object for the client
 * @param message the message from the client
 */
-const handleUserChanges = async (socket:any, message: typeof ChatMessage) => {
+const handleUserChanges = async (socket:any, message: UserChanges) => {
  // This one's no longer pending, as we're gonna process it now
-  stats.counter('pendingEdits').dec();
+  measuredCollection.counter('pendingEdits').dec();
  // The client might disconnect between our callbacks. We should still
  // finish processing the changeset, so keep a reference to the session.
@ -581,20 +584,20 @@ const handleUserChanges = async (socket:any, message: typeof ChatMessage) => {
  if (!thisSession) throw new Error('client disconnected');
  // Measure time to process edit
-  const stopWatch = stats.timer('edits').start();
+  const stopWatch = measuredCollection.timer('edits').start();
  try {
    const {data: {baseRev, apool, changeset}} = message;
    if (baseRev == null) throw new Error('missing baseRev');
    if (apool == null) throw new Error('missing apool');
    if (changeset == null) throw new Error('missing changeset');
    const wireApool = (new AttributePool()).fromJsonable(apool);
-    const pad = await padManager.getPad(thisSession.padId, null, thisSession.author);
+    const pad = await getPad(thisSession.padId, null, thisSession.author);
    // Verify that the changeset has valid syntax and is in canonical form
-    Changeset.checkRep(changeset);
+    checkRep(changeset);
    // Validate all added 'author' attribs to be the same value as the current user
-    for (const op of Changeset.deserializeOps(Changeset.unpack(changeset).ops)) {
+    for (const op of deserializeOps(unpack(changeset).ops)) {
      // + can add text with attribs
      // = can change or add attribs
      // - can have attribs, but they are discarded and don't show up in the attribs -
@ -613,7 +616,7 @@ const handleUserChanges = async (socket:any, message: typeof ChatMessage) => {
    // ex. adoptChangesetAttribs
    // Afaik, it copies the new attributes from the changeset, to the global Attribute Pool
-    let rebasedChangeset = Changeset.moveOpsToNewPool(changeset, wireApool, pad.pool);
+    let rebasedChangeset = moveOpsToNewPool(changeset, wireApool, pad.pool);
    // ex. applyUserChanges
    let r = baseRev;
@ -626,24 +629,24 @@ const handleUserChanges = async (socket:any, message: typeof ChatMessage) => {
      const {changeset: c, meta: {author: authorId}} = await pad.getRevision(r);
      if (changeset === c && thisSession.author === authorId) {
        // Assume this is a retransmission of an already applied changeset.
-        rebasedChangeset = Changeset.identity(Changeset.unpack(changeset).oldLen);
+        rebasedChangeset = identity(unpack(changeset).oldLen);
      }
      // At this point, both "c" (from the pad) and "changeset" (from the
      // client) are relative to revision r - 1. The follow function
      // rebases "changeset" so that it is relative to revision r
      // and can be applied after "c".
-      rebasedChangeset = Changeset.follow(c, rebasedChangeset, false, pad.pool);
+      rebasedChangeset = follow(c, rebasedChangeset, false, pad.pool);
    }
    const prevText = pad.text();
-    if (Changeset.oldLen(rebasedChangeset) !== prevText.length) {
+    if (oldLen(rebasedChangeset) !== prevText.length) {
      throw new Error(
          `Can't apply changeset ${rebasedChangeset} with oldLen ` +
-          `${Changeset.oldLen(rebasedChangeset)} to document of length ${prevText.length}`);
+          `${oldLen(rebasedChangeset)} to document of length ${prevText.length}`);
    }
-    const newRev = await pad.appendRevision(rebasedChangeset, thisSession.author);
+    const newRev = await pad.appendRevision(rebasedChangeset, thisSession.author) as number;
    // The head revision will either stay the same or increase by 1 depending on whether the
    // changeset has a net effect.
    assert([r, r + 1].includes(newRev));
@ -655,7 +658,7 @@ const handleUserChanges = async (socket:any, message: typeof ChatMessage) => {
    // Make sure the pad always ends with an empty line.
    if (pad.text().lastIndexOf('\n') !== pad.text().length - 1) {
-      const nlChangeset = Changeset.makeSplice(pad.text(), pad.text().length - 1, 0, '\n');
+      const nlChangeset = makeSplice(pad.text(), pad.text().length - 1, 0, '\n');
      await pad.appendRevision(nlChangeset, thisSession.author);
    }
@ -665,10 +668,10 @@ const handleUserChanges = async (socket:any, message: typeof ChatMessage) => {
    socket.emit('message', {type: 'COLLABROOM', data: {type: 'ACCEPT_COMMIT', newRev}});
    thisSession.rev = newRev;
    if (newRev !== r) thisSession.time = await pad.getRevisionDate(newRev);
-    await exports.updatePadClients(pad);
+    await updatePadClients(pad);
  } catch (err:any) {
    socket.emit('message', {disconnect: 'badChangeset'});
-    stats.meter('failedChangesets').mark();
+    measuredCollection.meter('failedChangesets').mark();
    messageLogger.warn(`Failed to apply USER_CHANGES from author ${thisSession.author} ` +
                       `(socket ${socket.id}) on pad ${thisSession.padId}: ${err.stack || err}`);
  } finally {
@ -676,7 +679,7 @@ const handleUserChanges = async (socket:any, message: typeof ChatMessage) => {
  }
 };
-exports.updatePadClients = async (pad: PadType) => {
+export const updatePadClients = async (pad: Pad) => {
  // skip this if no-one is on this pad
  const roomSockets = _getRoomSockets(pad.id);
  if (roomSockets.length === 0) return;
@ -710,7 +713,7 @@ exports.updatePadClients = async (pad: PadType) => {
      const revChangeset = revision.changeset;
      const currentTime = revision.meta.timestamp;
-      const forWire = Changeset.prepareForWire(revChangeset, pad.pool);
+      const forWire = prepareForWire(revChangeset, pad.pool);
      const msg = {
        type: 'COLLABROOM',
        data: {
@ -745,7 +748,7 @@ const _correctMarkersInPad = (atext: AText, apool: AttributePool) => {
  // that aren't at the start of a line
  const badMarkers = [];
  let offset = 0;
-  for (const op of Changeset.deserializeOps(atext.attribs)) {
+  for (const op of deserializeOps(atext.attribs)) {
    const attribs = AttributeMap.fromString(op.attribs, apool);
    const hasMarker = AttributeManager.lineAttributes.some((a: string) => attribs.has(a));
    if (hasMarker) {
@ -767,7 +770,7 @@ const _correctMarkersInPad = (atext: AText, apool: AttributePool) => {
  // create changeset that removes these bad markers
  offset = 0;
-  const builder = Changeset.builder(text.length);
+  const builder = new Builder(text.length);
  badMarkers.forEach((pos) => {
    builder.keepText(text.substring(offset, pos));
@ -785,26 +788,29 @@ const _correctMarkersInPad = (atext: AText, apool: AttributePool) => {
 * @param socket the socket.io Socket object for the client
 * @param message the message from the client
 */
-const handleClientReady = async (socket:any, message: typeof ChatMessage) => {
+const handleClientReady = async (socket:any, message: ClientReadyMessage) => {
  const sessionInfo = sessioninfos[socket.id];
  if (sessionInfo == null) throw new Error('client disconnected');
  assert(sessionInfo.author);
-  await hooks.aCallAll('clientReady', message); // Deprecated due to awkward context.
+  await aCallAll('clientReady', message); // Deprecated due to awkward context.
  let {colorId: authorColorId, name: authorName} = message.userInfo || {};
  // @ts-ignore
  if (authorColorId && !/^#(?:[0-9A-F]{3}){1,2}$/i.test(authorColorId)) {
    messageLogger.warn(`Ignoring invalid colorId in CLIENT_READY message: ${authorColorId}`);
    // @ts-ignore
    authorColorId = null;
  }
  await Promise.all([
-    authorName && authorManager.setAuthorName(sessionInfo.author, authorName),
+    authorName && setAuthorName(sessionInfo.author, authorName),
-    authorColorId && authorManager.setAuthorColorId(sessionInfo.author, authorColorId),
+    // @ts-ignore
    authorColorId && setAuthorColorId(sessionInfo.author, authorColorId),
  ]);
-  ({colorId: authorColorId, name: authorName} = await authorManager.getAuthor(sessionInfo.author));
+  ({colorId: authorColorId, name: authorName} = await getAuthor(sessionInfo.author));
  // load the pad-object from the database
-  const pad = await padManager.getPad(sessionInfo.padId, null, sessionInfo.author);
+  const pad = await getPad(sessionInfo.padId, null, sessionInfo.author);
  // these db requests all need the pad object (timestamp of latest revision, author data)
  const authors = pad.getAllAuthors();
@ -813,12 +819,9 @@ const handleClientReady = async (socket:any, message: typeof ChatMessage) => {
  const currentTime = await pad.getRevisionDate(pad.getHeadRevisionNumber());
  // get all author data out of the database (in parallel)
-  const historicalAuthorData:MapArrayType<{
+  const historicalAuthorData: HistoricalAuthorData = {};
    name: string;
    colorId: string;
  }> = {};
  await Promise.all(authors.map(async (authorId: string) => {
-    const author = await authorManager.getAuthor(authorId);
+    const author = await getAuthor(authorId);
    if (!author) {
      messageLogger.error(`There is no author for authorId: ${authorId}. ` +
          'This is possibly related to https://github.com/ether/etherpad-lite/issues/2802');
@ -872,7 +875,7 @@ const handleClientReady = async (socket:any, message: typeof ChatMessage) => {
    const revisionsNeeded = [];
    const changesets:MapArrayType<any> = {};
-    let startNum = message.client_rev + 1;
+    let startNum = message.client_rev! + 1;
    let endNum = pad.getHeadRevisionNumber() + 1;
    const headNum = pad.getHeadRevisionNumber();
@ -901,7 +904,7 @@ const handleClientReady = async (socket:any, message: typeof ChatMessage) => {
    // return pending changesets
    for (const r of revisionsNeeded) {
-      const forWire = Changeset.prepareForWire(changesets[r].changeset, pad.pool);
+      const forWire = prepareForWire(changesets[r].changeset, pad.pool);
      const wireMsg = {type: 'COLLABROOM',
        data: {type: 'CLIENT_RECONNECT',
          headRev: pad.getHeadRevisionNumber(),
@ -923,11 +926,11 @@ const handleClientReady = async (socket:any, message: typeof ChatMessage) => {
  } else {
    // This is a normal first connect
    let atext;
-    let apool;
+    let apool: AttributePoolWire;
    // prepare all values for the wire, there's a chance that this throws, if the pad is corrupted
    try {
-      atext = Changeset.cloneAText(pad.atext);
+      atext = cloneAText(pad.atext);
-      const attribsForWire = Changeset.prepareForWire(atext.attribs, pad.pool);
+      const attribsForWire = prepareForWire(atext.attribs, pad.pool);
      apool = attribsForWire.pool.toJsonable();
      atext.attribs = attribsForWire.translated;
    } catch (e:any) {
@ -938,10 +941,10 @@ const handleClientReady = async (socket:any, message: typeof ChatMessage) => {
    // Warning: never ever send sessionInfo.padId to the client. If the client is read only you
    // would open a security hole 1 swedish mile wide...
-    const clientVars:MapArrayType<any> = {
+    const clientVars:ClientVarPayload = {
-      skinName: settings.skinName,
+      skinName: settings.skinName!,
-      skinVariants: settings.skinVariants,
+      skinVariants: settings.skinVariants!,
-      randomVersionString: settings.randomVersionString,
+      randomVersionString: settings.randomVersionString!,
      accountPrivs: {
        maxRevisions: 100,
      },
@ -958,7 +961,7 @@ const handleClientReady = async (socket:any, message: typeof ChatMessage) => {
        rev: pad.getHeadRevisionNumber(),
        time: currentTime,
      },
-      colorPalette: authorManager.getColorPalette(),
+      colorPalette: getColorPalette(),
      clientIp: '127.0.0.1',
      userColor: authorColorId,
      padId: sessionInfo.auth.padID,
@ -979,8 +982,8 @@ const handleClientReady = async (socket:any, message: typeof ChatMessage) => {
      sofficeAvailable: settings.sofficeAvailable(),
      exportAvailable: settings.exportAvailable(),
      plugins: {
-        plugins: plugins.plugins,
+        plugins: pluginDefs.getPlugins(),
-        parts: plugins.parts,
+        parts: pluginDefs.getParts(),
      },
      indentationOnNewLine: settings.indentationOnNewLine,
      scrollWhenFocusLineIsOutOfViewport: {
@ -997,7 +1000,7 @@ const handleClientReady = async (socket:any, message: typeof ChatMessage) => {
            settings.scrollWhenFocusLineIsOutOfViewport.percentageToScrollWhenUserPressesArrowUp,
      },
      initialChangesets: [], // FIXME: REMOVE THIS SHIT,
-      mode: process.env.NODE_ENV
+      mode: process.env.NODE_ENV!
    };
    // Add a username to the clientVars if one avaiable
@ -1006,7 +1009,7 @@ const handleClientReady = async (socket:any, message: typeof ChatMessage) => {
    }
    // call the clientVars-hook so plugins can modify them before they get sent to the client
-    const messages = await hooks.aCallAll('clientVars', {clientVars, pad, socket});
+    const messages = await aCallAll('clientVars', {clientVars, pad, socket});
    // combine our old object with the new attributes from the hook
    for (const msg of messages) {
@ -1052,7 +1055,7 @@ const handleClientReady = async (socket:any, message: typeof ChatMessage) => {
    if (authorId == null) return;
    // reuse previously created cache of author's data
-    const authorInfo = historicalAuthorData[authorId] || await authorManager.getAuthor(authorId);
+    const authorInfo = historicalAuthorData[authorId] || await getAuthor(authorId);
    if (authorInfo == null) {
      messageLogger.error(
          `Author ${authorId} connected via socket.io session ${roomSocket.id} is missing from ` +
@ -1077,7 +1080,7 @@ const handleClientReady = async (socket:any, message: typeof ChatMessage) => {
    socket.emit('message', msg);
  }));
-  await hooks.aCallAll('userJoin', {
+  await aCallAll('userJoin', {
    authorId: sessionInfo.author,
    displayName: authorName,
    padId: sessionInfo.padId,
@ -1090,7 +1093,7 @@ const handleClientReady = async (socket:any, message: typeof ChatMessage) => {
 /**
 * Handles a request for a rough changeset, the timeslider client needs it
 */
-const handleChangesetRequest = async (socket:any, {data: {granularity, start, requestID}}: ChangesetRequest) => {
+const handleChangesetRequest = async (socket:any, {data: {granularity, start, requestID}}: ChangesetRequestMessage) => {
  if (granularity == null) throw new Error('missing granularity');
  if (!Number.isInteger(granularity)) throw new Error('granularity is not an integer');
  if (start == null) throw new Error('missing start');
@ -1098,7 +1101,7 @@ const handleChangesetRequest = async (socket:any, {data: {granularity, start, re
  if (requestID == null) throw new Error('mising requestID');
  const end = start + (100 * granularity);
  const {padId, author: authorId} = sessioninfos[socket.id];
-  const pad = await padManager.getPad(padId, null, authorId);
+  const pad = await getPad(padId, null, authorId);
  const headRev = pad.getHeadRevisionNumber();
  if (start > headRev)
    start = headRev;
@ -1111,7 +1114,7 @@ const handleChangesetRequest = async (socket:any, {data: {granularity, start, re
 * Tries to rebuild the getChangestInfo function of the original Etherpad
 * https://github.com/ether/pad/blob/master/etherpad/src/etherpad/control/pad/pad_changeset_control.js#L144
 */
-const getChangesetInfo = async (pad: PadType, startNum: number, endNum:number, granularity: number) => {
+const getChangesetInfo = async (pad: Pad, startNum: number, endNum:number, granularity: number) => {
  const headRevision = pad.getHeadRevisionNumber();
  // calculate the last full endnum
@ -1163,13 +1166,13 @@ const getChangesetInfo = async (pad: PadType, startNum: number, endNum:number, g
    if (compositeEnd > endNum || compositeEnd > headRevision + 1) break;
    const forwards = composedChangesets[`${compositeStart}/${compositeEnd}`];
-    const backwards = Changeset.inverse(forwards, lines.textlines, lines.alines, pad.apool());
+    const backwards = inverse(forwards, lines.textlines, lines.alines, pad.apool());
-    Changeset.mutateAttributionLines(forwards, lines.alines, pad.apool());
+    new AttributionLinesMutator(forwards, lines.alines, pad.apool());
-    Changeset.mutateTextLines(forwards, lines.textlines);
+    mutateTextLines(forwards, lines.textlines);
-    const forwards2 = Changeset.moveOpsToNewPool(forwards, pad.apool(), apool);
+    const forwards2 = moveOpsToNewPool(forwards, pad.apool(), apool);
-    const backwards2 = Changeset.moveOpsToNewPool(backwards, pad.apool(), apool);
+    const backwards2 = moveOpsToNewPool(backwards, pad.apool(), apool);
    const t1 = (compositeStart === 0) ? revisionDate[0] : revisionDate[compositeStart - 1];
    const t2 = revisionDate[compositeEnd - 1];
@ -1188,19 +1191,19 @@ const getChangesetInfo = async (pad: PadType, startNum: number, endNum:number, g
 * Tries to rebuild the getPadLines function of the original Etherpad
 * https://github.com/ether/pad/blob/master/etherpad/src/etherpad/control/pad/pad_changeset_control.js#L263
 */
-const getPadLines = async (pad: PadType, revNum: number) => {
+const getPadLines = async (pad: Pad, revNum: number) => {
  // get the atext
  let atext;
  if (revNum >= 0) {
    atext = await pad.getInternalRevisionAText(revNum);
  } else {
-    atext = Changeset.makeAText('\n');
+    atext = makeAText('\n');
  }
  return {
-    textlines: Changeset.splitTextLines(atext.text),
+    textlines: splitTextLines(atext.text),
-    alines: Changeset.splitAttributionLines(atext.attribs, atext.text),
+    alines: splitAttributionLines(atext.attribs, atext.text),
  };
 };
@ -1208,7 +1211,7 @@ const getPadLines = async (pad: PadType, revNum: number) => {
 * Tries to rebuild the composePadChangeset function of the original Etherpad
 * https://github.com/ether/pad/blob/master/etherpad/src/etherpad/control/pad/pad_changeset_control.js#L241
 */
-const composePadChangesets = async (pad: PadType, startNum: number, endNum: number) => {
+const composePadChangesets = async (pad: Pad, startNum: number, endNum: number) => {
  // fetch all changesets we need
  const headNum = pad.getHeadRevisionNumber();
  endNum = Math.min(endNum, headNum + 1);
@ -1235,7 +1238,7 @@ const composePadChangesets = async (pad: PadType, startNum: number, endNum: numb
    for (r = startNum + 1; r < endNum; r++) {
      const cs = changesets[r];
-      changeset = Changeset.compose(changeset, cs, pool);
+      changeset = compose(changeset, cs, pool);
    }
    return changeset;
  } catch (e) {
@ -1247,7 +1250,7 @@ const composePadChangesets = async (pad: PadType, startNum: number, endNum: numb
 };
 const _getRoomSockets = (padID: string) => {
-  const ns = socketio.sockets; // Default namespace.
+  const ns = _socketio.sockets; // Default namespace.
  // We could call adapter.clients(), but that method is unnecessarily asynchronous. Replicate what
  // it does here, but synchronously to avoid a race condition. This code will have to change when
  // we update to socket.io v3.
@ -1263,21 +1266,21 @@ const _getRoomSockets = (padID: string) => {
 /**
 * Get the number of users in a pad
 */
-exports.padUsersCount = (padID:string) => ({
+export const padUsersCount = (padID:string) => ({
  padUsersCount: _getRoomSockets(padID).length,
 });
 /**
 * Get the list of users in a pad
 */
-exports.padUsers = async (padID: string) => {
+export const padUsers = async (padID: string) => {
  const padUsers:PadAuthor[] = [];
  // iterate over all clients (in parallel)
  await Promise.all(_getRoomSockets(padID).map(async (roomSocket) => {
    const s = sessioninfos[roomSocket.id];
    if (s) {
-      const author = await authorManager.getAuthor(s.author);
+      const author = await getAuthor(s.author);
      // Fixes: https://github.com/ether/etherpad-lite/issues/4120
      // On restart author might not be populated?
      if (author) {
@ -1289,5 +1292,3 @@ exports.padUsers = async (padID: string) => {
  return {padUsers};
 };
 exports.sessioninfos = sessioninfos;
--- a/src/node/hooks/express.ts
+++ b/src/node/hooks/express.ts
@ -1,49 +1,50 @@
 'use strict';
 import {Socket} from "node:net";
 import type {MapArrayType} from "../types/MapType";
 import _ from 'underscore';
 // @ts-ignore
 import cookieParser from 'cookie-parser';
 import events from 'events';
 import express from 'express';
 // @ts-ignore
 import expressSession from '@etherpad/express-session';
 import fs from 'fs';
-const hooks = require('../../static/js/pluginfw/hooks');
+import {aCallAll} from '../../static/js/pluginfw/hooks';
 import log4js from 'log4js';
-const SessionStore = require('../db/SessionStore');
+import SessionStore from '../db/SessionStore';
-const settings = require('../utils/Settings');
+import settings from '../utils/Settings';
-const stats = require('../stats')
+import {measuredCollection} from '../stats';
 import util from 'util';
-const webaccess = require('./express/webaccess');
+import {checkAccess} from './express/webaccess';
 import SecretRotator from '../security/SecretRotator';
 import {Server, Socket} from "socket.io";
 import {DefaultEventsMap} from "socket.io/dist/typed-events";
 let secretRotator: SecretRotator|null = null;
 const logger = log4js.getLogger('http');
 let serverName:string;
 let sessionStore: { shutdown: () => void; } | null;
-const sockets:Set<Socket> = new Set();
+const sockets:Set< Socket<DefaultEventsMap, DefaultEventsMap, DefaultEventsMap, any>> = new Set();
 const socketsEvents = new events.EventEmitter();
-const startTime = stats.settableGauge('httpStartTime');
+const startTime = measuredCollection.settableGauge('httpStartTime');
 exports.server = null;
 const closeServer = async () => {
-  if (exports.server != null) {
+  if (server != null) {
    logger.info('Closing HTTP server...');
-    // Call exports.server.close() to reject new connections but don't await just yet because the
+    // Call server.close() to reject new connections but don't await just yet because the
    // Promise won't resolve until all preexisting connections are closed.
-    const p = util.promisify(exports.server.close.bind(exports.server))();
+    const p = util.promisify(server.close.bind(server))();
-    await hooks.aCallAll('expressCloseServer');
+    await aCallAll('expressCloseServer');
    // Give existing connections some time to close on their own before forcibly terminating. The
    // time should be long enough to avoid interrupting most preexisting transmissions but short
    // enough to avoid a noticeable outage.
    const timeout = setTimeout(async () => {
      logger.info(`Forcibly terminating remaining ${sockets.size} HTTP connections...`);
-      for (const socket of sockets) socket.destroy(new Error('HTTP server is closing'));
+      for (const socket of sockets) { // @ts-ignore
        socket.destroy(new Error('HTTP server is closing'));
      }
    }, 5000);
    let lastLogged = 0;
    while (sockets.size > 0  && !settings.enableAdminUITests) {
@ -55,7 +56,7 @@ const closeServer = async () => {
    }
    await p;
    clearTimeout(timeout);
-    exports.server = null;
+    server = null;
    startTime.setValue(0);
    logger.info('HTTP server closed');
  }
@ -65,14 +66,14 @@ const closeServer = async () => {
  secretRotator = null;
 };
-exports.createServer = async () => {
+export const createServer = async () => {
  console.log('Report bugs at https://github.com/ether/etherpad-lite/issues');
  serverName = `Etherpad ${settings.getGitCommit()} (https://etherpad.org)`;
  console.log(`Your Etherpad version is ${settings.getEpVersion()} (${settings.getGitCommit()})`);
-  await exports.restartServer();
+  await restartServer();
  if (settings.ip === '') {
    // using Unix socket for connectivity
@ -97,7 +98,10 @@ exports.createServer = async () => {
  }
 };
-exports.restartServer = async () => {
+export let server: Server|null = null;
 export let sessionMiddleware:any
 export const restartServer = async () => {
  await closeServer();
  const app = express(); // New syntax for express v3
@ -121,10 +125,11 @@ exports.restartServer = async () => {
    }
    const https = require('https');
-    exports.server = https.createServer(options, app);
+
    server = https.createServer(options, app);
  } else {
    const http = require('http');
-    exports.server = http.createServer(app);
+    server = http.createServer(app);
  }
  app.use((req, res, next) => {
@ -167,7 +172,7 @@ exports.restartServer = async () => {
  // Measure response time
  app.use((req, res, next) => {
-    const stopWatch = stats.timer('httpRequests').start();
+    const stopWatch = measuredCollection.timer('httpRequests').start();
    const sendFn = res.send.bind(res);
    res.send = (...args) => {   stopWatch.end(); return sendFn(...args); };
    next();
@ -177,7 +182,8 @@ exports.restartServer = async () => {
  // starts listening to requests as reported in issue #158. Not installing the log4js connect
  // logger when the log level has a higher severity than INFO since it would not log at that level
  // anyway.
-  if (!(settings.loglevel === 'WARN' && settings.loglevel === 'ERROR')) {
+  // @ts-ignore
  if (!(loglevel === 'WARN' && loglevel === 'ERROR')) {
    app.use(log4js.connectLogger(logger, {
      level: log4js.levels.DEBUG.levelStr,
      format: ':status, :method :url',
@ -185,7 +191,7 @@ exports.restartServer = async () => {
  }
  const {keyRotationInterval, sessionLifetime} = settings.cookie;
-  let secret = settings.sessionKey;
+  let secret: string|string[] = settings.sessionKey!;
  if (keyRotationInterval && sessionLifetime) {
    secretRotator = new SecretRotator(
        'expressSessionSecrets', keyRotationInterval, sessionLifetime, settings.sessionKey);
@ -197,7 +203,7 @@ exports.restartServer = async () => {
  app.use(cookieParser(secret, {}));
  sessionStore = new SessionStore(settings.cookie.sessionRefreshInterval);
-  exports.sessionMiddleware = expressSession({
+  sessionMiddleware = expressSession({
    propagateTouch: true,
    rolling: true,
    secret,
@ -234,16 +240,16 @@ exports.restartServer = async () => {
  // Give plugins an opportunity to install handlers/middleware before the express-session
  // middleware. This allows plugins to avoid creating an express-session record in the database
  // when it is not needed (e.g., public static content).
-  await hooks.aCallAll('expressPreSession', {app});
+  await aCallAll('expressPreSession', {app});
-  app.use(exports.sessionMiddleware);
+  app.use(sessionMiddleware);
-  app.use(webaccess.checkAccess);
+  app.use(checkAccess);
  await Promise.all([
-    hooks.aCallAll('expressConfigure', {app}),
+    aCallAll('expressConfigure', {app}),
-    hooks.aCallAll('expressCreateServer', {app, server: exports.server}),
+    aCallAll('expressCreateServer', {app, server: server}),
  ]);
-  exports.server.on('connection', (socket:Socket) => {
+  server!.on('connection', (socket) => {
    sockets.add(socket);
    socketsEvents.emit('updated');
    socket.on('close', () => {
@ -251,11 +257,12 @@ exports.restartServer = async () => {
      socketsEvents.emit('updated');
    });
  });
-  await util.promisify(exports.server.listen).bind(exports.server)(settings.port, settings.ip);
+  // @ts-ignore
  await util.promisify(server!.listen).bind(server)(port, ip);
  startTime.setValue(Date.now());
  logger.info('HTTP server listening for connections');
 };
-exports.shutdown = async (hookName:string, context: any) => {
+export const shutdown = async (hookName:string, context: any) => {
  await closeServer();
 };
--- a/src/node/hooks/express/tests.ts
+++ b/src/node/hooks/express/tests.ts
@ -3,10 +3,10 @@
 import {Dirent} from "node:fs";
 import {PluginDef} from "../../types/PartType";
-const path = require('path');
+import path from 'path';
-const fsp = require('fs').promises;
+import {promises as fsp} from 'fs';
-const plugins = require('../../../static/js/pluginfw/plugin_defs');
+import {pluginDefs} from '../../../static/js/pluginfw/plugin_defs';
-const sanitizePathname = require('../../utils/sanitizePathname');
+import sanitizePathname from '../../utils/sanitizePathname';
 const settings = require('../../utils/Settings');
 // Returns all *.js files under specDir (recursively) as relative paths to specDir, using '/'
@ -32,11 +32,11 @@ const findSpecs = async (specDir: string) => {
  return specs;
 };
-exports.expressPreSession = async (hookName:string, {app}:any) => {
+export const expressPreSession = async (hookName:string, {app}:any) => {
  app.get('/tests/frontend/frontendTestSpecs.json', (req:any, res:any, next:Function) => {
    (async () => {
      const modules:string[] = [];
-      await Promise.all(Object.entries(plugins.plugins).map(async ([plugin, def]) => {
+      await Promise.all(Object.entries(pluginDefs.getPlugins()).map(async ([plugin, def]) => {
        let {package: {path: pluginPath}} = def as PluginDef;
        if (!pluginPath.endsWith(path.sep)) pluginPath += path.sep;
        const specDir = `${plugin === 'ep_etherpad-lite' ? '' : 'static/'}tests/frontend/specs`;
--- a/src/node/hooks/express/webaccess.ts
+++ b/src/node/hooks/express/webaccess.ts
@ -7,21 +7,19 @@ import {WebAccessTypes} from "../../types/WebAccessTypes";
 import {SettingsUser} from "../../types/SettingsUser";
 const httpLogger = log4js.getLogger('http');
 const settings = require('../../utils/Settings');
-const hooks = require('../../../static/js/pluginfw/hooks');
+import {deprecationNotices, aCallFirst as HookAcall} from '../../../static/js/pluginfw/hooks';
 const readOnlyManager = require('../../db/ReadOnlyManager');
-hooks.deprecationNotices.authFailure = 'use the authnFailure and authzFailure hooks instead';
+deprecationNotices.authFailure = 'use the authnFailure and authzFailure hooks instead';
 // Promisified wrapper around hooks.aCallFirst.
 const aCallFirst = (hookName: string, context:any, pred = null) => new Promise((resolve, reject) => {
-  hooks.aCallFirst(hookName, context, (err:any, r: unknown) => err != null ? reject(err) : resolve(r), pred);
+  HookAcall(hookName, context, (err:any, r: unknown) => err != null ? reject(err) : resolve(r), pred)
 });
-const aCallFirst0 =
+const aCallFirst0 = async (hookName: string, context:any, pred = null): Promise<any> => (await aCallFirst(hookName, context, pred)) as any[0];
    // @ts-ignore
    async (hookName: string, context:any, pred = null) => (await aCallFirst(hookName, context, pred))[0];
-exports.normalizeAuthzLevel = (level: string|boolean) => {
+export const normalizeAuthzLevel = (level: string|boolean) => {
  if (!level) return false;
  switch (level) {
    case true:
@ -36,20 +34,20 @@ exports.normalizeAuthzLevel = (level: string|boolean) => {
  return false;
 };
-exports.userCanModify = (padId: string, req: SocketClientRequest) => {
+export const userCanModify = (padId: string, req: SocketClientRequest) => {
  if (readOnlyManager.isReadOnlyId(padId)) return false;
  if (!settings.requireAuthentication) return true;
  const {session: {user} = {}} = req;
  if (!user || user.readOnly) return false;
  assert(user.padAuthorizations); // This is populated even if !settings.requireAuthorization.
-  const level = exports.normalizeAuthzLevel(user.padAuthorizations[padId]);
+  const level = normalizeAuthzLevel(user.padAuthorizations[padId]);
  return level && level !== 'readOnly';
 };
 // Exported so that tests can set this to 0 to avoid unnecessary test slowness.
-exports.authnFailureDelayMs = 1000;
+export const authnFailureDelayMs = 1000;
-const checkAccess = async (req:any, res:any, next: Function) => {
+const _checkAccess = async (req:any, res:any, next: Function) => {
  const requireAdmin = req.path.toLowerCase().startsWith('/admin-auth');
  // ///////////////////////////////////////////////////////////////////////////////////////////////
@ -93,7 +91,7 @@ const checkAccess = async (req:any, res:any, next: Function) => {
  // authentication is checked and once after (if settings.requireAuthorization is true).
  const authorize = async () => {
    const grant = async (level: string|false) => {
-      level = exports.normalizeAuthzLevel(level);
+      level = normalizeAuthzLevel(level);
      if (!level) return false;
      const user = req.session.user;
      if (user == null) return true; // This will happen if authentication is not required.
@ -173,7 +171,7 @@ const checkAccess = async (req:any, res:any, next: Function) => {
        res.header('WWW-Authenticate', 'Basic realm="Protected Area"');
      }
      // Delay the error response for 1s to slow down brute force attacks.
-      await new Promise((resolve) => setTimeout(resolve, exports.authnFailureDelayMs));
+      await new Promise((resolve) => setTimeout(resolve, authnFailureDelayMs));
      res.status(401).send('Authentication Required');
      return;
    }
@ -213,6 +211,6 @@ const checkAccess = async (req:any, res:any, next: Function) => {
 * Express middleware to authenticate the user and check authorization. Must be installed after the
 * express-session middleware.
 */
-exports.checkAccess = (req:any, res:any, next:Function) => {
+export const checkAccess = (req:any, res:any, next:Function) => {
-  checkAccess(req, res, next).catch((err) => next(err || new Error(err)));
+  _checkAccess(req, res, next).catch((err) => next(err || new Error(err)));
 };
--- a/src/node/padaccess.ts
+++ b/src/node/padaccess.ts
@ -1,10 +1,10 @@
 'use strict';
-const securityManager = require('./db/SecurityManager');
+import {checkAccess} from './db/SecurityManager';
 // checks for padAccess
-module.exports = async (req: { params?: any; cookies?: any; session?: any; }, res: { status: (arg0: number) => { (): any; new(): any; send: { (arg0: string): void; new(): any; }; }; }) => {
+export default async (req: { params?: any; cookies?: any; session?: any; }, res: { status: (arg0: number) => { (): any; new(): any; send: { (arg0: string): void; new(): any; }; }; }) => {
  const {session: {user} = {}} = req;
-  const accessObj = await securityManager.checkAccess(
+  const accessObj = await checkAccess(
      req.params.pad, req.cookies.sessionID, req.cookies.token, user);
  if (accessObj.accessStatus === 'grant') {
--- a/src/node/server.ts
+++ b/src/node/server.ts
@ -28,8 +28,7 @@ import log4js from 'log4js';
 import pkg from '../package.json';
 import {checkForMigration} from "../static/js/pluginfw/installer";
 import axios from "axios";
-
+import settings from "./utils/Settings";
 const settings = require('./utils/Settings');
 let wtfnode: any;
 if (settings.dumpOnUncleanExit) {
@ -64,18 +63,18 @@ if (process.env['https_proxy']) {
 * early check for version compatibility before calling
 * any modules that require newer versions of NodeJS
 */
-const NodeVersion = require('./utils/NodeVersion');
+import {checkDeprecationStatus, enforceMinNodeVersion} from './utils/NodeVersion';
-NodeVersion.enforceMinNodeVersion(pkg.engines.node.replace(">=", ""));
+enforceMinNodeVersion(pkg.engines.node.replace(">=", ""));
-NodeVersion.checkDeprecationStatus(pkg.engines.node.replace(">=", ""), '2.1.0');
+checkDeprecationStatus(pkg.engines.node.replace(">=", ""), '2.1.0');
-const UpdateCheck = require('./utils/UpdateCheck');
+import {check} from './utils/UpdateCheck';
-const db = require('./db/DB');
+import {init} from './db/DB';
-const express = require('./hooks/express');
+import {server} from './hooks/express';
-const hooks = require('../static/js/pluginfw/hooks');
+import {aCallAll} from '../static/js/pluginfw/hooks';
-const pluginDefs = require('../static/js/pluginfw/plugin_defs');
+import {pluginDefs} from '../static/js/pluginfw/plugin_defs';
-const plugins = require('../static/js/pluginfw/plugins');
+import {formatHooks, formatParts, update} from '../static/js/pluginfw/plugins';
-const {Gate} = require('./utils/promises');
+import {Gate} from './utils/promises';
-const stats = require('./stats')
+import {measuredCollection} from './stats';
 const logger = log4js.getLogger('server');
@ -100,17 +99,17 @@ const removeSignalListener = (signal: NodeJS.Signals, listener: NodeJS.SignalsLi
 };
-let startDoneGate: { resolve: () => void; }
+let startDoneGate: Gate<void>
-exports.start = async () => {
+export const start = async (): Promise<any> => {
  switch (state) {
    case State.INITIAL:
      break;
    case State.STARTING:
      await startDoneGate;
      // Retry. Don't fall through because it might have transitioned to STATE_TRANSITION_FAILED.
-      return await exports.start();
+      return await start();
    case State.RUNNING:
-      return express.server;
+      return server;
    case State.STOPPING:
    case State.STOPPED:
    case State.EXITING:
@ -121,22 +120,20 @@ exports.start = async () => {
      throw new Error(`unknown State: ${state.toString()}`);
  }
  logger.info('Starting Etherpad...');
-  startDoneGate = new Gate();
+  startDoneGate = new Gate<void>();
  state = State.STARTING;
  try {
    // Check if Etherpad version is up-to-date
-    UpdateCheck.check();
+    check();
-    // @ts-ignore
+    measuredCollection.gauge('memoryUsage', () => process.memoryUsage().rss);
-    stats.gauge('memoryUsage', () => process.memoryUsage().rss);
+    measuredCollection.gauge('memoryUsageHeap', () => process.memoryUsage().heapUsed);
    // @ts-ignore
    stats.gauge('memoryUsageHeap', () => process.memoryUsage().heapUsed);
    process.on('uncaughtException', (err: ErrorCaused) => {
      logger.debug(`uncaught exception: ${err.stack || err}`);
      // eslint-disable-next-line promise/no-promise-in-callback
-      exports.exit(err)
+      exit(err)
          .catch((err: ErrorCaused) => {
            logger.error('Error in process exit', err);
            // eslint-disable-next-line n/no-process-exit
@ -153,12 +150,12 @@ exports.start = async () => {
    for (const signal of ['SIGINT', 'SIGTERM'] as NodeJS.Signals[]) {
      // Forcibly remove other signal listeners to prevent them from terminating node before we are
      // done cleaning up. See https://github.com/andywer/threads.js/pull/329 for an example of a
-      // problematic listener. This means that exports.exit is solely responsible for performing all
+      // problematic listener. This means that exit is solely responsible for performing all
      // necessary cleanup tasks.
      for (const listener of process.listeners(signal)) {
        removeSignalListener(signal, listener);
      }
-      process.on(signal, exports.exit);
+      process.on(signal, exit);
      // Prevent signal listeners from being added in the future.
      process.on('newListener', (event, listener) => {
        if (event !== signal) return;
@ -166,40 +163,40 @@ exports.start = async () => {
      });
    }
-    await db.init();
+    await init();
    await checkForMigration();
-    await plugins.update();
+    await update();
-    const installedPlugins = (Object.values(pluginDefs.plugins) as PluginType[])
+    const installedPlugins = (Object.values(pluginDefs.getPlugins()) as PluginType[])
        .filter((plugin) => plugin.package.name !== 'ep_etherpad-lite')
        .map((plugin) => `${plugin.package.name}@${plugin.package.version}`)
        .join(', ');
    logger.info(`Installed plugins: ${installedPlugins}`);
-    logger.debug(`Installed parts:\n${plugins.formatParts()}`);
+    logger.debug(`Installed parts:\n${formatParts()}`);
-    logger.debug(`Installed server-side hooks:\n${plugins.formatHooks('hooks', false)}`);
+    logger.debug(`Installed server-side hooks:\n${formatHooks('hooks', false)}`);
-    await hooks.aCallAll('loadSettings', {settings});
+    await aCallAll('loadSettings', {settings});
-    await hooks.aCallAll('createServer');
+    await aCallAll('createServer');
  } catch (err) {
    logger.error('Error occurred while starting Etherpad');
    state = State.STATE_TRANSITION_FAILED;
-    startDoneGate.resolve();
+    startDoneGate.resolve!();
-    return await exports.exit(err);
+    return await exit(err as any);
  }
  logger.info('Etherpad is running');
  state = State.RUNNING;
-  startDoneGate.resolve();
+  startDoneGate.resolve!();
  // Return the HTTP server to make it easier to write tests.
-  return express.server;
+  return server;
 };
 const stopDoneGate = new Gate();
-exports.stop = async () => {
+export const stop = async (): Promise<void> => {
  switch (state) {
    case State.STARTING:
-      await exports.start();
+      await start();
      // Don't fall through to State.RUNNING in case another caller is also waiting for startup.
-      return await exports.stop();
+      return await stop();
    case State.RUNNING:
      break;
    case State.STOPPING:
@ -219,7 +216,7 @@ exports.stop = async () => {
  try {
    let timeout: NodeJS.Timeout = null as unknown as NodeJS.Timeout;
    await Promise.race([
-      hooks.aCallAll('shutdown'),
+      aCallAll('shutdown'),
      new Promise((resolve, reject) => {
        timeout = setTimeout(() => reject(new Error('Timed out waiting for shutdown tasks')), 3000);
      }),
@ -228,24 +225,25 @@ exports.stop = async () => {
  } catch (err) {
    logger.error('Error occurred while stopping Etherpad');
    state = State.STATE_TRANSITION_FAILED;
-    stopDoneGate.resolve();
+    stopDoneGate.resolve!();
-    return await exports.exit(err);
+    // @ts-ignore
    return await exit(err);
  }
  logger.info('Etherpad stopped');
  state = State.STOPPED;
-  stopDoneGate.resolve();
+  stopDoneGate.resolve!();
 };
 let exitGate: any;
 let exitCalled = false;
-exports.exit = async (err: ErrorCaused|string|null = null) => {
+export const exit = async (err: ErrorCaused|string|null = null): Promise<void> => {
  /* eslint-disable no-process-exit */
  if (err === 'SIGTERM') {
    // Termination from SIGTERM is not treated as an abnormal termination.
    logger.info('Received SIGTERM signal');
    err = null;
  } else if (typeof err == "object" && err != null) {
-    logger.error(`Metrics at time of fatal error:\n${JSON.stringify(stats.toJSON(), null, 2)}`);
+    logger.error(`Metrics at time of fatal error:\n${JSON.stringify(measuredCollection.toJSON(), null, 2)}`);
    logger.error(err.stack || err.toString());
    process.exitCode = 1;
    if (exitCalled) {
@ -259,11 +257,11 @@ exports.exit = async (err: ErrorCaused|string|null = null) => {
    case State.STARTING:
    case State.RUNNING:
    case State.STOPPING:
-      await exports.stop();
+      await stop();
      // Don't fall through to State.STOPPED in case another caller is also waiting for stop().
      // Don't pass err to exports.exit() because this err has already been processed. (If err is
      // passed again to exit() then exit() will think that a second error occurred while exiting.)
-      return await exports.exit();
+      return await exit();
    case State.INITIAL:
    case State.STOPPED:
    case State.STATE_TRANSITION_FAILED:
@ -303,7 +301,7 @@ exports.exit = async (err: ErrorCaused|string|null = null) => {
  /* eslint-enable no-process-exit */
 };
-if (require.main === module) exports.start();
+if (require.main === module) start();
 // @ts-ignore
-if (typeof(PhusionPassenger) !== 'undefined') exports.start();
+if (typeof(PhusionPassenger) !== 'undefined') start();
--- a/src/node/stats.ts
+++ b/src/node/stats.ts
@ -2,9 +2,8 @@
 const measured = require('measured-core');
-module.exports = measured.createCollection();
+export const measuredCollection = measured.createCollection();
-// @ts-ignore
+export const shutdown = async (hookName: string, context:any) => {
-module.exports.shutdown = async (hookName, context) => {
+  measuredCollection.end();
  module.exports.end();
 };
--- a/src/node/types/RunCMDOptions.ts
+++ b/src/node/types/RunCMDOptions.ts
@ -1,6 +1,6 @@
 export type RunCMDOptions = {
    cwd?: string,
-    stdio?: string[],
+    stdio?: string[]|null[],
    env?: NodeJS.ProcessEnv
 }
--- a/src/node/types/SocketClientRequest.ts
+++ b/src/node/types/SocketClientRequest.ts
@ -1,3 +1,5 @@
 import {UserSettingsObject} from "./UserSettingsObject";
 export type SocketClientRequest = {
    session: {
        user: {
@ -5,6 +7,7 @@ export type SocketClientRequest = {
            readOnly: boolean;
            padAuthorizations: {
                [key: string]: string;
                user: UserSettingsObject
            }
        }
    }
--- a/src/node/utils/Abiword.ts
+++ b/src/node/utils/Abiword.ts
@ -22,15 +22,17 @@
 import {ChildProcess} from "node:child_process";
 import {AsyncQueueTask} from "../types/AsyncQueueTask";
-const spawn = require('child_process').spawn;
+import {spawn} from 'child_process'
-const async = require('async');
+import async from 'async';
 const settings = require('./Settings');
-const os = require('os');
+import os from 'os';
 export let convertFile: (srcFile: string,     destFile: string,     type: string)=> Promise<void>
 // on windows we have to spawn a process for each convertion,
 // cause the plugin abicommand doesn't exist on this platform
 if (os.type().indexOf('Windows') > -1) {
-  exports.convertFile = async (srcFile: string, destFile: string, type: string) => {
+  convertFile = async (srcFile: string, destFile: string, type: string) => {
    const abiword = spawn(settings.abiword, [`--to=${destFile}`, srcFile]);
    let stdoutBuffer = '';
    abiword.stdout.on('data', (data: string) => { stdoutBuffer += data.toString(); });
@ -87,7 +89,7 @@ if (os.type().indexOf('Windows') > -1) {
    };
  }, 1);
-  exports.convertFile = async (srcFile: string, destFile: string, type: string) => {
+  convertFile = async (srcFile: string, destFile: string, type: string) => {
    await queue.pushAsync({srcFile, destFile, type});
  };
 }
--- a/src/node/utils/AbsolutePaths.ts
+++ b/src/node/utils/AbsolutePaths.ts
@ -18,9 +18,9 @@
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
-const log4js = require('log4js');
+import log4js from 'log4js';
-const path = require('path');
+import path from 'path';
-const _ = require('underscore');
+import _ from 'underscore';
 const absPathLogger = log4js.getLogger('AbsolutePaths');
@ -74,7 +74,7 @@ const popIfEndsWith = (stringArray: string[], lastDesiredElements: string[]): st
 * @return {string} The identified absolute base path. If such path cannot be
 *                  identified, prints a log and exits the application.
 */
-exports.findEtherpadRoot = () => {
+export const findEtherpadRoot = () => {
  if (etherpadRoot != null) {
    return etherpadRoot;
  }
@ -130,12 +130,12 @@ exports.findEtherpadRoot = () => {
 *                  it is returned unchanged. Otherwise it is interpreted
 *                  relative to exports.root.
 */
-exports.makeAbsolute = (somePath: string) => {
+export const makeAbsolute = (somePath: string) => {
  if (path.isAbsolute(somePath)) {
    return somePath;
  }
-  const rewrittenPath = path.join(exports.findEtherpadRoot(), somePath);
+  const rewrittenPath = path.join(findEtherpadRoot(), somePath);
  absPathLogger.debug(`Relative path "${somePath}" can be rewritten to "${rewrittenPath}"`);
  return rewrittenPath;
@ -149,7 +149,7 @@ exports.makeAbsolute = (somePath: string) => {
 *                                 a subdirectory of the base one
 * @return {boolean}
 */
-exports.isSubdir = (parent: string, arbitraryDir: string): boolean => {
+export const isSubdir = (parent: string, arbitraryDir: string): boolean => {
  // modified from: https://stackoverflow.com/questions/37521893/determine-if-a-path-is-subdirectory-of-another-in-node-js#45242825
  const relative = path.relative(parent, arbitraryDir);
  return !!relative && !relative.startsWith('..') && !path.isAbsolute(relative);
--- a/src/node/utils/Cli.ts
+++ b/src/node/utils/Cli.ts
@ -21,7 +21,9 @@
 */
 // An object containing the parsed command-line options
-exports.argv = {};
+import {MapArrayType} from "../types/MapType";
 export const argvP: MapArrayType<any> = {};
 const argv = process.argv.slice(2);
 let arg, prevArg;
@ -32,22 +34,22 @@ for (let i = 0; i < argv.length; i++) {
  // Override location of settings.json file
  if (prevArg === '--settings' || prevArg === '-s') {
-    exports.argv.settings = arg;
+    argvP.settings = arg;
  }
  // Override location of credentials.json file
  if (prevArg === '--credentials') {
-    exports.argv.credentials = arg;
+    argvP.credentials = arg;
  }
  // Override location of settings.json file
  if (prevArg === '--sessionkey') {
-    exports.argv.sessionkey = arg;
+    argvP.sessionkey = arg;
  }
  // Override location of APIKEY.txt file
  if (prevArg === '--apikey') {
-    exports.argv.apikey = arg;
+    argvP.apikey = arg;
  }
  prevArg = arg;
--- a/src/node/utils/ExportEtherpad.ts
+++ b/src/node/utils/ExportEtherpad.ts
@ -15,35 +15,36 @@
 * limitations under the License.
 */
-const Stream = require('./Stream');
+import Stream from './Stream';
-const assert = require('assert').strict;
+import {strict as assert} from 'assert'
-const authorManager = require('../db/AuthorManager');
+import {getAuthor} from '../db/AuthorManager';
-const hooks = require('../../static/js/pluginfw/hooks');
+import {aCallAll} from '../../static/js/pluginfw/hooks';
-const padManager = require('../db/PadManager');
+import {getPad} from '../db/PadManager';
 import {findKeys, get} from "../db/DB";
-exports.getPadRaw = async (padId:string, readOnlyId:string) => {
+export const getPadRaw = async (padId:string, readOnlyId:string) => {
  const dstPfx = `pad:${readOnlyId || padId}`;
  const [pad, customPrefixes] = await Promise.all([
-    padManager.getPad(padId),
+    getPad(padId),
-    hooks.aCallAll('exportEtherpadAdditionalContent'),
+    aCallAll('exportEtherpadAdditionalContent'),
  ]);
  const pluginRecords = await Promise.all(customPrefixes.map(async (customPrefix:string) => {
    const srcPfx = `${customPrefix}:${padId}`;
    const dstPfx = `${customPrefix}:${readOnlyId || padId}`;
    assert(!srcPfx.includes('*'));
-    const srcKeys = await pad.db.findKeys(`${srcPfx}:*`, null);
+    const srcKeys = await findKeys(`${srcPfx}:*`, null);
    return (function* () {
-      yield [dstPfx, pad.db.get(srcPfx)];
+      yield [dstPfx, get(srcPfx)];
      for (const k of srcKeys) {
        assert(k.startsWith(`${srcPfx}:`));
-        yield [`${dstPfx}${k.slice(srcPfx.length)}`, pad.db.get(k)];
+        yield [`${dstPfx}${k.slice(srcPfx.length)}`, get(k)];
      }
    })();
  }));
  const records = (function* () {
    for (const authorId of pad.getAllAuthors()) {
      yield [`globalAuthor:${authorId}`, (async () => {
-        const authorEntry = await authorManager.getAuthor(authorId);
+        const authorEntry = await getAuthor(authorId);
        if (!authorEntry) return undefined; // Becomes unset when converted to JSON.
        if (authorEntry.padIDs) authorEntry.padIDs = readOnlyId || padId;
        return authorEntry;
@ -55,7 +56,7 @@ exports.getPadRaw = async (padId:string, readOnlyId:string) => {
  })();
  const data = {[dstPfx]: pad};
  for (const [dstKey, p] of new Stream(records).batch(100).buffer(99)) data[dstKey] = await p;
-  await hooks.aCallAll('exportEtherpad', {
+  await aCallAll('exportEtherpad', {
    pad,
    data,
    dstPadId: readOnlyId || padId,
--- a/src/node/utils/ExportHelper.ts
+++ b/src/node/utils/ExportHelper.ts
@ -21,17 +21,17 @@
 import AttributeMap from '../../static/js/AttributeMap';
 import AttributePool from "../../static/js/AttributePool";
-const Changeset = require('../../static/js/Changeset');
+import {deserializeOps, splitAttributionLines, subattribution} from '../../static/js/Changeset';
-const { checkValidRev } = require('./checkValidRev');
+import {checkValidRev} from './checkValidRev';
 /*
 * This method seems unused in core and no plugins depend on it
 */
-exports.getPadPlainText = (pad: { getInternalRevisionAText: (arg0: any) => any; atext: any; pool: any; }, revNum: undefined) => {
+export const getPadPlainText = (pad: { getInternalRevisionAText: (arg0: any) => any; atext: any; pool: any; }, revNum: undefined) => {
  const _analyzeLine = exports._analyzeLine;
  const atext = ((revNum !== undefined) ? pad.getInternalRevisionAText(checkValidRev(revNum)) : pad.atext);
  const textLines = atext.text.slice(0, -1).split('\n');
-  const attribLines = Changeset.splitAttributionLines(atext.attribs, atext.text);
+  const attribLines = splitAttributionLines(atext.attribs, atext.text);
  const apool = pad.pool;
  const pieces = [];
@ -52,14 +52,14 @@ type LineModel = {
  [id:string]:string|number|LineModel
 }
-exports._analyzeLine = (text:string, aline: LineModel, apool: AttributePool) => {
+export const _analyzeLine = (text:string, aline: string, apool: AttributePool) => {
  const line: LineModel = {};
  // identify list
  let lineMarker = 0;
  line.listLevel = 0;
  if (aline) {
-    const [op] = Changeset.deserializeOps(aline);
+    const [op] = deserializeOps(aline);
    if (op != null) {
      const attribs = AttributeMap.fromString(op.attribs, apool);
      let listType = attribs.get('list');
@ -79,7 +79,7 @@ exports._analyzeLine = (text:string, aline: LineModel, apool: AttributePool) =>
  }
  if (lineMarker) {
    line.text = text.substring(1);
-    line.aline = Changeset.subattribution(aline, 1);
+    line.aline = subattribution(aline, 1);
  } else {
    line.text = text;
    line.aline = aline;
@ -88,5 +88,5 @@ exports._analyzeLine = (text:string, aline: LineModel, apool: AttributePool) =>
 };
-exports._encodeWhitespace =
+export const _encodeWhitespace =
  (s:string) => s.replace(/[^\x21-\x7E\s\t\n\r]/gu, (c) => `&#${c.codePointAt(0)};`);
--- a/src/node/utils/ExportHtml.ts
+++ b/src/node/utils/ExportHtml.ts
@ -1,6 +1,7 @@
 'use strict';
 import {AText, PadType} from "../types/PadType";
 import {MapArrayType} from "../types/MapType";
 import Pad from "../db/Pad";
 /**
 * Copyright 2009 Google Inc.
@ -18,18 +19,19 @@ import {MapArrayType} from "../types/MapType";
 * limitations under the License.
 */
-const Changeset = require('../../static/js/Changeset');
+import {deserializeOps, splitAttributionLines, subattribution} from '../../static/js/Changeset';
-const attributes = require('../../static/js/attributes');
+import {decodeAttribString} from '../../static/js/attributes';
-const padManager = require('../db/PadManager');
+import {getPad} from '../db/PadManager';
-const _ = require('underscore');
+import _ from 'underscore';
 const Security = require('security');
-const hooks = require('../../static/js/pluginfw/hooks');
+import {aCallAll} from '../../static/js/pluginfw/hooks';
-const eejs = require('../eejs');
+import {requireP} from '../eejs';
-const _analyzeLine = require('./ExportHelper')._analyzeLine;
+import {_analyzeLine, _encodeWhitespace} from './ExportHelper'
-const _encodeWhitespace = require('./ExportHelper')._encodeWhitespace;
+import {StringIterator} from "../../static/js/StringIterator";
 import {StringAssembler} from "../../static/js/StringAssembler";
 const padutils = require('../../static/js/pad_utils').padutils;
-const getPadHTML = async (pad: PadType, revNum: string) => {
+export const getPadHTML = async (pad: Pad, revNum: number) => {
  let atext = pad.atext;
  // fetch revision atext
@ -41,17 +43,17 @@ const getPadHTML = async (pad: PadType, revNum: string) => {
  return await getHTMLFromAtext(pad, atext);
 };
-const getHTMLFromAtext = async (pad:PadType, atext: AText, authorColors?: string[]) => {
+export const getHTMLFromAtext = async (pad:Pad, atext: AText, authorColors?: string[]) => {
  const apool = pad.apool();
  const textLines = atext.text.slice(0, -1).split('\n');
-  const attribLines = Changeset.splitAttributionLines(atext.attribs, atext.text);
+  const attribLines = splitAttributionLines(atext.attribs, atext.text);
  const tags = ['h1', 'h2', 'strong', 'em', 'u', 's'];
  const props = ['heading1', 'heading2', 'bold', 'italic', 'underline', 'strikethrough'];
  await Promise.all([
    // prepare tags stored as ['tag', true] to be exported
-    hooks.aCallAll('exportHtmlAdditionalTags', pad).then((newProps: string[]) => {
+    aCallAll('exportHtmlAdditionalTags', pad).then((newProps: string[]) => {
      newProps.forEach((prop) => {
        tags.push(prop);
        props.push(prop);
@ -59,7 +61,7 @@ const getHTMLFromAtext = async (pad:PadType, atext: AText, authorColors?: string
    }),
    // prepare tags stored as ['tag', 'value'] to be exported. This will generate HTML with tags
    // like <span data-tag="value">
-    hooks.aCallAll('exportHtmlAdditionalTagsWithData', pad).then((newProps: string[]) => {
+    aCallAll('exportHtmlAdditionalTagsWithData', pad).then((newProps: string[]) => {
      newProps.forEach((prop) => {
        tags.push(`span data-${prop[0]}="${prop[1]}"`);
        props.push(prop);
@ -80,6 +82,7 @@ const getHTMLFromAtext = async (pad:PadType, atext: AText, authorColors?: string
    css += '<style>\n';
    for (const a of Object.keys(apool.numToAttrib)) {
      // @ts-ignore
      const attr = apool.numToAttrib[a];
      // skip non author attributes
@ -115,20 +118,21 @@ const getHTMLFromAtext = async (pad:PadType, atext: AText, authorColors?: string
      // see hook exportHtmlAdditionalTagsWithData
      attrib = propName;
    }
    // @ts-ignore
    const propTrueNum = apool.putAttrib(attrib, true);
    if (propTrueNum >= 0) {
      anumMap[propTrueNum] = i;
    }
  });
-  const getLineHTML = (text: string, attribs: string[]) => {
+  const getLineHTML = (text: string, attribs: string) => {
    // Use order of tags (b/i/u) as order of nesting, for simplicity
    // and decent nesting.  For example,
    // <b>Just bold<b> <b><i>Bold and italics</i></b> <i>Just italics</i>
    // becomes
    // <b>Just bold <i>Bold and italics</i></b> <i>Just italics</i>
-    const taker = Changeset.stringIterator(text);
+    const taker = new StringIterator(text);
-    const assem = Changeset.stringAssembler();
+    const assem = new StringAssembler();
    const openTags:string[] = [];
    const getSpanClassFor = (i: string) => {
@ -204,7 +208,7 @@ const getHTMLFromAtext = async (pad:PadType, atext: AText, authorColors?: string
        return;
      }
-      const ops = Changeset.deserializeOps(Changeset.subattribution(attribs, idx, idx + numChars));
+      const ops = deserializeOps(subattribution(attribs, idx, idx + numChars));
      idx += numChars;
      // this iterates over every op string and decides which tags to open or to close
@ -213,7 +217,7 @@ const getHTMLFromAtext = async (pad:PadType, atext: AText, authorColors?: string
        const usedAttribs:string[] = [];
        // mark all attribs as used
-        for (const a of attributes.decodeAttribString(o.attribs)) {
+        for (const a of decodeAttribString(o.attribs)) {
          if (a in anumMap) {
            usedAttribs.push(String(anumMap[a])); // i = 0 => bold, etc.
          }
@ -307,7 +311,7 @@ const getHTMLFromAtext = async (pad:PadType, atext: AText, authorColors?: string
  for (let i = 0; i < textLines.length; i++) {
    let context;
    const line = _analyzeLine(textLines[i], attribLines[i], apool);
-    const lineContent = getLineHTML(line.text, line.aline);
+    const lineContent = getLineHTML(line.text as string, line.aline as string);
    // If we are inside a list
    if (line.listLevel) {
      context = {
@ -326,7 +330,7 @@ const getHTMLFromAtext = async (pad:PadType, atext: AText, authorColors?: string
      if (i < textLines.length) {
        nextLine = _analyzeLine(textLines[i + 1], attribLines[i + 1], apool);
      }
-      await hooks.aCallAll('getLineHTMLForExport', context);
+      await aCallAll('getLineHTMLForExport', context);
      // To create list parent elements
      if ((!prevLine || prevLine.listLevel !== line.listLevel) ||
          (line.listTypeName !== prevLine.listTypeName)) {
@ -335,14 +339,14 @@ const getHTMLFromAtext = async (pad:PadType, atext: AText, authorColors?: string
        if (!exists) {
          let prevLevel = 0;
          if (prevLine && prevLine.listLevel) {
-            prevLevel = prevLine.listLevel;
+            prevLevel = prevLine.listLevel as number;
          }
          if (prevLine && line.listTypeName !== prevLine.listTypeName) {
            prevLevel = 0;
          }
-          for (let diff = prevLevel; diff < line.listLevel; diff++) {
+          for (let diff = prevLevel; diff < (line.listLevel as number); diff++) {
-            openLists.push({level: diff, type: line.listTypeName});
+            openLists.push({level: diff, type: line.listTypeName as string});
            const prevPiece = pieces[pieces.length - 1];
            if (prevPiece.indexOf('<ul') === 0 ||
@ -372,7 +376,7 @@ const getHTMLFromAtext = async (pad:PadType, atext: AText, authorColors?: string
                 // pieces.push("</li>");
              */
-              if ((nextLine.listTypeName === 'number') && (nextLine.text === '')) {
+              if ((nextLine!.listTypeName === 'number') && (nextLine!.text === '')) {
                // is the listTypeName check needed here?  null text might be completely fine!
                // TODO Check against Uls
                // don't do anything because the next item is a nested ol openener so
@ -431,13 +435,13 @@ const getHTMLFromAtext = async (pad:PadType, atext: AText, authorColors?: string
          (line.listTypeName !== nextLine.listTypeName)) {
        let nextLevel = 0;
        if (nextLine && nextLine.listLevel) {
-          nextLevel = nextLine.listLevel;
+          nextLevel = nextLine.listLevel as number;
        }
        if (nextLine && line.listTypeName !== nextLine.listTypeName) {
          nextLevel = 0;
        }
-        for (let diff = nextLevel; diff < line.listLevel; diff++) {
+        for (let diff = nextLevel; diff < (line.listLevel as number); diff++) {
          openLists = openLists.filter((el) => el.level !== diff && el.type !== line.listTypeName);
          if (pieces[pieces.length - 1].indexOf('</ul') === 0 ||
@ -463,7 +467,7 @@ const getHTMLFromAtext = async (pad:PadType, atext: AText, authorColors?: string
        padId: pad.id,
      };
-      await hooks.aCallAll('getLineHTMLForExport', context);
+      await aCallAll('getLineHTMLForExport', context);
      pieces.push(context.lineContent, '<br>');
    }
  }
@ -471,23 +475,24 @@ const getHTMLFromAtext = async (pad:PadType, atext: AText, authorColors?: string
  return pieces.join('');
 };
-exports.getPadHTMLDocument = async (padId: string, revNum: string, readOnlyId: number) => {
+export const getPadHTMLDocument = async (padId: string, revNum: number, readOnlyId: number) => {
-  const pad = await padManager.getPad(padId);
+  const pad = await getPad(padId);
  // Include some Styles into the Head for Export
  let stylesForExportCSS = '';
-  const stylesForExport: string[] = await hooks.aCallAll('stylesForExport', padId);
+  const stylesForExport: string[] = await aCallAll('stylesForExport', padId);
  stylesForExport.forEach((css) => {
    stylesForExportCSS += css;
  });
  let html = await getPadHTML(pad, revNum);
-  for (const hookHtml of await hooks.aCallAll('exportHTMLAdditionalContent', {padId})) {
+  for (const hookHtml of await aCallAll('exportHTMLAdditionalContent', {padId})) {
    html += hookHtml;
  }
-  return eejs.require('ep_etherpad-lite/templates/export_html.html', {
+  return requireP('ep_etherpad-lite/templates/export_html.html', {
    // @ts-ignore
    body: html,
    padId: Security.escapeHTML(readOnlyId || padId),
    extraCSS: stylesForExportCSS,
@ -543,5 +548,3 @@ const _processSpaces = (s: string) => {
  return parts.join('');
 };
 exports.getPadHTML = getPadHTML;
 exports.getHTMLFromAtext = getHTMLFromAtext;
--- a/src/node/utils/ExportTxt.ts
+++ b/src/node/utils/ExportTxt.ts
@ -19,16 +19,19 @@
 * limitations under the License.
 */
-import {AText, PadType} from "../types/PadType";
+import {AText} from "../types/PadType";
 import {MapType} from "../types/MapType";
-const Changeset = require('../../static/js/Changeset');
+import {deserializeOps, splitAttributionLines, subattribution} from '../../static/js/Changeset';
-const attributes = require('../../static/js/attributes');
+import {decodeAttribString} from '../../static/js/attributes';
-const padManager = require('../db/PadManager');
+import {getPad} from '../db/PadManager';
-const _analyzeLine = require('./ExportHelper')._analyzeLine;
+import {StringIterator} from "../../static/js/StringIterator";
 import {StringAssembler} from "../../static/js/StringAssembler";
 import Pad from "../db/Pad";
 import {_analyzeLine} from "./ExportHelper";
 // This is slightly different than the HTML method as it passes the output to getTXTFromAText
-const getPadTXT = async (pad: PadType, revNum: string) => {
+const getPadTXT = async (pad: Pad, revNum: number) => {
  let atext = pad.atext;
  if (revNum !== undefined) {
@ -40,18 +43,19 @@ const getPadTXT = async (pad: PadType, revNum: string) => {
  return getTXTFromAtext(pad, atext);
 };
-// This is different than the functionality provided in ExportHtml as it provides formatting
+// This is different from the functionality provided in ExportHtml as it provides formatting
 // functionality that is designed specifically for TXT exports
-const getTXTFromAtext = (pad: PadType, atext: AText, authorColors?:string) => {
+export const getTXTFromAtext = (pad: Pad, atext: AText, authorColors?:string) => {
  const apool = pad.apool();
  const textLines = atext.text.slice(0, -1).split('\n');
-  const attribLines = Changeset.splitAttributionLines(atext.attribs, atext.text);
+  const attribLines = splitAttributionLines(atext.attribs, atext.text);
  const props = ['heading1', 'heading2', 'bold', 'italic', 'underline', 'strikethrough'];
  const anumMap: MapType = {};
  const css = '';
  props.forEach((propName, i) => {
    // @ts-ignore
    const propTrueNum = apool.putAttrib([propName, true], true);
    if (propTrueNum >= 0) {
      anumMap[propTrueNum] = i;
@ -69,8 +73,8 @@ const getTXTFromAtext = (pad: PadType, atext: AText, authorColors?:string) => {
    // <b>Just bold<b> <b><i>Bold and italics</i></b> <i>Just italics</i>
    // becomes
    // <b>Just bold <i>Bold and italics</i></b> <i>Just italics</i>
-    const taker = Changeset.stringIterator(text);
+    const taker = new StringIterator(text);
-    const assem = Changeset.stringAssembler();
+    const assem = new StringAssembler();
    let idx = 0;
@ -79,13 +83,13 @@ const getTXTFromAtext = (pad: PadType, atext: AText, authorColors?:string) => {
        return;
      }
-      const ops = Changeset.deserializeOps(Changeset.subattribution(attribs, idx, idx + numChars));
+      const ops = deserializeOps(subattribution(attribs, idx, idx + numChars));
      idx += numChars;
      for (const o of ops) {
        let propChanged = false;
-        for (const a of attributes.decodeAttribString(o.attribs)) {
+        for (const a of decodeAttribString(o.attribs)) {
          if (a in anumMap) {
            const i = anumMap[a] as number; // i = 0 => bold, etc.
@ -197,7 +201,7 @@ const getTXTFromAtext = (pad: PadType, atext: AText, authorColors?:string) => {
  for (let i = 0; i < textLines.length; i++) {
    const line = _analyzeLine(textLines[i], attribLines[i], apool);
-    let lineContent = getLineTXT(line.text, line.aline);
+    let lineContent = getLineTXT(line.text as string, line.aline);
    if (line.listTypeName === 'bullet') {
      lineContent = `* ${lineContent}`; // add a bullet
@ -210,11 +214,11 @@ const getTXTFromAtext = (pad: PadType, atext: AText, authorColors?:string) => {
      }
    }
-    if (line.listLevel > 0) {
+    if ((line.listLevel as number) > 0) {
-      for (let j = line.listLevel - 1; j >= 0; j--) {
+      for (let j = (line.listLevel as number) - 1; j >= 0; j--) {
        pieces.push('\t'); // tab indent list numbers..
-        if (!listNumbers[line.listLevel]) {
+        if (!listNumbers[(line.listLevel as number)]) {
-          listNumbers[line.listLevel] = 0;
+          listNumbers[(line.listLevel as number)] = 0;
        }
      }
@ -232,23 +236,23 @@ const getTXTFromAtext = (pad: PadType, atext: AText, authorColors?:string) => {
        * To handle going back to 2.1 when prevListLevel is lower number
        * than current line.listLevel then reset the object value
        */
-        if (line.listLevel < prevListLevel) {
+        if ((line.listLevel as number) < prevListLevel!) {
-          delete listNumbers[prevListLevel];
+          delete listNumbers[(prevListLevel as number)];
        }
        // @ts-ignore
        listNumbers[line.listLevel]++;
-        if (line.listLevel > 1) {
+        if ((line.listLevel as number) > 1) {
          let x = 1;
-          while (x <= line.listLevel - 1) {
+          while (x <= (line.listLevel as number) - 1) {
            // if it's undefined to avoid undefined.undefined.1 for 0.0.1
            if (!listNumbers[x]) listNumbers[x] = 0;
            pieces.push(`${listNumbers[x]}.`);
            x++;
          }
        }
-        pieces.push(`${listNumbers[line.listLevel]}. `);
+        pieces.push(`${listNumbers[(line.listLevel as number)]}. `);
-        prevListLevel = line.listLevel;
+        prevListLevel = line.listLevel as number;
      }
      pieces.push(lineContent, '\n');
@ -260,9 +264,8 @@ const getTXTFromAtext = (pad: PadType, atext: AText, authorColors?:string) => {
  return pieces.join('');
 };
 exports.getTXTFromAtext = getTXTFromAtext;
-exports.getPadTXTDocument = async (padId:string, revNum:string) => {
+export const getPadTXTDocument = async (padId:string, revNum:number) => {
-  const pad = await padManager.getPad(padId);
+  const pad = await getPad(padId);
  return getPadTXT(pad, revNum);
 };
--- a/src/node/utils/ImportEtherpad.ts
+++ b/src/node/utils/ImportEtherpad.ts
@ -1,7 +1,5 @@
 'use strict';
 import {APool} from "../types/PadType";
 /**
 * 2014 John McLear (Etherpad Foundation / McLear Ltd)
 *
@ -19,29 +17,28 @@ import {APool} from "../types/PadType";
 */
 import AttributePool from '../../static/js/AttributePool';
-const {Pad} = require('../db/Pad');
+import Pad from '../db/Pad';
-const Stream = require('./Stream');
+import Stream from './Stream';
-const authorManager = require('../db/AuthorManager');
+import {addPad, doesAuthorExist} from '../db/AuthorManager';
-const db = require('../db/DB');
+import {aCallAll, callAll} from '../../static/js/pluginfw/hooks';
 const hooks = require('../../static/js/pluginfw/hooks');
 import log4js from 'log4js';
 const supportedElems = require('../../static/js/contentcollector').supportedElems;
 import ueberdb from 'ueberdb2';
 const logger = log4js.getLogger('ImportEtherpad');
-exports.setPadRaw = async (padId: string, r: string, authorId = '') => {
+export const setPadRaw = async (padId: string, r: string, authorId = '') => {
  const records = JSON.parse(r);
  // get supported block Elements from plugins, we will use this later.
-  hooks.callAll('ccRegisterBlockElements').forEach((element:any) => {
+  callAll('ccRegisterBlockElements').forEach((element:any) => {
    supportedElems.add(element);
  });
  // DB key prefixes for pad records. Each key is expected to have the form `${prefix}:${padId}` or
  // `${prefix}:${padId}:${otherstuff}`.
  const padKeyPrefixes = [
-    ...await hooks.aCallAll('exportEtherpadAdditionalContent'),
+    ...await aCallAll('exportEtherpadAdditionalContent'),
    'pad',
  ];
@ -55,7 +52,7 @@ exports.setPadRaw = async (padId: string, r: string, authorId = '') => {
  // there is a problem with the data.
  const data = new Map();
-  const existingAuthors = new Set();
+  const existingAuthors = new Set<string>();
  const padDb = new ueberdb.Database('memory', {data});
  await padDb.init();
  try {
@ -74,7 +71,7 @@ exports.setPadRaw = async (padId: string, r: string, authorId = '') => {
          throw new TypeError('globalAuthor padIDs subkey is not a string');
        }
        checkOriginalPadId(value.padIDs);
-        if (await authorManager.doesAuthorExist(id)) {
+        if (await doesAuthorExist(id)) {
          existingAuthors.add(id);
          return;
        }
@ -106,9 +103,9 @@ exports.setPadRaw = async (padId: string, r: string, authorId = '') => {
    const readOps = new Stream(Object.entries(records)).map(([k, v]) => processRecord(k, v));
    for (const op of readOps.batch(100).buffer(99)) await op;
-    const pad = new Pad(padId, padDb);
+    const pad = new Pad(padId);
    await pad.init(null, authorId);
-    await hooks.aCallAll('importEtherpad', {
+    await aCallAll('importEtherpad', {
      pad,
      // Shallow freeze meant to prevent accidental bugs. It would be better to deep freeze, but
      // it's not worth the added complexity.
@ -121,8 +118,8 @@ exports.setPadRaw = async (padId: string, r: string, authorId = '') => {
  }
  const writeOps = (function* () {
-    for (const [k, v] of data) yield db.set(k, v);
+    for (const [k, v] of data) yield padDb.set(k, v);
-    for (const a of existingAuthors) yield authorManager.addPad(a, padId);
+    for (const a of existingAuthors) yield addPad(a, padId);
  })();
  for (const op of new Stream(writeOps).batch(100).buffer(99)) await op;
 };
--- a/src/node/utils/ImportHtml.ts
+++ b/src/node/utils/ImportHtml.ts
@ -16,15 +16,16 @@
 */
 import log4js from 'log4js';
-const Changeset = require('../../static/js/Changeset');
+import {deserializeOps} from '../../static/js/Changeset';
-const contentcollector = require('../../static/js/contentcollector');
+import ContentCollector from '../../static/js/contentcollector';
 import jsdom from 'jsdom';
-import {PadType} from "../types/PadType";
+import Pad from "../db/Pad";
 import {Builder} from "../../static/js/Builder";
 const apiLogger = log4js.getLogger('ImportHtml');
 let processor:any;
-exports.setPadHTML = async (pad: PadType, html:string, authorId = '') => {
+export const setPadHTML = async (pad: Pad, html:string, authorId = '') => {
  if (processor == null) {
    const [{rehype}, {default: minifyWhitespace}] =
        await Promise.all([import('rehype'), import('rehype-minify-whitespace')]);
@ -43,7 +44,7 @@ exports.setPadHTML = async (pad: PadType, html:string, authorId = '') => {
  // Convert a dom tree into a list of lines and attribute liens
  // using the content collector object
-  const cc = contentcollector.makeContentCollector(true, null, pad.pool);
+  const cc = new ContentCollector(true, null, pad.pool);
  try {
    // we use a try here because if the HTML is bad it will blow up
    cc.collectContent(document.body);
@ -69,13 +70,13 @@ exports.setPadHTML = async (pad: PadType, html:string, authorId = '') => {
  const newAttribs = `${result.lineAttribs.join('|1+1')}|1+1`;
  // create a new changeset with a helper builder object
-  const builder = Changeset.builder(1);
+  const builder = new Builder(1);
  // assemble each line into the builder
  let textIndex = 0;
  const newTextStart = 0;
  const newTextEnd = newText.length;
-  for (const op of Changeset.deserializeOps(newAttribs)) {
+  for (const op of deserializeOps(newAttribs)) {
    const nextIndex = textIndex + op.chars;
    if (!(nextIndex <= newTextStart || textIndex >= newTextEnd)) {
      const start = Math.max(newTextStart, textIndex);
--- a/src/node/utils/LibreOffice.ts
+++ b/src/node/utils/LibreOffice.ts
@ -17,12 +17,12 @@
 * limitations under the License.
 */
-const async = require('async');
+import async from 'async';
-const fs = require('fs').promises;
+import {promises as fs} from 'fs'
-const log4js = require('log4js');
+import log4js from 'log4js';
-const os = require('os');
+import os from 'os';
-const path = require('path');
+import path from 'path';
-const runCmd = require('./run_cmd');
+import runCmd from './run_cmd';
 const settings = require('./Settings');
 const logger = log4js.getLogger('LibreOffice');
@ -54,25 +54,25 @@ const doConvertTask = async (task:{
      // @ts-ignore
      (line) => logger.error(`[${p.child.pid}] stderr: ${line}`),
  ]});
-  logger.info(`[${p.child.pid}] Converting ${task.srcFile} to ${task.type} in ${tmpDir}`);
+  logger.info(`[${p.child!.pid}] Converting ${task.srcFile} to ${task.type} in ${tmpDir}`);
  // Soffice/libreoffice is buggy and often hangs.
  // To remedy this we kill the spawned process after a while.
  // TODO: Use the timeout option once support for Node.js < v15.13.0 is dropped.
  const hangTimeout = setTimeout(() => {
-    logger.error(`[${p.child.pid}] Conversion timed out; killing LibreOffice...`);
+    logger.error(`[${p.child!.pid}] Conversion timed out; killing LibreOffice...`);
-    p.child.kill();
+    p.child!.kill();
  }, 120000);
  try {
    await p;
  } catch (err:any) {
-    logger.error(`[${p.child.pid}] Conversion failed: ${err.stack || err}`);
+    logger.error(`[${p.child!.pid}] Conversion failed: ${err.stack || err}`);
    throw err;
  } finally {
    clearTimeout(hangTimeout);
  }
-  logger.info(`[${p.child.pid}] Conversion done.`);
+  logger.info(`[${p.child!.pid}] Conversion done.`);
  const filename = path.basename(task.srcFile);
-  const sourceFile = `${filename.substr(0, filename.lastIndexOf('.'))}.${task.fileExtension}`;
+  const sourceFile = `${filename.substring(0, filename.lastIndexOf('.'))}.${task.fileExtension}`;
  const sourcePath = path.join(tmpDir, sourceFile);
  logger.debug(`Renaming ${sourcePath} to ${task.destFile}`);
  await fs.rename(sourcePath, task.destFile);
@ -89,7 +89,7 @@ const queue = async.queue(doConvertTask, 1);
 * @param  {String}     type        The type to convert into
 * @param  {Function}   callback    Standard callback function
 */
-exports.convertFile = async (srcFile: string, destFile: string, type:string) => {
+export const convertFile = async (srcFile: string, destFile: string, type:string) => {
  // Used for the moving of the file, not the conversion
  const fileExtension = type;
--- a/src/node/utils/NodeVersion.ts
+++ b/src/node/utils/NodeVersion.ts
@ -19,14 +19,14 @@
 * limitations under the License.
 */
-const semver = require('semver');
+import semver from 'semver';
 /**
 * Quits if Etherpad is not running on a given minimum Node version
 *
 * @param  {String}     minNodeVersion   Minimum required Node version
 */
-exports.enforceMinNodeVersion = (minNodeVersion: string) => {
+export const enforceMinNodeVersion = (minNodeVersion: string) => {
  const currentNodeVersion = process.version;
  // we cannot use template literals, since we still do not know if we are
@ -49,7 +49,7 @@ exports.enforceMinNodeVersion = (minNodeVersion: string) => {
 * @param {Function} epRemovalVersion Etherpad version that will remove support for deprecated
 *     Node releases
 */
-exports.checkDeprecationStatus = (lowestNonDeprecatedNodeVersion: string, epRemovalVersion:Function) => {
+export const checkDeprecationStatus = (lowestNonDeprecatedNodeVersion: string, epRemovalVersion:string) => {
  const currentNodeVersion = process.version;
  if (semver.lt(currentNodeVersion, lowestNonDeprecatedNodeVersion)) {
--- a/src/node/utils/Settings.ts
+++ b/src/node/utils/Settings.ts
--- a/src/node/utils/Stream.ts
+++ b/src/node/utils/Stream.ts
@ -5,12 +5,12 @@
 * objects lack.
 */
 class Stream {
-  private _iter
+  private readonly _iter
  private _next: any
  /**
   * @returns {Stream} A Stream that yields values in the half-open range [start, end).
   */
-  static range(start: number, end: number) {
+  static range(start: number, end: number): Stream {
    return new Stream((function* () { for (let i = start; i < end; ++i) yield i; })());
  }
@ -127,7 +127,7 @@ class Stream {
   * @param {(v: any) => any} fn - Value transformation function.
   * @returns {Stream} A new Stream that yields this Stream's values, transformed by `fn`.
   */
-  map(fn:Function) { return new Stream((function* () { // @ts-ignore
+  map(fn:Function): Stream { return new Stream((function* () { // @ts-ignore
    for (const v of this) yield fn(v); }).call(this)); }
  /**
@ -136,4 +136,4 @@ class Stream {
  [Symbol.iterator]() { return this._iter; }
 }
-module.exports = Stream;
+export default Stream;
--- a/src/node/utils/UpdateCheck.ts
+++ b/src/node/utils/UpdateCheck.ts
@ -1,9 +1,11 @@
 'use strict';
-const semver = require('semver');
+import semver from 'semver';
-const settings = require('./Settings');
+import {getEpVersion} from './Settings';
 import axios from 'axios';
 const headers = {
-  'User-Agent': 'Etherpad/' + settings.getEpVersion(),
+  'User-Agent': 'Etherpad/' + getEpVersion(),
 }
 type Infos = {
@ -37,15 +39,15 @@ const loadEtherpadInformations = () => {
 }
-exports.getLatestVersion = () => {
+export const getLatestVersion = () => {
-  exports.needsUpdate().catch();
+  needsUpdate().catch();
  return infos?.latestVersion;
 };
-exports.needsUpdate = async (cb?: Function) => {
+export const needsUpdate = async (cb?: Function) => {
  try {
    const info = await loadEtherpadInformations()
-    if (semver.gt(info!.latestVersion, settings.getEpVersion())) {
+    if (semver.gt(info!.latestVersion, getEpVersion())) {
      if (cb) return cb(true);
    }
  } catch (err) {
@ -54,8 +56,8 @@ exports.needsUpdate = async (cb?: Function) => {
  }
 };
-exports.check = () => {
+export const check = () => {
-  exports.needsUpdate((needsUpdate: boolean) => {
+  needsUpdate((needsUpdate: boolean) => {
    if (needsUpdate) {
      console.warn(`Update available: Download the actual version ${infos.latestVersion}`);
    }
--- a/src/node/utils/caching_middleware.ts
+++ b/src/node/utils/caching_middleware.ts
@ -22,7 +22,7 @@ const fsp = fs.promises;
 import path from 'path';
 import zlib from 'zlib';
 const settings = require('./Settings');
-const existsSync = require('./path_exists');
+import existsSync from './path_exists';
 import util from 'util';
 /*
--- a/src/node/utils/checkValidRev.ts
+++ b/src/node/utils/checkValidRev.ts
@ -1,10 +1,10 @@
 'use strict';
-const CustomError = require('../utils/customError');
+import CustomError from '../utils/customError';
 // checks if a rev is a legal number
 // pre-condition is that `rev` is not undefined
-const checkValidRev = (rev: number|string) => {
+export const checkValidRev = (rev: number|string) => {
  if (typeof rev !== 'number') {
    rev = parseInt(rev, 10);
  }
@ -28,7 +28,4 @@ const checkValidRev = (rev: number|string) => {
 };
 // checks if a number is an int
-const isInt = (value:number) => (parseFloat(String(value)) === parseInt(String(value), 10)) && !isNaN(value);
+export const isInt = (value:number) => (parseFloat(String(value)) === parseInt(String(value), 10)) && !isNaN(value);
 exports.isInt = isInt;
 exports.checkValidRev = checkValidRev;
--- a/src/node/utils/customError.ts
+++ b/src/node/utils/customError.ts
@ -21,4 +21,4 @@ class CustomError extends Error {
  }
 }
-module.exports = CustomError;
+export default CustomError
--- a/src/node/utils/padDiff.ts
+++ b/src/node/utils/padDiff.ts
@ -4,19 +4,25 @@ import {PadAuthor, PadType} from "../types/PadType";
 import {MapArrayType} from "../types/MapType";
 import AttributeMap from '../../static/js/AttributeMap';
-const Changeset = require('../../static/js/Changeset');
+import {applyToAText, checkRep, compose, deserializeOps, pack, splitAttributionLines, splitTextLines, unpack} from '../../static/js/Changeset';
-const attributes = require('../../static/js/attributes');
+import {attribsFromString} from '../../static/js/attributes';
-const exportHtml = require('./ExportHtml');
+import {getHTMLFromAtext} from './ExportHtml';
 import {Builder} from "../../static/js/Builder";
 import Pad from "../db/Pad";
 import {OpAssembler} from "../../static/js/OpAssembler";
 import {numToString} from "../../static/js/ChangesetUtils";
 import Op from "../../static/js/Op";
 import {StringAssembler} from "../../static/js/StringAssembler";
 class PadDiff {
-  private readonly _pad: PadType;
+  private readonly _pad: Pad;
    private readonly _fromRev: string;
    private readonly _toRev: string;
    private _html: any;
    public _authors: any[];
    private self: PadDiff | undefined
-  constructor(pad: PadType, fromRev:string, toRev:string) {
+  constructor(pad: Pad, fromRev:number, toRev:number) {
    // check parameters
    if (!pad || !pad.id || !pad.atext || !pad.pool) {
      throw new Error('Invalid pad');
@ -33,7 +39,7 @@ class PadDiff {
  }
  _isClearAuthorship(changeset: any){
    // unpack
-    const unpacked = Changeset.unpack(changeset);
+    const unpacked = unpack(changeset);
    // check if there is nothing in the charBank
    if (unpacked.charBank !== '') {
@ -45,7 +51,7 @@ class PadDiff {
      return false;
    }
-    const [clearOperator, anotherOp] = Changeset.deserializeOps(unpacked.ops);
+    const [clearOperator, anotherOp] = deserializeOps(unpacked.ops);
    // check if there is only one operator
    if (anotherOp != null) return false;
@ -62,7 +68,7 @@ class PadDiff {
    }
    const [appliedAttribute, anotherAttribute] =
-        attributes.attribsFromString(clearOperator.attribs, this._pad.pool);
+        attribsFromString(clearOperator.attribs, this._pad.pool);
    // Check that the operation has exactly one attribute.
    if (appliedAttribute == null || anotherAttribute != null) return false;
@ -78,7 +84,7 @@ class PadDiff {
    const atext = await this._pad.getInternalRevisionAText(rev);
    // build clearAuthorship changeset
-    const builder = Changeset.builder(atext.text.length);
+    const builder = new Builder(atext.text.length);
    builder.keepText(atext.text, [['author', '']], this._pad.pool);
    const changeset = builder.toString();
@ -93,7 +99,7 @@ class PadDiff {
    const changeset = await this._createClearAuthorship(rev);
    // apply the clearAuthorship changeset
-    const newAText = Changeset.applyToAText(changeset, atext, this._pad.pool);
+    const newAText = applyToAText(changeset, atext, this._pad.pool);
    return newAText;
  }
@ -157,7 +163,7 @@ class PadDiff {
        if (superChangeset == null) {
          superChangeset = changeset;
        } else {
-          superChangeset = Changeset.compose(superChangeset, changeset, this._pad.pool);
+          superChangeset = compose(superChangeset, changeset, this._pad.pool);
        }
      }
@ -171,10 +177,10 @@ class PadDiff {
      const deletionChangeset = this._createDeletionChangeset(superChangeset, atext, this._pad.pool);
      // apply the superChangeset, which includes all addings
-      atext = Changeset.applyToAText(superChangeset, atext, this._pad.pool);
+      atext = applyToAText(superChangeset, atext, this._pad.pool);
      // apply the deletionChangeset, which adds a deletions
-      atext = Changeset.applyToAText(deletionChangeset, atext, this._pad.pool);
+      atext = applyToAText(deletionChangeset, atext, this._pad.pool);
    }
    return atext;
@ -192,7 +198,8 @@ class PadDiff {
    const authorColors = await this._pad.getAllAuthorColors();
    // convert the atext to html
-    this._html = await exportHtml.getHTMLFromAtext(this._pad, atext, authorColors);
+    // @ts-ignore
    this._html = await getHTMLFromAtext(this._pad, atext, authorColors);
    return this._html;
  }
@ -209,22 +216,22 @@ class PadDiff {
  _extendChangesetWithAuthor(changeset: any, author: any, apool: any){
    // unpack
-    const unpacked = Changeset.unpack(changeset);
+    const unpacked = unpack(changeset);
-    const assem = Changeset.opAssembler();
+    const assem = new OpAssembler();
    // create deleted attribs
    const authorAttrib = apool.putAttrib(['author', author || '']);
    const deletedAttrib = apool.putAttrib(['removed', true]);
-    const attribs = `*${Changeset.numToString(authorAttrib)}*${Changeset.numToString(deletedAttrib)}`;
+    const attribs = `*${numToString(authorAttrib)}*${numToString(deletedAttrib)}`;
-    for (const operator of Changeset.deserializeOps(unpacked.ops)) {
+    for (const operator of deserializeOps(unpacked.ops)) {
      if (operator.opcode === '-') {
        // this is a delete operator, extend it with the author
        operator.attribs = attribs;
      } else if (operator.opcode === '=' && operator.attribs) {
        // this is operator changes only attributes, let's mark which author did that
-        operator.attribs += `*${Changeset.numToString(authorAttrib)}`;
+        operator.attribs += `*${numToString(authorAttrib)}`;
      }
      // append the new operator to our assembler
@ -232,18 +239,19 @@ class PadDiff {
    }
    // return the modified changeset
-    return Changeset.pack(unpacked.oldLen, unpacked.newLen, assem.toString(), unpacked.charBank);
+    return pack(unpacked.oldLen, unpacked.newLen, assem.toString(), unpacked.charBank);
  }
  _createDeletionChangeset(cs: any, startAText: any, apool: any){
-    const lines = Changeset.splitTextLines(startAText.text);
+    const lines = splitTextLines(startAText.text)!;
-    const alines = Changeset.splitAttributionLines(startAText.attribs, startAText.text);
+    const alines = splitAttributionLines(startAText.attribs, startAText.text);
    // lines and alines are what the exports is meant to apply to.
    // They may be arrays or objects with .get(i) and .length methods.
    // They include final newlines on lines.
    const linesGet = (idx: number) => {
-      if (lines.get) {
+      if ("get" in lines) {
        // @ts-ignore
        return lines.get(idx);
      } else {
        return lines[idx];
@ -251,7 +259,8 @@ class PadDiff {
    };
    const aLinesGet = (idx: number) => {
-      if (alines.get) {
+      if ("get" in alines) {
        // @ts-ignore
        return alines.get(idx);
      } else {
        return alines[idx];
@ -263,14 +272,14 @@ class PadDiff {
    let curLineOps: { next: () => any; } | null = null;
    let curLineOpsNext: { done: any; value: any; } | null = null;
    let curLineOpsLine: number;
-    let curLineNextOp = new Changeset.Op('+');
+    let curLineNextOp = new Op('+');
-    const unpacked = Changeset.unpack(cs);
+    const unpacked = unpack(cs);
-    const builder = Changeset.builder(unpacked.newLen);
+    const builder = new Builder(unpacked.newLen);
    const consumeAttribRuns = (numChars: number, func: Function /* (len, attribs, endsLine)*/) => {
      if (!curLineOps || curLineOpsLine !== curLine) {
-        curLineOps = Changeset.deserializeOps(aLinesGet(curLine));
+        curLineOps = deserializeOps(aLinesGet(curLine));
        curLineOpsNext = curLineOps!.next();
        curLineOpsLine = curLine;
        let indexIntoLine = 0;
@ -291,13 +300,13 @@ class PadDiff {
          curChar = 0;
          curLineOpsLine = curLine;
          curLineNextOp.chars = 0;
-          curLineOps = Changeset.deserializeOps(aLinesGet(curLine));
+          curLineOps = deserializeOps(aLinesGet(curLine));
          curLineOpsNext = curLineOps!.next();
        }
        if (!curLineNextOp.chars) {
          if (curLineOpsNext!.done) {
-            curLineNextOp = new Changeset.Op();
+            curLineNextOp = new Op();
          } else {
            curLineNextOp = curLineOpsNext!.value;
            curLineOpsNext = curLineOps!.next();
@ -332,7 +341,7 @@ class PadDiff {
    const nextText = (numChars: number) => {
      let len = 0;
-      const assem = Changeset.stringAssembler();
+      const assem = new StringAssembler();
      const firstString = linesGet(curLine).substring(curChar);
      len += firstString.length;
      assem.append(firstString);
@ -360,7 +369,7 @@ class PadDiff {
      };
    };
-    for (const csOp of Changeset.deserializeOps(unpacked.ops)) {
+    for (const csOp of deserializeOps(unpacked.ops)) {
      if (csOp.opcode === '=') {
        const textBank = nextText(csOp.chars);
@ -442,7 +451,7 @@ class PadDiff {
      }
    }
-    return Changeset.checkRep(builder.toString());
+    return checkRep(builder.toString());
  }
 }
@ -450,9 +459,9 @@ class PadDiff {
 // this method is 80% like Changeset.inverse. I just changed so instead of reverting,
 // it adds deletions and attribute changes to the atext.
 // @ts-ignore
 PadDiff.prototype._createDeletionChangeset = function (cs, startAText, apool) {
 };
-// export the constructor
+export default PadDiff
 module.exports = PadDiff;
--- a/src/node/utils/path_exists.ts
+++ b/src/node/utils/path_exists.ts
@ -1,5 +1,5 @@
 'use strict';
-const fs = require('fs');
+import fs from 'fs';
 const check = (path:string) => {
  const existsSync = fs.statSync || fs.existsSync;
@ -13,4 +13,4 @@ const check = (path:string) => {
  return result;
 };
-module.exports = check;
+export default check
--- a/src/node/utils/promises.ts
+++ b/src/node/utils/promises.ts
@ -7,7 +7,7 @@
 // `predicate`. Resolves to `undefined` if none of the Promises satisfy `predicate`, or if
 // `promises` is empty. If `predicate` is nullish, the truthiness of the resolved value is used as
 // the predicate.
-exports.firstSatisfies = <T>(promises: Promise<T>[], predicate: null|Function) => {
+export const firstSatisfies = <T>(promises: Promise<T>[], predicate: null|Function) => {
  if (predicate == null) {
    predicate = (x: any) => x;
  }
@ -44,7 +44,7 @@ exports.firstSatisfies = <T>(promises: Promise<T>[], predicate: null|Function) =
 // `total` is greater than `concurrency`, then `concurrency` Promises will be created right away,
 // and each remaining Promise will be created once one of the earlier Promises resolves.) This async
 // function resolves once all `total` Promises have resolved.
-exports.timesLimit = async (total: number, concurrency: number, promiseCreator: Function) => {
+export const timesLimit = async (total: number, concurrency: number, promiseCreator: Function) => {
  if (total > 0 && concurrency <= 0) throw new RangeError('concurrency must be positive');
  let next = 0;
  const addAnother = () => promiseCreator(next++).finally(() => {
@ -61,7 +61,9 @@ exports.timesLimit = async (total: number, concurrency: number, promiseCreator:
 * An ordinary Promise except the `resolve` and `reject` executor functions are exposed as
 * properties.
 */
-class Gate<T> extends Promise<T> {
+export class Gate<T> extends Promise<T> {
  resolve?:Function
  private reject?:Function
  // Coax `.then()` into returning an ordinary Promise, not a Gate. See
  // https://stackoverflow.com/a/65669070 for the rationale.
  static get [Symbol.species]() { return Promise; }
@ -75,4 +77,3 @@ class Gate<T> extends Promise<T> {
    Object.assign(this, props);
  }
 }
 exports.Gate = Gate;
--- a/src/node/utils/randomstring.ts
+++ b/src/node/utils/randomstring.ts
@ -3,8 +3,6 @@
 * Generates a random String with the given length. Is needed to generate the
 * Author, Group, readonly, session Ids
 */
-const cryptoMod = require('crypto');
+import {randomBytes} from 'crypto';
-const randomString = (len: number) => cryptoMod.randomBytes(len).toString('hex');
+export const randomString = (len: number) => randomBytes(len).toString('hex');
 module.exports = randomString;
--- a/src/node/utils/run_cmd.ts
+++ b/src/node/utils/run_cmd.ts
@ -1,13 +1,13 @@
 'use strict';
 import {ErrorExtended, RunCMDOptions, RunCMDPromise} from "../types/RunCMDOptions";
-import {ChildProcess} from "node:child_process";
+import {ChildProcess, SpawnOptions} from "node:child_process";
 import {PromiseWithStd} from "../types/PromiseWithStd";
 import {Readable} from "node:stream";
-const spawn = require('cross-spawn');
+import spawn from 'cross-spawn';
-const log4js = require('log4js');
+import log4js from 'log4js';
-const path = require('path');
+import path from 'path';
 const settings = require('./Settings');
 const logger = log4js.getLogger('runCmd');
@ -74,7 +74,7 @@ const logLines = (readable: undefined | Readable | null, logLineFn: (arg0: (stri
 *   - `stderr`: Similar to `stdout` but for stderr.
 *   - `child`: The ChildProcess object.
 */
-module.exports = exports = (args: string[], opts:RunCMDOptions = {}) => {
+export default (args: string[], opts:RunCMDOptions = {}) => {
  logger.debug(`Executing command: ${args.join(' ')}`);
  opts = {cwd: settings.root, ...opts};
@ -123,7 +123,7 @@ module.exports = exports = (args: string[], opts:RunCMDOptions = {}) => {
  // process's `exit` handler so that we get a useful stack trace.
  const procFailedErr: Error & ErrorExtended = new Error();
-  const proc: ChildProcess = spawn(args[0], args.slice(1), opts);
+  const proc: ChildProcess = spawn(args[0], args.slice(1), opts as SpawnOptions);
  const streams:[undefined, Readable|null, Readable|null] = [undefined, proc.stdout, proc.stderr];
  let px: { reject: any; resolve: any; };
--- a/src/node/utils/sanitizePathname.ts
+++ b/src/node/utils/sanitizePathname.ts
@ -1,10 +1,10 @@
 'use strict';
-const path = require('path');
+import path from 'path';
 // Normalizes p and ensures that it is a relative path that does not reach outside. See
 // https://nvd.nist.gov/vuln/detail/CVE-2015-3297 for additional context.
-module.exports = (p: string, pathApi = path) => {
+export default (p: string, pathApi = path) => {
  // The documentation for path.normalize() says that it resolves '..' and '.' segments. The word
  // "resolve" implies that it examines the filesystem to resolve symbolic links, so 'a/../b' might
  // not be the same thing as 'b'. Most path normalization functions from other libraries (e.g.,
--- a/src/node/utils/toolbar.ts
+++ b/src/node/utils/toolbar.ts
@ -50,7 +50,7 @@ type ButtonGroupType = {
 }
 class ButtonGroup {
-    private buttons: Button[]
+    private readonly buttons: Button[]
    constructor() {
        this.buttons = []
@ -99,7 +99,8 @@ class Button {
    }
    public static load(btnName: string) {
-        const button = module.exports.availableButtons[btnName];
+        // @ts-ignore
      const button = toolbar.availableButtons[btnName];
        try {
            if (button.constructor === Button || button.constructor === SelectButton) {
                return button;
@ -189,7 +190,7 @@ class Separator {
    }
 }
-module.exports = {
+const toolbar =  {
    availableButtons: {
        bold: defaultButtonAttributes('bold'),
        italic: defaultButtonAttributes('italic'),
@ -261,7 +262,8 @@ module.exports = {
    },
    registerButton(buttonName: string, buttonInfo: any) {
-        this.availableButtons[buttonName] = buttonInfo;
+        // @ts-ignore
      this.availableButtons[buttonName] = buttonInfo;
    },
    button: (attributes: AttributeObj) => new Button(attributes),
@ -304,3 +306,5 @@ module.exports = {
        return groups.join(this.separator());
    },
 };
 export default toolbar
--- a/src/package.json
+++ b/src/package.json
@ -31,6 +31,7 @@
  ],
  "dependencies": {
    "@etherpad/express-session": "^1.18.2",
    "@types/cookie-parser": "^1.4.7",
    "async": "^3.2.5",
    "axios": "^1.7.2",
    "cookie-parser": "^1.4.6",
@ -83,19 +84,24 @@
  "devDependencies": {
    "@playwright/test": "^1.45.2",
    "@types/async": "^3.2.24",
    "@types/cross-spawn": "^6.0.6",
    "@types/ejs": "^3.1.5",
    "@types/express": "^4.17.21",
    "@types/formidable": "^3.4.5",
    "@types/http-errors": "^2.0.4",
    "@types/jquery": "^3.5.30",
    "@types/js-cookie": "^3.0.6",
    "@types/jsdom": "^21.1.7",
    "@types/jsonminify": "^0.4.3",
    "@types/jsonwebtoken": "^9.0.6",
    "@types/mocha": "^10.0.7",
    "@types/node": "^20.14.11",
    "@types/oidc-provider": "^8.5.1",
    "@types/resolve": "^1.20.6",
    "@types/semver": "^7.5.8",
    "@types/sinon": "^17.0.3",
    "@types/supertest": "^6.0.2",
    "@types/tinycon": "^0.6.5",
    "@types/underscore": "^1.11.15",
    "@types/unorm": "^1.3.31",
    "chokidar": "^3.6.0",
@ -110,7 +116,8 @@
    "sinon": "^18.0.0",
    "split-grid": "^1.0.11",
    "supertest": "^7.0.0",
-    "typescript": "^5.5.3"
+    "typescript": "^5.5.3",
    "vitest": "^2.0.3"
  },
  "engines": {
    "node": ">=18.18.2",
--- a/src/static/js/Builder.ts
+++ b/src/static/js/Builder.ts
@ -62,7 +62,7 @@ export class Builder {
   *     attribute key, value pairs.
   * @returns {Builder} this
   */
-  keepText= (text: string, attribs: string|Attribute[], pool?: AttributePool): Builder=> {
+  keepText= (text: string, attribs?: string|Attribute[], pool?: AttributePool): Builder=> {
    for (const op of opsFromText('=', text, attribs, pool)) this.assem.append(op);
    return this;
  }
@ -89,7 +89,7 @@ export class Builder {
   *     character must be a newline.
   * @returns {Builder} this
   */
-  remove= (N: number, L: number): Builder => {
+  remove= (N: number, L?: number): Builder => {
    this.o.opcode = '-';
    this.o.attribs = '';
    this.o.chars = N;
--- a/src/static/js/Changeset.ts
+++ b/src/static/js/Changeset.ts
@ -445,10 +445,10 @@ export const applyToText = (cs: string, str: string): string => {
 * @param {string} cs - the changeset to apply
 * @param {string[]} lines - The lines to which the changeset needs to be applied
 */
-const mutateTextLines = (cs: string, lines:string[]) => {
+export const mutateTextLines = (cs: string, lines: RegExpMatchArray | null) => {
  const unpacked = unpack(cs);
  const bankIter = new StringIterator(unpacked.charBank);
-  const mut = new TextLinesMutator(lines);
+  const mut = new TextLinesMutator(lines!);
  for (const op of deserializeOps(unpacked.ops)) {
    switch (op.opcode) {
      case '+':
@ -709,7 +709,7 @@ export const identity = (N: number): string => pack(N, N, '', '');
 * @param {AttributePool.ts} [pool] - Attribute pool.
 * @returns {string}
 */
-export const makeSplice = (orig: string, start: number, ndel: number, ins: string, attribs: string | Attribute[] | undefined, pool: AttributePool | null | undefined): string => {
+export const makeSplice = (orig: string, start: number, ndel: number, ins: string|null, attribs?: string | Attribute[] | undefined, pool?: AttributePool | null | undefined): string => {
  if (start < 0) throw new RangeError(`start index must be non-negative (is ${start})`);
  if (ndel < 0) throw new RangeError(`characters to delete must be non-negative (is ${ndel})`);
  if (start > orig.length) start = orig.length;
@ -723,7 +723,7 @@ export const makeSplice = (orig: string, start: number, ndel: number, ins: strin
  })();
  for (const op of ops) assem.append(op);
  assem.endDocument();
-  return pack(orig.length, orig.length + ins.length - ndel, assem.toString(), ins);
+  return pack(orig.length, orig.length + ins!.length - ndel, assem.toString(), ins!);
 };
 /**
@ -932,7 +932,7 @@ export const mapAttribNumbers = (cs: string, func: Function): string => {
 *     attributes
 * @returns {AText}
 */
-export const makeAText = (text: string, attribs: string): AText => ({
+export const makeAText = (text: string, attribs?: string): AText => ({
  text,
  attribs: (attribs || makeAttribution(text)),
 });
@ -1119,7 +1119,7 @@ export const makeAttribsString = (opcode: string, attribs: Attribute[]|string, p
 /**
 * Like "substring" but on a single-line attribution string.
 */
-export const subattribution = (astr: string, start: number, optEnd: number) => {
+export const subattribution = (astr: string, start: number, optEnd?: number) => {
  const attOps = deserializeOps(astr);
  let attOpsNext = attOps.next();
  const assem = new SmartOpAssembler();
@ -1164,9 +1164,7 @@ export const subattribution = (astr: string, start: number, optEnd: number) => {
  return assem.toString();
 };
-export const inverse = (cs: string, lines: string|{
+export const inverse = (cs: string, lines: string|RegExpMatchArray | null, alines: string[]|{
  get: (idx: number) => string,
 }, alines: string|{
  get: (idx: number) => string,
 }, pool: AttributePool) => {
  // lines and alines are what the exports is meant to apply to.
@ -1176,9 +1174,10 @@ export const inverse = (cs: string, lines: string|{
  const linesGet = (idx: number) => {
    // @ts-ignore
    if ("get" in lines) {
      // @ts-ignore
      return lines.get(idx);
    } else {
-      return lines[idx];
+      return lines![idx];
    }
  };
--- a/src/static/js/ChatMessage.ts
+++ b/src/static/js/ChatMessage.ts
@ -8,11 +8,11 @@ import {padUtils} from './pad_utils'
 *
 * Supports serialization to JSON.
 */
-class ChatMessage {
+export class ChatMessage {
  customMetadata: any
  text: string|null
  public authorId: string|null
-  private displayName: string|null
+  displayName: string|null
  time: number|null
  static fromObject(obj: ChatMessage) {
    // The userId property was renamed to authorId, and userName was renamed to displayName. Accept
--- a/src/static/js/TextLinesMutator.ts
+++ b/src/static/js/TextLinesMutator.ts
@ -19,7 +19,7 @@ export class TextLinesMutator {
  /**
   * @param {(string[]|StringArrayLike)} lines - Lines to mutate (in place).
   */
-  constructor(lines: string[]) {
+  constructor(lines: string[]| RegExpMatchArray ) {
    this.lines = lines;
    /**
     * this._curSplice holds values that will be passed as arguments to this._lines.splice() to
--- a/src/static/js/broadcast_revisions.ts
+++ b/src/static/js/broadcast_revisions.ts
@ -25,13 +25,22 @@
 // of the document.  These revisions are connected together by various
 // changesets,  or deltas, between any two revisions.
-const loadBroadcastRevisionsJS = () => {
+type RevisionDelta = {
-  function Revision(revNum) {
+  deltaRev: number;
  deltaTime: number;
  getValue: () => RevisionDelta;
 }
 export class Revision {
  rev: number;
  changesets: RevisionDelta[];
  constructor(revNum: number) {
    this.rev = revNum;
    this.changesets = [];
  }
-  Revision.prototype.addChangeset = function (destIndex, changeset, timeDelta) {
+  addChangeset(destIndex: number, changeset: RevisionDelta, timeDelta: number) {
    const changesetWrapper = {
      deltaRev: destIndex - this.rev,
      deltaTime: timeDelta,
@ -39,34 +48,39 @@ const loadBroadcastRevisionsJS = () => {
    };
    this.changesets.push(changesetWrapper);
    this.changesets.sort((a, b) => (b.deltaRev - a.deltaRev));
-  };
+  }
 }
-  const revisionInfo = {};
+class RevisionInfo {
-  revisionInfo.addChangeset = function (fromIndex, toIndex, changeset, backChangeset, timeDelta) {
+  private revisionInfo: Record<number|string, number|Revision> = {};
-    const startRevision = this[fromIndex] || this.createNew(fromIndex);
+
-    const endRevision = this[toIndex] || this.createNew(toIndex);
+  constructor() {
    this.revisionInfo.latest = window.clientVars.collab_client_vars.rev || -1;
    window.revisionInfo = this.revisionInfo;
  }
  addChangeset =  (fromIndex: number, toIndex: number, changeset: RevisionDelta, backChangeset: RevisionDelta, timeDelta: number)=> {
    const startRevision = (this.revisionInfo[fromIndex] || this.createNew(fromIndex)) as Revision;
    const endRevision = (this.revisionInfo[toIndex] || this.createNew(toIndex)) as Revision;
    startRevision.addChangeset(toIndex, changeset, timeDelta);
    endRevision.addChangeset(fromIndex, backChangeset, -1 * timeDelta);
-  };
+  }
-  revisionInfo.latest = clientVars.collab_client_vars.rev || -1;
+  createNew =  (index: number)=> {
-
+    this.revisionInfo![index] = new Revision(index);
-  revisionInfo.createNew = function (index) {
+    if (index > (this.revisionInfo.latest as number)) {
-    this[index] = new Revision(index);
+      this.revisionInfo.latest = index;
    if (index > this.latest) {
      this.latest = index;
    }
-    return this[index];
+    return this.revisionInfo[index];
-  };
+  }
  // assuming that there is a path from fromIndex to toIndex, and that the links
  // are laid out in a skip-list format
-  revisionInfo.getPath = function (fromIndex, toIndex) {
+  getPath =  (fromIndex: number, toIndex: number)=> {
    const changesets = [];
    const spans = [];
    const times = [];
-    let elem = this[fromIndex] || this.createNew(fromIndex);
+    let elem = (this.revisionInfo[fromIndex] || this.createNew(fromIndex)) as Revision;
    if (elem.changesets.length !== 0 && fromIndex !== toIndex) {
      const reverse = !(fromIndex < toIndex);
      while (((elem.rev < toIndex) && !reverse) || ((elem.rev > toIndex) && reverse)) {
@ -74,21 +88,21 @@ const loadBroadcastRevisionsJS = () => {
        const oldRev = elem.rev;
        for (let i = reverse ? elem.changesets.length - 1 : 0;
-          reverse ? i >= 0 : i < elem.changesets.length;
+             reverse ? i >= 0 : i < elem.changesets.length;
-          i += reverse ? -1 : 1) {
+             i += reverse ? -1 : 1) {
          if (((elem.changesets[i].deltaRev < 0) && !reverse) ||
-              ((elem.changesets[i].deltaRev > 0) && reverse)) {
+            ((elem.changesets[i].deltaRev > 0) && reverse)) {
            couldNotContinue = true;
            break;
          }
          if (((elem.rev + elem.changesets[i].deltaRev <= toIndex) && !reverse) ||
-              ((elem.rev + elem.changesets[i].deltaRev >= toIndex) && reverse)) {
+            ((elem.rev + elem.changesets[i].deltaRev >= toIndex) && reverse)) {
            const topush = elem.changesets[i];
            changesets.push(topush.getValue());
            spans.push(elem.changesets[i].deltaRev);
            times.push(topush.deltaTime);
-            elem = this[elem.rev + elem.changesets[i].deltaRev];
+            elem = this.revisionInfo[elem.rev + elem.changesets[i].deltaRev] as Revision;
            break;
          }
        }
@ -108,8 +122,7 @@ const loadBroadcastRevisionsJS = () => {
      spans,
      times,
    };
-  };
+  }
-  window.revisionInfo = revisionInfo;
+}
 };
-exports.loadBroadcastRevisionsJS = loadBroadcastRevisionsJS;
+export default new RevisionInfo();
--- a/src/static/js/broadcast_slider.js
+++ b/src/static/js/broadcast_slider.js
@ -1,343 +0,0 @@
 'use strict';
 /**
 * This code is mostly from the old Etherpad. Please help us to comment this code.
 * This helps other people to understand this code better and helps them to improve it.
 * TL;DR COMMENTS ON THIS FILE ARE HIGHLY APPRECIATED
 */
 /**
 * Copyright 2009 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS-IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 // These parameters were global, now they are injected. A reference to the
 // Timeslider controller would probably be more appropriate.
 const _ = require('underscore');
 const padmodals = require('./pad_modals').padmodals;
 const colorutils = require('./colorutils').colorutils;
 import html10n from './vendors/html10n';
 const loadBroadcastSliderJS = (fireWhenAllScriptsAreLoaded) => {
  let BroadcastSlider;
  // Hack to ensure timeslider i18n values are in
  $("[data-key='timeslider_returnToPad'] > a > span").html(
      html10n.get('timeslider.toolbar.returnbutton'));
  (() => { // wrap this code in its own namespace
    let sliderLength = 1000;
    let sliderPos = 0;
    let sliderActive = false;
    const slidercallbacks = [];
    const savedRevisions = [];
    let sliderPlaying = false;
    const _callSliderCallbacks = (newval) => {
      sliderPos = newval;
      for (let i = 0; i < slidercallbacks.length; i++) {
        slidercallbacks[i](newval);
      }
    };
    const updateSliderElements = () => {
      for (let i = 0; i < savedRevisions.length; i++) {
        const position = parseInt(savedRevisions[i].attr('pos'));
        savedRevisions[i].css(
            'left', (position * ($('#ui-slider-bar').width() - 2) / (sliderLength * 1.0)) - 1);
      }
      $('#ui-slider-handle').css(
          'left', sliderPos * ($('#ui-slider-bar').width() - 2) / (sliderLength * 1.0));
    };
    const addSavedRevision = (position, info) => {
      const newSavedRevision = $('<div></div>');
      newSavedRevision.addClass('star');
      newSavedRevision.attr('pos', position);
      newSavedRevision.css(
          'left', (position * ($('#ui-slider-bar').width() - 2) / (sliderLength * 1.0)) - 1);
      $('#ui-slider-bar').append(newSavedRevision);
      newSavedRevision.on('mouseup', (evt) => {
        BroadcastSlider.setSliderPosition(position);
      });
      savedRevisions.push(newSavedRevision);
    };
    /* Begin small 'API' */
    const onSlider = (callback) => {
      slidercallbacks.push(callback);
    };
    const getSliderPosition = () => sliderPos;
    const setSliderPosition = (newpos) => {
      newpos = Number(newpos);
      if (newpos < 0 || newpos > sliderLength) return;
      if (!newpos) {
        newpos = 0; // stops it from displaying NaN if newpos isn't set
      }
      window.location.hash = `#${newpos}`;
      $('#ui-slider-handle').css(
          'left', newpos * ($('#ui-slider-bar').width() - 2) / (sliderLength * 1.0));
      $('a.tlink').map(function () {
        $(this).attr('href', $(this).attr('thref').replace('%revision%', newpos));
      });
      $('#revision_label').html(html10n.get('timeslider.version', {version: newpos}));
      $('#leftstar, #leftstep').toggleClass('disabled', newpos === 0);
      $('#rightstar, #rightstep').toggleClass('disabled', newpos === sliderLength);
      sliderPos = newpos;
      _callSliderCallbacks(newpos);
    };
    const getSliderLength = () => sliderLength;
    const setSliderLength = (newlength) => {
      sliderLength = newlength;
      updateSliderElements();
    };
    // just take over the whole slider screen with a reconnect message
    const showReconnectUI = () => {
      padmodals.showModal('disconnected');
    };
    const setAuthors = (authors) => {
      const authorsList = $('#authorsList');
      authorsList.empty();
      let numAnonymous = 0;
      let numNamed = 0;
      const colorsAnonymous = [];
      _.each(authors, (author) => {
        if (author) {
          const authorColor = clientVars.colorPalette[author.colorId] || author.colorId;
          if (author.name) {
            if (numNamed !== 0) authorsList.append(', ');
            const textColor =
                colorutils.textColorFromBackgroundColor(authorColor, clientVars.skinName);
            $('<span />')
                .text(author.name || 'unnamed')
                .css('background-color', authorColor)
                .css('color', textColor)
                .addClass('author')
                .appendTo(authorsList);
            numNamed++;
          } else {
            numAnonymous++;
            if (authorColor) colorsAnonymous.push(authorColor);
          }
        }
      });
      if (numAnonymous > 0) {
        const anonymousAuthorString = html10n.get('timeslider.unnamedauthors', {num: numAnonymous});
        if (numNamed !== 0) {
          authorsList.append(` + ${anonymousAuthorString}`);
        } else {
          authorsList.append(anonymousAuthorString);
        }
        if (colorsAnonymous.length > 0) {
          authorsList.append(' (');
          _.each(colorsAnonymous, (color, i) => {
            if (i > 0) authorsList.append(' ');
            $('<span>&nbsp;</span>')
                .css('background-color', color)
                .addClass('author author-anonymous')
                .appendTo(authorsList);
          });
          authorsList.append(')');
        }
      }
      if (authors.length === 0) {
        authorsList.append(html10n.get('timeslider.toolbar.authorsList'));
      }
    };
    const playButtonUpdater = () => {
      if (sliderPlaying) {
        if (getSliderPosition() + 1 > sliderLength) {
          $('#playpause_button_icon').toggleClass('pause');
          sliderPlaying = false;
          return;
        }
        setSliderPosition(getSliderPosition() + 1);
        setTimeout(playButtonUpdater, 100);
      }
    };
    const playpause = () => {
      $('#playpause_button_icon').toggleClass('pause');
      if (!sliderPlaying) {
        if (getSliderPosition() === sliderLength) setSliderPosition(0);
        sliderPlaying = true;
        playButtonUpdater();
      } else {
        sliderPlaying = false;
      }
    };
    BroadcastSlider = {
      onSlider,
      getSliderPosition,
      setSliderPosition,
      getSliderLength,
      setSliderLength,
      isSliderActive: () => sliderActive,
      playpause,
      addSavedRevision,
      showReconnectUI,
      setAuthors,
    };
    // assign event handlers to html UI elements after page load
    fireWhenAllScriptsAreLoaded.push(() => {
      $(document).on('keyup', (e) => {
        if (!e) e = window.event;
        const code = e.keyCode || e.which;
        if (code === 37) { // left
          if (e.shiftKey) {
            $('#leftstar').trigger('click');
          } else {
            $('#leftstep').trigger('click');
          }
        } else if (code === 39) { // right
          if (e.shiftKey) {
            $('#rightstar').trigger('click');
          } else {
            $('#rightstep').trigger('click');
          }
        } else if (code === 32) { // spacebar
          $('#playpause_button_icon').trigger('click');
        }
      });
      // Resize
      $(window).on('resize', () => {
        updateSliderElements();
      });
      // Slider click
      $('#ui-slider-bar').on('mousedown', (evt) => {
        $('#ui-slider-handle').css('left', (evt.clientX - $('#ui-slider-bar').offset().left));
        $('#ui-slider-handle').trigger(evt);
      });
      // Slider dragging
      $('#ui-slider-handle').on('mousedown', function (evt) {
        this.startLoc = evt.clientX;
        this.currentLoc = parseInt($(this).css('left'));
        sliderActive = true;
        $(document).on('mousemove', (evt2) => {
          $(this).css('pointer', 'move');
          let newloc = this.currentLoc + (evt2.clientX - this.startLoc);
          if (newloc < 0) newloc = 0;
          const maxPos = $('#ui-slider-bar').width() - 2;
          if (newloc > maxPos) newloc = maxPos;
          const version = Math.floor(newloc * sliderLength / maxPos);
          $('#revision_label').html(html10n.get('timeslider.version', {version}));
          $(this).css('left', newloc);
          if (getSliderPosition() !== version) _callSliderCallbacks(version);
        });
        $(document).on('mouseup', (evt2) => {
          $(document).off('mousemove');
          $(document).off('mouseup');
          sliderActive = false;
          let newloc = this.currentLoc + (evt2.clientX - this.startLoc);
          if (newloc < 0) newloc = 0;
          const maxPos = $('#ui-slider-bar').width() - 2;
          if (newloc > maxPos) newloc = maxPos;
          $(this).css('left', newloc);
          setSliderPosition(Math.floor(newloc * sliderLength / maxPos));
          if (parseInt($(this).css('left')) < 2) {
            $(this).css('left', '2px');
          } else {
            this.currentLoc = parseInt($(this).css('left'));
          }
        });
      });
      // play/pause toggling
      $('#playpause_button_icon').on('click', (evt) => {
        BroadcastSlider.playpause();
      });
      // next/prev saved revision and changeset
      $('.stepper').on('click', function (evt) {
        switch ($(this).attr('id')) {
          case 'leftstep':
            setSliderPosition(getSliderPosition() - 1);
            break;
          case 'rightstep':
            setSliderPosition(getSliderPosition() + 1);
            break;
          case 'leftstar': {
            let nextStar = 0; // default to first revision in document
            for (let i = 0; i < savedRevisions.length; i++) {
              const pos = parseInt(savedRevisions[i].attr('pos'));
              if (pos < getSliderPosition() && nextStar < pos) nextStar = pos;
            }
            setSliderPosition(nextStar);
            break;
          }
          case 'rightstar': {
            let nextStar = sliderLength; // default to last revision in document
            for (let i = 0; i < savedRevisions.length; i++) {
              const pos = parseInt(savedRevisions[i].attr('pos'));
              if (pos > getSliderPosition() && nextStar > pos) nextStar = pos;
            }
            setSliderPosition(nextStar);
            break;
          }
        }
      });
      if (clientVars) {
        $('#timeslider-wrapper').show();
        if (window.location.hash.length > 1) {
          const hashRev = Number(window.location.hash.substr(1));
          if (!isNaN(hashRev)) {
            // this is necessary because of the socket.io-event which loads the changesets
            setTimeout(() => { setSliderPosition(hashRev); }, 1);
          }
        }
        setSliderLength(clientVars.collab_client_vars.rev);
        setSliderPosition(clientVars.collab_client_vars.rev);
        _.each(clientVars.savedRevisions, (revision) => {
          addSavedRevision(revision.revNum, revision);
        });
      }
    });
  })();
  BroadcastSlider.onSlider((loc) => {
    $('#viewlatest').html(
        `${loc === BroadcastSlider.getSliderLength() ? 'Viewing' : 'View'} latest content`);
  });
  return BroadcastSlider;
 };
 exports.loadBroadcastSliderJS = loadBroadcastSliderJS;
--- a/src/static/js/broadcast_slider.ts
+++ b/src/static/js/broadcast_slider.ts
@ -0,0 +1,326 @@
 'use strict';
 /**
 * This code is mostly from the old Etherpad. Please help us to comment this code.
 * This helps other people to understand this code better and helps them to improve it.
 * TL;DR COMMENTS ON THIS FILE ARE HIGHLY APPRECIATED
 */
 import {UserInfo} from "./types/SocketIOMessage";
 /**
 * Copyright 2009 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS-IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 // These parameters were global, now they are injected. A reference to the
 // Timeslider controller would probably be more appropriate.
 import _ from 'underscore';
 import {padModals as padmodals} from "./pad_modals";
 import colorutils from "./colorutils";
 import html10n from './vendors/html10n';
 import {PadRevision} from "./types/PadRevision";
 class BroadcastSlider {
  private sliderLength = 1000;
  private sliderPos = 0;
  private sliderActive = false;
  private slidercallbacks: ((val: number)=>void)[] = [];
  private savedRevisions: JQuery<HTMLElement>[] = [];
  private sliderPlaying = false;
  private fireWhenAllScriptsAreLoaded: Function[] = [];
  private startLoc?: number;
  private currentLoc?: number;
  constructor() {
    // Hack to ensure timeslider i18n values are in
    $("[data-key='timeslider_returnToPad'] > a > span").html(
      html10n.get('timeslider.toolbar.returnbutton'))
    // assign event handlers to html UI elements after page load
    this.fireWhenAllScriptsAreLoaded.push(() => {
      $(document).on('keyup', (e) => {
        if (!e) { // @ts-ignore
          e = window.event;
        }
        const code = e.keyCode || e.which;
        if (code === 37) { // left
          if (e.shiftKey) {
            $('#leftstar').trigger('click');
          } else {
            $('#leftstep').trigger('click');
          }
        } else if (code === 39) { // right
          if (e.shiftKey) {
            $('#rightstar').trigger('click');
          } else {
            $('#rightstep').trigger('click');
          }
        } else if (code === 32) { // spacebar
          $('#playpause_button_icon').trigger('click');
        }
      });
      // Resize
      $(window).on('resize', () => {
        this.updateSliderElements();
      });
      // Slider click
      $('#ui-slider-bar').on('mousedown', (evt) => {
        $('#ui-slider-handle').css('left', (evt.clientX - $('#ui-slider-bar').offset()!.left));
        $('#ui-slider-handle').trigger(evt);
      });
      // Slider dragging
      $('#ui-slider-handle').on('mousedown',  (evt)=> {
        this.startLoc = evt.clientX;
        this.currentLoc = parseInt($(this).css('left'));
        this.sliderActive = true;
        $(document).on('mousemove', (evt2) => {
          $(this).css('pointer', 'move');
          let newloc = this.currentLoc! + (evt2.clientX - this.startLoc!);
          if (newloc < 0) newloc = 0;
          const maxPos = $('#ui-slider-bar').width()! - 2;
          if (newloc > maxPos) newloc = maxPos;
          const version = Math.floor(newloc * this.sliderLength / maxPos);
          $('#revision_label').html(html10n.get('timeslider.version', {version}));
          $(this).css('left', newloc);
          if (this.getSliderPosition() !== version) this.callSliderCallbacks(version);
        });
        $(document).on('mouseup', (evt2) => {
          $(document).off('mousemove');
          $(document).off('mouseup');
          this.sliderActive = false;
          let newloc = this.currentLoc! + (evt2.clientX - this.startLoc!);
          if (newloc < 0) newloc = 0;
          const maxPos = $('#ui-slider-bar').width()! - 2;
          if (newloc > maxPos) newloc = maxPos;
          $(this).css('left', newloc);
          this.setSliderPosition(Math.floor(newloc * this.sliderLength / maxPos));
          if (parseInt($(this).css('left')) < 2) {
            $(this).css('left', '2px');
          } else {
            this.currentLoc = parseInt($(this).css('left'));
          }
        });
      });
      // play/pause toggling
      $('#playpause_button_icon').on('click', (evt) => {
        this.playpause();
      });
      // next/prev saved revision and changeset
      $('.stepper').on('click',  (evt)=> {
        switch ($(this).attr('id')) {
          case 'leftstep':
            this.setSliderPosition(this.getSliderPosition() - 1);
            break;
          case 'rightstep':
            this.setSliderPosition(this.getSliderPosition() + 1);
            break;
          case 'leftstar': {
            let nextStar = 0; // default to first revision in document
            for (let i = 0; i < this.savedRevisions.length; i++) {
              const pos = parseInt(this.savedRevisions[i].attr('pos') as string);
              if (pos < this.getSliderPosition() && nextStar < pos) nextStar = pos;
            }
            this.setSliderPosition(nextStar);
            break;
          }
          case 'rightstar': {
            let nextStar = this.sliderLength; // default to last revision in document
            for (let i = 0; i < this.savedRevisions.length; i++) {
              const pos = parseInt(this.savedRevisions[i].attr('pos') as string);
              if (pos > this.getSliderPosition() && nextStar > pos) nextStar = pos;
            }
            this.setSliderPosition(nextStar);
            break;
          }
        }
      });
      if (window.clientVars) {
        $('#timeslider-wrapper').show();
        if (window.location.hash.length > 1) {
          const hashRev = Number(window.location.hash.substr(1));
          if (!isNaN(hashRev)) {
            // this is necessary because of the socket.io-event which loads the changesets
            setTimeout(() => { this.setSliderPosition(hashRev); }, 1);
          }
        }
        this.setSliderLength(window.clientVars.collab_client_vars.rev);
        this.setSliderPosition(window.clientVars.collab_client_vars.rev);
        _.each(window.clientVars.savedRevisions, (revision: PadRevision) => {
          this.addSavedRevision(revision.revNum, revision);
        });
      }
    })
    this.onSlider((loc) => {
      $('#viewlatest').html(
        `${loc === this.getSliderLength() ? 'Viewing' : 'View'} latest content`);
    })
  }
  private callSliderCallbacks = (newval: number) => {
    this.sliderPos = newval;
    for (let i = 0; i < this.slidercallbacks.length; i++) {
      this.slidercallbacks[i](newval);
    }
  }
  updateSliderElements = () => {
    for (let i = 0; i < this.savedRevisions.length; i++) {
      const position = parseInt(this.savedRevisions[i].attr('pos')!);
      this.savedRevisions[i].css(
        'left', (position * ($('#ui-slider-bar').width()! - 2) / (this.sliderLength * 1.0)) - 1);
    }
    $('#ui-slider-handle').css(
      'left', this.sliderPos * ($('#ui-slider-bar').width()! - 2) / (this.sliderLength * 1.0));
  }
  addSavedRevision = (position: number, info?:any) => {
    const newSavedRevision = $('<div></div>');
    newSavedRevision.addClass('star');
    newSavedRevision.attr('pos', position);
    newSavedRevision.css(
      'left', (position * ($('#ui-slider-bar').width()! - 2) / (this.sliderLength * 1.0)) - 1);
    $('#ui-slider-bar').append(newSavedRevision);
    newSavedRevision.on('mouseup', (evt) => {
      this.setSliderPosition(position);
    });
    this.savedRevisions.push(newSavedRevision);
  }
  /* Begin small 'API' */
  onSlider = (callback: (val: number) => void ) => {
    this.slidercallbacks.push(callback);
  }
  getSliderPosition = () => this.sliderPos
  setSliderPosition = (newpos: number) => {
    newpos = Number(newpos);
    if (newpos < 0 || newpos > this.sliderLength) return;
    if (!newpos) {
      newpos = 0; // stops it from displaying NaN if newpos isn't set
    }
    window.location.hash = `#${newpos}`;
    $('#ui-slider-handle').css(
      'left', newpos * ($('#ui-slider-bar').width()! - 2) / (this.sliderLength * 1.0));
    $('a.tlink').map(function () {
      $(this).attr('href', $(this).attr('thref')!.replace('%revision%', String(newpos)));
    });
    $('#revision_label').html(html10n.get('timeslider.version', {version: newpos}));
    $('#leftstar, #leftstep').toggleClass('disabled', newpos === 0);
    $('#rightstar, #rightstep').toggleClass('disabled', newpos === this.sliderLength);
    this.sliderPos = newpos;
    this.callSliderCallbacks(newpos);
  }
  getSliderLength = () => this.sliderLength;
  setSliderLength = (newlength: number) => {
    this.sliderLength = newlength;
    this.updateSliderElements();
  }
  // just take over the whole slider screen with a reconnect message
  showReconnectUI = () => {
    padmodals.showModal('disconnected');
  }
  setAuthors = (authors: UserInfo[]) => {
    const authorsList = $('#authorsList');
    authorsList.empty();
    let numAnonymous = 0;
    let numNamed = 0;
    const colorsAnonymous: number[] = [];
    _.each(authors, (author: UserInfo) => {
      if (author) {
        const authorColor = window.clientVars.colorPalette[author.colorId] || author.colorId;
        if (author.name) {
          if (numNamed !== 0) authorsList.append(', ');
          const textColor =
            colorutils.textColorFromBackgroundColor(authorColor, window.clientVars.skinName);
          $('<span />')
            .text(author.name || 'unnamed')
            .css('background-color', authorColor)
            .css('color', textColor)
            .addClass('author')
            .appendTo(authorsList);
          numNamed++;
        } else {
          numAnonymous++;
          if (authorColor) colorsAnonymous.push(authorColor);
        }
      }
    });
    if (numAnonymous > 0) {
      const anonymousAuthorString = html10n.get('timeslider.unnamedauthors', {num: numAnonymous});
      if (numNamed !== 0) {
        authorsList.append(` + ${anonymousAuthorString}`);
      } else {
        authorsList.append(anonymousAuthorString);
      }
      if (colorsAnonymous.length > 0) {
        authorsList.append(' (');
        _.each(colorsAnonymous, (color: number, i: number) => {
          if (i > 0) authorsList.append(' ');
          $('<span>&nbsp;</span>')
            .css('background-color', color)
            .addClass('author author-anonymous')
            .appendTo(authorsList);
        });
        authorsList.append(')');
      }
    }
    if (authors.length === 0) {
      authorsList.append(html10n.get('timeslider.toolbar.authorsList'));
    }
  }
  playButtonUpdater = () => {
    if (this.sliderPlaying) {
      if (this.getSliderPosition() + 1 > this.sliderLength) {
        $('#playpause_button_icon').toggleClass('pause');
        this.sliderPlaying = false;
        return;
      }
      this.setSliderPosition(this.getSliderPosition() + 1);
      setTimeout(this.playButtonUpdater, 100);
    }
  }
  playpause = () => {
    $('#playpause_button_icon').toggleClass('pause');
    if (!this.sliderPlaying) {
      if (this.getSliderPosition() === this.sliderLength) this.setSliderPosition(0);
      this.sliderPlaying = true;
      this.playButtonUpdater();
    } else {
      this.sliderPlaying = false;
    }
  }
  isSliderActive= () => this.sliderActive
 }
 export default new BroadcastSlider();
--- a/src/static/js/chat.js
+++ b/src/static/js/chat.js
@ -1,280 +0,0 @@
 'use strict';
 /**
 * Copyright 2009 Google Inc., 2011 Peter 'Pita' Martischka (Primary Technology Ltd)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS-IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 const ChatMessage = require('./ChatMessage');
 import {padUtils as padutils} from "./pad_utils";
 import padcookie from "./pad_cookie";
 const Tinycon = require('tinycon/tinycon');
 const hooks = require('./pluginfw/hooks');
 const padeditor = require('./pad_editor').padeditor;
 import html10n from './vendors/html10n';
 // Removes diacritics and lower-cases letters. https://stackoverflow.com/a/37511463
 const normalize = (s) => s.normalize('NFD').replace(/[\u0300-\u036f]/g, '').toLowerCase();
 exports.chat = (() => {
  let isStuck = false;
  let userAndChat = false;
  let chatMentions = 0;
  return {
    show() {
      $('#chaticon').removeClass('visible');
      $('#chatbox').addClass('visible');
      this.scrollDown(true);
      chatMentions = 0;
      Tinycon.setBubble(0);
      $('.chat-gritter-msg').each(function () {
        $.gritter.remove(this.id);
      });
    },
    focus: () => {
      setTimeout(() => {
        $('#chatinput').trigger('focus');
      }, 100);
    },
    // Make chat stick to right hand side of screen
    stickToScreen(fromInitialCall) {
      if ($('#options-stickychat').prop('checked')) {
        $('#options-stickychat').prop('checked', false);
      }
      if (pad.settings.hideChat) {
        return;
      }
      this.show();
      isStuck = (!isStuck || fromInitialCall);
      $('#chatbox').hide();
      // Add timeout to disable the chatbox animations
      setTimeout(() => {
        $('#chatbox, .sticky-container').toggleClass('stickyChat', isStuck);
        $('#chatbox').css('display', 'flex');
      }, 0);
      padcookie.setPref('chatAlwaysVisible', isStuck);
      $('#options-stickychat').prop('checked', isStuck);
    },
    chatAndUsers(fromInitialCall) {
      const toEnable = $('#options-chatandusers').is(':checked');
      if (toEnable || !userAndChat || fromInitialCall) {
        this.stickToScreen(true);
        $('#options-stickychat').prop('checked', true);
        $('#options-chatandusers').prop('checked', true);
        $('#options-stickychat').prop('disabled', true);
        userAndChat = true;
      } else {
        $('#options-stickychat').prop('disabled', false);
        userAndChat = false;
      }
      padcookie.setPref('chatAndUsers', userAndChat);
      $('#users, .sticky-container')
          .toggleClass('chatAndUsers popup-show stickyUsers', userAndChat);
      $('#chatbox').toggleClass('chatAndUsersChat', userAndChat);
    },
    hide() {
      // decide on hide logic based on chat window being maximized or not
      if ($('#options-stickychat').prop('checked')) {
        this.stickToScreen();
        $('#options-stickychat').prop('checked', false);
      } else {
        $('#chatcounter').text('0');
        $('#chaticon').addClass('visible');
        $('#chatbox').removeClass('visible');
      }
    },
    scrollDown(force) {
      if ($('#chatbox').hasClass('visible')) {
        if (force || !this.lastMessage || !this.lastMessage.position() ||
            this.lastMessage.position().top < ($('#chattext').outerHeight() + 20)) {
          // if we use a slow animate here we can have a race condition
          // when a users focus can not be moved away from the last message recieved.
          $('#chattext').animate(
              {scrollTop: $('#chattext')[0].scrollHeight},
              {duration: 400, queue: false});
          this.lastMessage = $('#chattext > p').eq(-1);
        }
      }
    },
    async send() {
      const text = $('#chatinput').val();
      if (text.replace(/\s+/, '').length === 0) return;
      const message = new ChatMessage(text);
      await hooks.aCallAll('chatSendMessage', Object.freeze({message}));
      this._pad.collabClient.sendMessage({type: 'CHAT_MESSAGE', message});
      $('#chatinput').val('');
    },
    async addMessage(msg, increment, isHistoryAdd) {
      msg = ChatMessage.fromObject(msg);
      // correct the time
      msg.time += this._pad.clientTimeOffset;
      if (!msg.authorId) {
        /*
         * If, for a bug or a database corruption, the message coming from the
         * server does not contain the authorId field (see for example #3731),
         * let's be defensive and replace it with "unknown".
         */
        msg.authorId = 'unknown';
        console.warn(
            'The "authorId" field of a chat message coming from the server was not present. ' +
            'Replacing with "unknown". This may be a bug or a database corruption.');
      }
      const authorClass = (authorId) => `author-${authorId.replace(/[^a-y0-9]/g, (c) => {
        if (c === '.') return '-';
        return `z${c.charCodeAt(0)}z`;
      })}`;
      // the hook args
      const ctx = {
        authorName: msg.displayName != null ? msg.displayName : html10n.get('pad.userlist.unnamed'),
        author: msg.authorId,
        text: padutils.escapeHtmlWithClickableLinks(msg.text, '_blank'),
        message: msg,
        rendered: null,
        sticky: false,
        timestamp: msg.time,
        timeStr: (() => {
          let minutes = `${new Date(msg.time).getMinutes()}`;
          let hours = `${new Date(msg.time).getHours()}`;
          if (minutes.length === 1) minutes = `0${minutes}`;
          if (hours.length === 1) hours = `0${hours}`;
          return `${hours}:${minutes}`;
        })(),
        duration: 4000,
      };
      // is the users focus already in the chatbox?
      const alreadyFocused = $('#chatinput').is(':focus');
      // does the user already have the chatbox open?
      const chatOpen = $('#chatbox').hasClass('visible');
      // does this message contain this user's name? (is the current user mentioned?)
      const wasMentioned =
          msg.authorId !== window.clientVars.userId &&
          ctx.authorName !== html10n.get('pad.userlist.unnamed') &&
          normalize(ctx.text).includes(normalize(ctx.authorName));
      // If the user was mentioned, make the message sticky
      if (wasMentioned && !alreadyFocused && !isHistoryAdd && !chatOpen) {
        chatMentions++;
        Tinycon.setBubble(chatMentions);
        ctx.sticky = true;
      }
      await hooks.aCallAll('chatNewMessage', ctx);
      const cls = authorClass(ctx.author);
      const chatMsg = ctx.rendered != null ? $(ctx.rendered) : $('<p>')
          .attr('data-authorId', ctx.author)
          .addClass(cls)
          .append($('<b>').text(`${ctx.authorName}:`))
          .append($('<span>')
              .addClass('time')
              .addClass(cls)
              // Hook functions are trusted to not introduce an XSS vulnerability by adding
              // unescaped user input to ctx.timeStr.
              .html(ctx.timeStr))
          .append(' ')
          // ctx.text was HTML-escaped before calling the hook. Hook functions are trusted to not
          // introduce an XSS vulnerability by adding unescaped user input.
          .append($('<div>').html(ctx.text).contents());
      if (isHistoryAdd) chatMsg.insertAfter('#chatloadmessagesbutton');
      else $('#chattext').append(chatMsg);
      chatMsg.each((i, e) => html10n.translateElement(html10n.translations, e));
      // should we increment the counter??
      if (increment && !isHistoryAdd) {
        // Update the counter of unread messages
        let count = Number($('#chatcounter').text());
        count++;
        $('#chatcounter').text(count);
        if (!chatOpen && ctx.duration > 0) {
          const text = $('<p>')
              .append($('<span>').addClass('author-name').text(ctx.authorName))
              // ctx.text was HTML-escaped before calling the hook. Hook functions are trusted
              // to not introduce an XSS vulnerability by adding unescaped user input.
              .append($('<div>').html(ctx.text).contents());
          text.each((i, e) => html10n.translateElement(html10n.translations, e));
          $.gritter.add({
            text,
            sticky: ctx.sticky,
            time: ctx.duration,
            position: 'bottom',
            class_name: 'chat-gritter-msg',
          });
        }
      }
      if (!isHistoryAdd) this.scrollDown();
    },
    init(pad) {
      this._pad = pad;
      $('#chatinput').on('keydown', (evt) => {
        // If the event is Alt C or Escape & we're already in the chat menu
        // Send the users focus back to the pad
        if ((evt.altKey === true && evt.which === 67) || evt.which === 27) {
          // If we're in chat already..
          $(':focus').trigger('blur'); // required to do not try to remove!
          padeditor.ace.focus(); // Sends focus back to pad
          evt.preventDefault();
          return false;
        }
      });
      // Clear the chat mentions when the user clicks on the chat input box
      $('#chatinput').on('click', () => {
        chatMentions = 0;
        Tinycon.setBubble(0);
      });
      const self = this;
      $('body:not(#chatinput)').on('keypress', function (evt) {
        if (evt.altKey && evt.which === 67) {
          // Alt c focuses on the Chat window
          $(this).trigger('blur');
          self.show();
          $('#chatinput').trigger('focus');
          evt.preventDefault();
        }
      });
      $('#chatinput').on('keypress', (evt) => {
        // if the user typed enter, fire the send
        if (evt.key === 'Enter' && !evt.shiftKey) {
          evt.preventDefault();
          this.send();
        }
      });
      // initial messages are loaded in pad.js' _afterHandshake
      $('#chatcounter').text(0);
      $('#chatloadmessagesbutton').on('click', () => {
        const start = Math.max(this.historyPointer - 20, 0);
        const end = this.historyPointer;
        if (start === end) return; // nothing to load
        $('#chatloadmessagesbutton').css('display', 'none');
        $('#chatloadmessagesball').css('display', 'block');
        pad.collabClient.sendMessage({type: 'GET_CHAT_MESSAGES', start, end});
        this.historyPointer = start;
      });
    },
  };
 })();
--- a/src/static/js/chat.ts
+++ b/src/static/js/chat.ts
@ -0,0 +1,293 @@
 'use strict';
 import {Pad} from "./pad";
 /**
 * Copyright 2009 Google Inc., 2011 Peter 'Pita' Martischka (Primary Technology Ltd)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS-IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 import ChatMessage from './ChatMessage';
 import {padUtils as padutils} from "./pad_utils";
 import padcookie from "./pad_cookie";
 import Tinycon from 'tinycon';
 const hooks = require('./pluginfw/hooks');
 const padeditor = require('./pad_editor').padeditor;
 import html10n from './vendors/html10n';
 // Removes diacritics and lower-cases letters. https://stackoverflow.com/a/37511463
 const normalize = (s: string) => s.normalize('NFD').replace(/[\u0300-\u036f]/g, '').toLowerCase();
 export class Chat {
  private isStuck = false;
  private userAndChat = false;
  private chatMentions = 0;
  private pad?: Pad
  private historyPointer?: number
  private lastMessage?: JQuery<HTMLElement>
  init(pad: Pad) {
    this.pad = pad;
    $('#chatinput').on('keydown', (evt) => {
      // If the event is Alt C or Escape & we're already in the chat menu
      // Send the users focus back to the pad
      if ((evt.altKey === true && evt.which === 67) || evt.which === 27) {
        // If we're in chat already..
        $(':focus').trigger('blur'); // required to do not try to remove!
        padeditor.ace.focus(); // Sends focus back to pad
        evt.preventDefault();
        return false;
      }
    });
    // Clear the chat mentions when the user clicks on the chat input box
    $('#chatinput').on('click', () => {
      this.chatMentions = 0;
      Tinycon.setBubble(0);
    });
    const self = this;
    $('body:not(#chatinput)').on('keypress', function (evt) {
      if (evt.altKey && evt.which === 67) {
        // Alt c focuses on the Chat window
        $(this).trigger('blur');
        self.show();
        $('#chatinput').trigger('focus');
        evt.preventDefault();
      }
    });
    $('#chatinput').on('keypress', (evt) => {
      // if the user typed enter, fire the send
      if (evt.key === 'Enter' && !evt.shiftKey) {
        evt.preventDefault();
        this.send();
      }
    });
    // initial messages are loaded in pad.js' _afterHandshake
    $('#chatcounter').text(0);
    $('#chatloadmessagesbutton').on('click', () => {
      const start = Math.max(this.historyPointer! - 20, 0);
      const end = this.historyPointer!;
      if (start === end) return; // nothing to load
      $('#chatloadmessagesbutton').css('display', 'none');
      $('#chatloadmessagesball').css('display', 'block');
      pad.collabClient!.sendMessage({type: 'GET_CHAT_MESSAGES', start, end});
      this.historyPointer = start;
    });
  }
  show() {
    $('#chaticon').removeClass('visible');
    $('#chatbox').addClass('visible');
    this.scrollDown(true);
    this.chatMentions = 0;
    Tinycon.setBubble(0);
    $('.chat-gritter-msg').each(function () {
      // @ts-ignore
      $.gritter.remove(this.id);
    });
  }
  focus = () => {
    setTimeout(() => {
      $('#chatinput').trigger('focus');
    }, 100);
  }
  // Make chat stick to right hand side of screen
  stickToScreen(fromInitialCall?: boolean) {
    if ($('#options-stickychat').prop('checked')) {
      $('#options-stickychat').prop('checked', false);
    }
    if (pad.settings.hideChat) {
      return;
    }
    this.show();
    this.isStuck = (!this.isStuck || fromInitialCall)!;
    $('#chatbox').hide();
    // Add timeout to disable the chatbox animations
    setTimeout(() => {
      $('#chatbox, .sticky-container').toggleClass('stickyChat', this.isStuck);
      $('#chatbox').css('display', 'flex');
    }, 0);
    padcookie.setPref('chatAlwaysVisible', this.isStuck);
    $('#options-stickychat').prop('checked', this.isStuck);
  }
  chatAndUsers(fromInitialCall: boolean) {
    const toEnable = $('#options-chatandusers').is(':checked');
    if (toEnable || !this.userAndChat || fromInitialCall) {
      this.stickToScreen(true);
      $('#options-stickychat').prop('checked', true);
      $('#options-chatandusers').prop('checked', true);
      $('#options-stickychat').prop('disabled', true);
      this.userAndChat = true;
    } else {
      $('#options-stickychat').prop('disabled', false);
      this.userAndChat = false;
    }
    padcookie.setPref('chatAndUsers', this.userAndChat);
    $('#users, .sticky-container')
      .toggleClass('chatAndUsers popup-show stickyUsers', this.userAndChat);
    $('#chatbox').toggleClass('chatAndUsersChat', this.userAndChat);
  }
  hide() {
    // decide on hide logic based on chat window being maximized or not
    if ($('#options-stickychat').prop('checked')) {
      this.stickToScreen();
      $('#options-stickychat').prop('checked', false);
    } else {
      $('#chatcounter').text('0');
      $('#chaticon').addClass('visible');
      $('#chatbox').removeClass('visible');
    }
  }
  scrollDown = (force?:boolean)=> {
    if ($('#chatbox').hasClass('visible')) {
      if (force || !this.lastMessage || !this.lastMessage.position() ||
        this.lastMessage.position().top < ($('#chattext').outerHeight()! + 20)) {
        // if we use a slow animate here we can have a race condition
        // when a users focus can not be moved away from the last message recieved.
        $('#chattext').animate(
          {scrollTop: $('#chattext')[0].scrollHeight},
          {duration: 400, queue: false});
        this.lastMessage = $('#chattext > p').eq(-1);
      }
    }
  }
  send = async () => {
    const text = $('#chatinput').val() as string;
    if (text.replace(/\s+/, '').length === 0) return;
    const message = new ChatMessage(text);
    await hooks.aCallAll('chatSendMessage', Object.freeze({message}));
    this.pad!.collabClient!.sendMessage({type: 'CHAT_MESSAGE', message});
    $('#chatinput').val('');
  }
  addMessage = async (msg: ChatMessage, increment: boolean, isHistoryAdd: boolean) => {
    msg = ChatMessage.fromObject(msg);
    // correct the time
    msg.time! += this.pad!.clientTimeOffset!;
    if (!msg.authorId) {
      /*
       * If, for a bug or a database corruption, the message coming from the
       * server does not contain the authorId field (see for example #3731),
       * let's be defensive and replace it with "unknown".
       */
      msg.authorId = 'unknown';
      console.warn(
        'The "authorId" field of a chat message coming from the server was not present. ' +
        'Replacing with "unknown". This may be a bug or a database corruption.');
    }
    const authorClass = (authorId: string) => `author-${authorId.replace(/[^a-y0-9]/g, (c) => {
      if (c === '.') return '-';
      return `z${c.charCodeAt(0)}z`;
    })}`;
    // the hook args
    const ctx = {
      authorName: msg.displayName != null ? msg.displayName : html10n.get('pad.userlist.unnamed'),
      author: msg.authorId,
      text: padutils.escapeHtmlWithClickableLinks(msg.text!, '_blank'),
      message: msg,
      rendered: null,
      sticky: false,
      timestamp: msg.time,
      timeStr: (() => {
        let minutes = `${new Date(msg.time!).getMinutes()}`;
        let hours = `${new Date(msg.time!).getHours()}`;
        if (minutes.length === 1) minutes = `0${minutes}`;
        if (hours.length === 1) hours = `0${hours}`;
        return `${hours}:${minutes}`;
      })(),
      duration: 4000,
    };
    // is the users focus already in the chatbox?
    const alreadyFocused = $('#chatinput').is(':focus');
    // does the user already have the chatbox open?
    const chatOpen = $('#chatbox').hasClass('visible');
    // does this message contain this user's name? (is the current user mentioned?)
    const wasMentioned =
      msg.authorId !== window.clientVars.userId &&
      ctx.authorName !== html10n.get('pad.userlist.unnamed') &&
      normalize(ctx.text).includes(normalize(ctx.authorName));
    // If the user was mentioned, make the message sticky
    if (wasMentioned && !alreadyFocused && !isHistoryAdd && !chatOpen) {
      this.chatMentions++;
      Tinycon.setBubble(this.chatMentions);
      ctx.sticky = true;
    }
    await hooks.aCallAll('chatNewMessage', ctx);
    const cls = authorClass(ctx.author);
    const chatMsg = ctx.rendered != null ? $(ctx.rendered) : $('<p>')
      .attr('data-authorId', ctx.author)
      .addClass(cls)
      .append($('<b>').text(`${ctx.authorName}:`))
      .append($('<span>')
        .addClass('time')
        .addClass(cls)
        // Hook functions are trusted to not introduce an XSS vulnerability by adding
        // unescaped user input to ctx.timeStr.
        .html(ctx.timeStr))
      .append(' ')
      // ctx.text was HTML-escaped before calling the hook. Hook functions are trusted to not
      // introduce an XSS vulnerability by adding unescaped user input.
      .append($('<div>').html(ctx.text).contents());
    if (isHistoryAdd) chatMsg.insertAfter('#chatloadmessagesbutton');
    else $('#chattext').append(chatMsg);
    chatMsg.each((i, e) => html10n.translateElement(html10n.translations, e));
    // should we increment the counter??
    if (increment && !isHistoryAdd) {
      // Update the counter of unread messages
      let count = Number($('#chatcounter').text());
      count++;
      $('#chatcounter').text(count);
      if (!chatOpen && ctx.duration > 0) {
        const text = $('<p>')
          .append($('<span>').addClass('author-name').text(ctx.authorName))
          // ctx.text was HTML-escaped before calling the hook. Hook functions are trusted
          // to not introduce an XSS vulnerability by adding unescaped user input.
          .append($('<div>').html(ctx.text).contents());
        text.each((i, e) => html10n.translateElement(html10n.translations, e));
        // @ts-ignore
        $.gritter.add({
          text,
          sticky: ctx.sticky,
          time: ctx.duration,
          position: 'bottom',
          class_name: 'chat-gritter-msg',
        });
      }
    }
    if (!isHistoryAdd) this.scrollDown();
  }
 }
 export const chat = new Chat()
--- a/src/static/js/collab_client.ts
+++ b/src/static/js/collab_client.ts
@ -367,18 +367,17 @@ export class CollabClient {
  tellAceAuthorInfo = (userId: string, colorId: number|object, inactive?: boolean) => {
    if (typeof colorId === 'number') {
      // @ts-ignore
      colorId = window.clientVars.colorPalette[colorId];
    }
    const cssColor = colorId;
    if (inactive) {
      // @ts-ignore
      this.editor.setAuthorInfo(userId, {
        bgcolor: cssColor,
        fade: 0.5,
      });
    } else {
      // @ts-ignore
      this.editor.setAuthorInfo(userId, {
        bgcolor: cssColor,
      });
--- a/src/static/js/contentcollector.ts
+++ b/src/static/js/contentcollector.ts
@ -142,11 +142,11 @@ class ContentCollector {
  private selEnd = [-1, -1];
  private collectStyles: boolean;
  private apool: AttributePool;
-  private className2Author: (c: string) => string;
+  private className2Author?: (c: string) => string;
  private breakLine?: boolean
  private abrowser?: null|BrowserDetector;
-  constructor(collectStyles: boolean, abrowser: null, apool: AttributePool, className2Author: (c: string)=>string) {
+  constructor(collectStyles: boolean, abrowser: null, apool: AttributePool, className2Author?: (c: string)=>string) {
    this.blockElems = {
      div: 1,
      p: 1,
@ -352,7 +352,7 @@ class ContentCollector {
    this.incrementAttrib(state, na);
  }
-  collectContent =  (node: ContentElem, state: ContentCollectorState)=> {
+  collectContent =  (node: ContentElem, state?: ContentCollectorState)=> {
    let unsupportedElements = null;
    if (!state) {
      state = {
@ -764,3 +764,5 @@ class ContentCollector {
    };
  }
 }
 export default ContentCollector
--- a/src/static/js/pad.ts
+++ b/src/static/js/pad.ts
@ -410,7 +410,7 @@ export class Pad {
    collabDiagnosticInfo?: any
  };
  private initTime: number;
-  private clientTimeOffset: null | number;
+  public clientTimeOffset: null | number;
  _messageQ: MessageQueue;
  private padOptions: PadOption;
  settings: PadSettings = {
--- a/src/static/js/pad_cookie.ts
+++ b/src/static/js/pad_cookie.ts
@ -62,7 +62,7 @@ class PadCookie {
    return this.readPrefs_()[prefName];
  }
-  setPref(prefName: string, value: string) {
+  setPref(prefName: string, value: any) {
    const prefs = this.readPrefs_();
    prefs[prefName] = value;
    this.writePrefs_(prefs);
--- a/src/static/js/pad_userlist.ts
+++ b/src/static/js/pad_userlist.ts
@ -629,7 +629,7 @@ class PadUserList {
      if (!colorPickerSetup) {
        const colorsList = $('#colorpickerswatches');
-        for (let i = 0; i < palette.length; i++) {
+        for (let i = 0; i < palette.length!; i++) {
          const li = $('<li>', {
            style: `background: ${palette[i]};`,
          });
--- a/src/static/js/pluginfw/IPluginInfoExtended.ts
+++ b/src/static/js/pluginfw/IPluginInfoExtended.ts
@ -0,0 +1,6 @@
 import {IPluginInfo} from "live-plugin-manager";
 export type IPluginInfoExtended = IPluginInfo & {
  path?: string
  realPath? : string
 }
--- a/src/static/js/pluginfw/LinkInstaller.ts
+++ b/src/static/js/pluginfw/LinkInstaller.ts
@ -6,6 +6,7 @@ import {dependencies, name} from '../../../package.json'
 import {pathToFileURL} from 'node:url';
 const settings = require('../../../node/utils/Settings');
 import {readFileSync} from "fs";
 import {IPluginInfoExtended} from "./IPluginInfoExtended";
 export class LinkInstaller {
    private livePluginManager: PluginManager;
@ -46,7 +47,7 @@ export class LinkInstaller {
    public async installPlugin(pluginName: string, version?: string) {
        if (version) {
-            const installedPlugin = await this.livePluginManager.install(pluginName, version);
+            const installedPlugin = await this.livePluginManager.install(pluginName, version) as IPluginInfoExtended;
            this.linkDependency(pluginName)
            await this.checkLinkedDependencies(installedPlugin)
        } else {
@ -57,7 +58,7 @@ export class LinkInstaller {
    }
    public async listPlugins() {
-        const plugins = this.livePluginManager.list()
+        const plugins = this.livePluginManager.list() as IPluginInfoExtended[]
        if (plugins && plugins.length > 0 && this.loadedPlugins.length == 0) {
            this.loadedPlugins = plugins
            // Check already installed plugins
@ -224,7 +225,6 @@ export class LinkInstaller {
        }
    }
    private async checkLinkedDependencies(plugin: IPluginInfo) {
        // Check if the plugin really exists at source
        try {
--- a/src/static/js/pluginfw/client_plugins.js
+++ b/src/static/js/pluginfw/client_plugins.js
@ -1,47 +0,0 @@
 'use strict';
 const pluginUtils = require('./shared');
 const defs = require('./plugin_defs');
 exports.baseURL = '';
 exports.ensure = (cb) => !defs.loaded ? exports.update(cb) : cb();
 exports.update = async (modules) => {
  const data = await jQuery.getJSON(
    `${exports.baseURL}pluginfw/plugin-definitions.json?v=${clientVars.randomVersionString}`);
  defs.plugins = data.plugins;
  defs.parts = data.parts;
  defs.hooks = pluginUtils.extractHooks(defs.parts, 'client_hooks', null, modules);
  defs.loaded = true;
 };
 const adoptPluginsFromAncestorsOf = (frame) => {
  // Bind plugins with parent;
  let parentRequire = null;
  try {
    while ((frame = frame.parent)) {
      if (typeof (frame.require) !== 'undefined') {
        parentRequire = frame.require;
        break;
      }
    }
  } catch (error) {
    // Silence (this can only be a XDomain issue).
    console.error(error);
  }
  if (!parentRequire) throw new Error('Parent plugins could not be found.');
  const ancestorPluginDefs = parentRequire('ep_etherpad-lite/static/js/pluginfw/plugin_defs');
  defs.hooks = ancestorPluginDefs.hooks;
  defs.loaded = ancestorPluginDefs.loaded;
  defs.parts = ancestorPluginDefs.parts;
  defs.plugins = ancestorPluginDefs.plugins;
  const ancestorPlugins = parentRequire('ep_etherpad-lite/static/js/pluginfw/client_plugins');
  exports.baseURL = ancestorPlugins.baseURL;
  exports.ensure = ancestorPlugins.ensure;
  exports.update = ancestorPlugins.update;
 };
 exports.adoptPluginsFromAncestorsOf = adoptPluginsFromAncestorsOf;
--- a/src/static/js/pluginfw/client_plugins.ts
+++ b/src/static/js/pluginfw/client_plugins.ts
@ -0,0 +1,18 @@
 'use strict';
 import {pluginDefs, PluginResp} from './plugin_defs'
 import {extractHooks} from "./shared";
 export const baseURL = '';
 export const ensure = (cb: Function) => !pluginDefs.isLoaded() ? update(cb) : cb();
 export const update = async (modules: Function) => {
  const data = await jQuery.getJSON(
    `${baseURL}pluginfw/plugin-definitions.json?v=${window.clientVars.randomVersionString}`) as PluginResp;
  pluginDefs.setParts(data.parts)
  pluginDefs.setPlugins(data.plugins)
  const hooks = extractHooks(pluginDefs.getParts(), 'client_hooks', null, modules)!
  pluginDefs.setHooks(hooks)
  pluginDefs.setLoaded(true)
 };
--- a/src/static/js/pluginfw/hooks.ts
+++ b/src/static/js/pluginfw/hooks.ts
@ -1,6 +1,9 @@
 'use strict';
-const pluginDefs = require('./plugin_defs');
+import {PluginHook} from "./plugin_defs";
 import {MapArrayType} from "../../../node/types/MapType";
 import {pluginDefs} from './plugin_defs';
 // Maps the name of a server-side hook to a string explaining the deprecation
 // (e.g., 'use the foo hook instead').
@ -10,12 +13,12 @@ const pluginDefs = require('./plugin_defs');
 //     const hooks = require('ep_etherpad-lite/static/js/pluginfw/hooks');
 //     hooks.deprecationNotices.fooBar = 'use the newSpiffy hook instead';
 //
-exports.deprecationNotices = {};
+export const deprecationNotices: MapArrayType<string> = {};
-const deprecationWarned = {};
+const deprecationWarned: MapArrayType<boolean> = {};
-const checkDeprecation = (hook) => {
+const checkDeprecation = (hook: PluginHook) => {
-  const notice = exports.deprecationNotices[hook.hook_name];
+  const notice = deprecationNotices[hook.hook_name];
  if (notice == null) return;
  if (deprecationWarned[hook.hook_fn_name]) return;
  console.warn(`${hook.hook_name} hook used by the ${hook.part.plugin} plugin ` +
@ -26,7 +29,7 @@ const checkDeprecation = (hook) => {
 // Calls the node-style callback when the Promise settles. Unlike util.callbackify, this takes a
 // Promise (rather than a function that returns a Promise), and it returns a Promise (rather than a
 // function that returns undefined).
-const attachCallback = (p, cb) => p.then(
+const attachCallback = (p: Promise<any>, cb: Function) => p.then(
    (val) => cb(null, val),
    // Callbacks often only check the truthiness, not the nullness, of the first parameter. To avoid
    // problems, always pass a truthy value as the first argument if the Promise is rejected.
@ -35,7 +38,7 @@ const attachCallback = (p, cb) => p.then(
 // Normalizes the value provided by hook functions so that it is always an array. `undefined` (but
 // not `null`!) becomes an empty array, array values are returned unmodified, and non-array values
 // are wrapped in an array (so `null` becomes `[null]`).
-const normalizeValue = (val) => {
+const normalizeValue = (val: string|number|string[]|number[]) => {
  // `undefined` is treated the same as `[]`. IMPORTANT: `null` is *not* treated the same as `[]`
  // because some hooks use `null` as a special value.
  if (val === undefined) return [];
@ -44,7 +47,7 @@ const normalizeValue = (val) => {
 };
 // Flattens the array one level.
-const flatten1 = (array) => array.reduce((a, b) => a.concat(b), []);
+const flatten1 = (array: any[]) => array.reduce<any[]>((a, b) => a.concat(b), []);
 // Calls the hook function synchronously and returns the value provided by the hook function (via
 // callback or return value).
@ -75,16 +78,25 @@ const flatten1 = (array) => array.reduce((a, b) => a.concat(b), []);
 // See the tests in src/tests/backend/specs/hooks.js for examples of supported and prohibited
 // behaviors.
 //
-const callHookFnSync = (hook, context) => {
+type OutCome = {
  state: string,
  err: Error|null,
  val: any,
  how: string,
 }
 const callHookFnSync = (hook: PluginHook, context: {
 }) => {
  checkDeprecation(hook);
  // This var is used to keep track of whether the hook function already settled.
-  let outcome;
+  let outcome: OutCome;
  // This is used to prevent recursion.
  let doubleSettleErr;
-  const settle = (err, val, how) => {
+  const settle = (err: Error|null, val: any|null, how: string) => {
    doubleSettleErr = null;
    const state = err == null ? 'resolved' : 'rejected';
    if (outcome != null) {
@ -113,14 +125,14 @@ const callHookFnSync = (hook, context) => {
  // IMPORTANT: This callback must return `undefined` so that a hook function can safely do
  // `return callback(value);` for backwards compatibility.
-  const callback = (ret) => {
+  const callback = (ret: string) => {
    settle(null, ret, 'callback');
  };
  let val;
  try {
    val = hook.hook_fn(hook.hook_name, context, callback);
-  } catch (err) {
+  } catch (err:any) {
    if (err === doubleSettleErr) throw err; // Avoid recursion.
    try {
      settle(err, null, 'thrown exception');
@ -137,6 +149,7 @@ const callHookFnSync = (hook, context) => {
  // IMPORTANT: This MUST check for undefined -- not nullish -- because some hooks intentionally use
  // null as a special value.
  if (val === undefined) {
    // @ts-ignore
    if (outcome != null) return outcome.val; // Already settled via callback.
    if (hook.hook_fn.length >= 3) {
      console.error(`UNSETTLED FUNCTION BUG IN HOOK FUNCTION (plugin: ${hook.part.plugin}, ` +
@ -173,7 +186,7 @@ const callHookFnSync = (hook, context) => {
  }
  settle(null, val, 'returned value');
-  return outcome.val;
+  return outcome!.val;
 };
 // DEPRECATED: Use `callAllSerial()` or `aCallAll()` instead.
@ -189,9 +202,11 @@ const callHookFnSync = (hook, context) => {
 //     1. Collect all values returned by the hook functions into an array.
 //     2. Convert each `undefined` entry into `[]`.
 //     3. Flatten one level.
-exports.callAll = (hookName, context) => {
+export const callAll = (hookName: string, context?: {
 }) => {
  if (context == null) context = {};
-  const hooks = pluginDefs.hooks[hookName] || [];
+  const hooks = pluginDefs.getHooks()[hookName] || [];
  return flatten1(hooks.map((hook) => normalizeValue(callHookFnSync(hook, context))));
 };
@ -230,13 +245,13 @@ exports.callAll = (hookName, context) => {
 // See the tests in src/tests/backend/specs/hooks.js for examples of supported and prohibited
 // behaviors.
 //
-const callHookFnAsync = async (hook, context) => {
+const callHookFnAsync = async (hook: PluginHook, context: {}) => {
  checkDeprecation(hook);
  return await new Promise((resolve, reject) => {
    // This var is used to keep track of whether the hook function already settled.
-    let outcome;
+    let outcome: OutCome;
-    const settle = (err, val, how) => {
+    const settle = (err: Error|null, val: string|null, how: string) => {
      const state = err == null ? 'resolved' : 'rejected';
      if (outcome != null) {
        // It was already settled, which indicates a bug.
@ -258,7 +273,7 @@ const callHookFnAsync = async (hook, context) => {
    // IMPORTANT: This callback must return `undefined` so that a hook function can safely do
    // `return callback(value);` for backwards compatibility.
-    const callback = (ret) => {
+    const callback = (ret:any) => {
      // Wrap ret in a Promise so that a hook function can do `callback(asyncFunction());`. Note: If
      // ret is a Promise (or other thenable), Promise.resolve() will flatten it into this new
      // Promise.
@ -270,7 +285,7 @@ const callHookFnAsync = async (hook, context) => {
    let ret;
    try {
      ret = hook.hook_fn(hook.hook_name, context, callback);
-    } catch (err) {
+    } catch (err:any) {
      try {
        settle(err, null, 'thrown exception');
      } catch (doubleSettleErr) {
@ -342,24 +357,26 @@ const callHookFnAsync = async (hook, context) => {
 //     2. Convert each `undefined` entry into `[]`.
 //     3. Flatten one level.
 //   If cb is non-null, this function resolves to the value returned by cb.
-exports.aCallAll = async (hookName, context, cb = null) => {
+export const aCallAll = async (hookName: string, context?: {}, cb = null): Promise<any[]> => {
-  if (cb != null) return await attachCallback(exports.aCallAll(hookName, context), cb);
+  if (cb != null) return await attachCallback(aCallAll(hookName, context), cb);
  if (context == null) context = {};
-  const hooks = pluginDefs.hooks[hookName] || [];
+  const hooks = pluginDefs.getHooks()[hookName] || [];
  const results = await Promise.all(
-      hooks.map(async (hook) => normalizeValue(await callHookFnAsync(hook, context))));
+      hooks.map(async (hook) => normalizeValue(await callHookFnAsync(hook, context) as any)));
  return flatten1(results);
 };
 // Like `aCallAll()` except the hook functions are called one at a time instead of concurrently.
 // Only use this function if the hook functions must be called one at a time, otherwise use
 // `aCallAll()`.
-exports.callAllSerial = async (hookName, context) => {
+export const callAllSerial = async (hookName: string, context: {
 }) => {
  if (context == null) context = {};
-  const hooks = pluginDefs.hooks[hookName] || [];
+  const hooks = pluginDefs.getHooks()[hookName] || [];
  const results = [];
  for (const hook of hooks) {
-    results.push(normalizeValue(await callHookFnAsync(hook, context)));
+    results.push(normalizeValue(await callHookFnAsync(hook, context) as any));
  }
  return flatten1(results);
 };
@ -367,10 +384,10 @@ exports.callAllSerial = async (hookName, context) => {
 // DEPRECATED: Use `aCallFirst()` instead.
 //
 // Like `aCallFirst()`, but synchronous. Hook functions must provide their values synchronously.
-exports.callFirst = (hookName, context) => {
+export const callFirst = (hookName: string, context: {}) => {
  if (context == null) context = {};
-  const predicate = (val) => val.length;
+  const predicate = (val: (string|number)[]) => val.length;
-  const hooks = pluginDefs.hooks[hookName] || [];
+  const hooks = pluginDefs.getHooks()[hookName] || [];
  for (const hook of hooks) {
    const val = normalizeValue(callHookFnSync(hook, context));
    if (predicate(val)) return val;
@ -399,22 +416,24 @@ exports.callFirst = (hookName, context) => {
 //   If cb is nullish, resolves to an array that is either the normalized value that satisfied the
 //   predicate or empty if the predicate was never satisfied. If cb is non-nullish, resolves to the
 //   value returned from cb().
-exports.aCallFirst = async (hookName, context, cb = null, predicate = null) => {
+export const aCallFirst = async (hookName: string, context:{}, cb: Function|null = null, predicate: ((val: any[])=>number)|null = null):Promise<any> => {
  if (cb != null) {
-    return await attachCallback(exports.aCallFirst(hookName, context, null, predicate), cb);
+    return await attachCallback(aCallFirst(hookName, context, null, predicate), cb);
  }
  if (context == null) context = {};
-  if (predicate == null) predicate = (val) => val.length;
+  if (predicate == null) {
-  const hooks = pluginDefs.hooks[hookName] || [];
+    predicate = (val) => val.length;
  }
  const hooks = pluginDefs.getHooks()[hookName] || [];
  for (const hook of hooks) {
-    const val = normalizeValue(await callHookFnAsync(hook, context));
+    const val = normalizeValue(await callHookFnAsync(hook, context) as any);
    if (predicate(val)) return val;
  }
  return [];
 };
-exports.exportedForTestingOnly = {
+export const exportedForTestingOnly = {
  callHookFnAsync,
  callHookFnSync,
  deprecationWarned,
-};
+}
--- a/src/static/js/pluginfw/plugin_defs.js
+++ b/src/static/js/pluginfw/plugin_defs.js
@ -1,28 +0,0 @@
 'use strict';
 // This module contains processed plugin definitions. The data structures in this file are set by
 // plugins.js (server) or client_plugins.js (client).
 // Maps a hook name to a list of hook objects. Each hook object has the following properties:
 //   * hook_name: Name of the hook.
 //   * hook_fn: Plugin-supplied hook function.
 //   * hook_fn_name: Name of the hook function, with the form <filename>:<functionName>.
 //   * part: The ep.json part object that declared the hook. See exports.plugins.
 exports.hooks = {};
 // Whether the plugins have been loaded.
 exports.loaded = false;
 // Topologically sorted list of parts from exports.plugins.
 exports.parts = [];
 // Maps the name of a plugin to the plugin's definition provided in ep.json. The ep.json object is
 // augmented with additional metadata:
 //   * parts: Each part from the ep.json object is augmented with the following properties:
 //       - plugin: The name of the plugin.
 //       - full_name: Equal to <plugin>/<name>.
 //   * package (server-side only): Object containing details about the plugin package:
 //       - version
 //       - path
 //       - realPath
 exports.plugins = {};
--- a/src/static/js/pluginfw/plugin_defs.ts
+++ b/src/static/js/pluginfw/plugin_defs.ts
@ -0,0 +1,98 @@
 'use strict';
 // This module contains processed plugin definitions. The data structures in this file are set by
 // plugins.js (server) or client_plugins.js (client).
 // Maps a hook name to a list of hook objects. Each hook object has the following properties:
 //   * hook_name: Name of the hook.
 //   * hook_fn: Plugin-supplied hook function.
 //   * hook_fn_name: Name of the hook function, with the form <filename>:<functionName>.
 //   * part: The ep.json part object that declared the hook. See exports.plugins.
 import {MapArrayType} from "../../../node/types/MapType";
 class PluginDef {
  private hooks: MapArrayType<PluginHook[]>
  private loaded: boolean
  private parts: MappedPlugin[]
  private plugins: MapArrayType<any>
  constructor() {
    this.hooks = {}
    this.loaded = false
    // Topologically sorted list of parts from exports.plugins.
    this.parts = []
    // Maps the name of a plugin to the plugin's definition provided in ep.json. The ep.json object is
 // augmented with additional metadata:
 //   * parts: Each part from the ep.json object is augmented with the following properties:
 //       - plugin: The name of the plugin.
 //       - full_name: Equal to <plugin>/<name>.
 //   * package (server-side only): Object containing details about the plugin package:
 //       - version
 //       - path
 //       - realPath
    this.plugins = {}
  }
  getHooks() {
    return this.hooks
  }
  isLoaded() {
    return this.loaded
  }
  getParts() {
    return this.parts
  }
  getPlugins() {
    return this.plugins
  }
  setHooks(hooks: MapArrayType<PluginHook[]>) {
    this.hooks = hooks
  }
  setLoaded(loaded: boolean) {
    this.loaded = loaded
  }
  setParts(parts: any[]) {
    this.parts = parts
  }
  setPlugins(plugins: MapArrayType<any>) {
    this.plugins = plugins
  }
 }
 export type PluginResp = {
  plugins: MapArrayType<Plugin>
  parts:  MappedPlugin[]
 }
 export type MappedPlugin = Part& {
  plugin: string
  full_name: string
 }
 export type Plugin = {
  parts: Part[]
 }
 export type Part = {
  name: string,
  client_hooks: MapArrayType<string>,
  hooks: MapArrayType<string>
  pre?: string[]
  post?: string[]
  plugin?: string
 }
 export type PluginHook = {
  hook_name: string
  hook_fn: Function
  hook_fn_name: string
  part: Part
 }
 export const pluginDefs = new PluginDef()
--- a/src/static/js/pluginfw/plugins.ts
+++ b/src/static/js/pluginfw/plugins.ts
@ -1,13 +1,16 @@
 'use strict';
 import {Part} from "./plugin_defs";
 const fs = require('fs').promises;
 const hooks = require('./hooks');
-const log4js = require('log4js');
+import log4js from 'log4js';
-const path = require('path');
+import path from 'path';
 const runCmd = require('../../../node/utils/run_cmd');
-const tsort = require('./tsort');
+import {TSort} from './tsort';
 const pluginUtils = require('./shared');
-const defs = require('./plugin_defs');
+import {pluginDefs} from './plugin_defs';
 import {IPluginInfo} from "live-plugin-manager";
 const settings = require('../../../node/utils/Settings');
 const logger = log4js.getLogger('plugins');
@ -18,53 +21,54 @@ const logger = log4js.getLogger('plugins');
    const version = await runCmd(['pnpm', '--version'], {stdio: [null, 'string']});
    logger.info(`pnpm --version: ${version}`);
  } catch (err) {
    // @ts-ignore
    logger.error(`Failed to get pnpm version: ${err.stack || err}`);
    // This isn't a fatal error so don't re-throw.
  }
 })();
-exports.prefix = 'ep_';
+export const prefix = 'ep_';
-exports.formatPlugins = () => Object.keys(defs.plugins).join(', ');
+export const formatPlugins = () => Object.keys(pluginDefs.getPlugins()).join(', ');
-exports.getPlugins = () => Object.keys(defs.plugins);
+export const getPlugins = () => Object.keys(pluginDefs.getPlugins());
-exports.formatParts = () => defs.parts.map((part) => part.full_name).join('\n');
+export const formatParts = () => pluginDefs.getParts().map((part) => part.full_name).join('\n');
-exports.getParts = () => defs.parts.map((part) => part.full_name);
+export const getParts = () => pluginDefs.getParts().map((part) => part.full_name);
-const sortHooks = (hookSetName, hooks) => {
+const sortHooks = (hookSetName: string, hooks: Map<string, Map<string,Map<string, string>>>) => {
-  for (const [pluginName, def] of Object.entries(defs.plugins)) {
+  for (const [pluginName, def] of Object.entries(pluginDefs.getPlugins())) {
    for (const part of def.parts) {
      for (const [hookName, hookFnName] of Object.entries(part[hookSetName] || {})) {
        let hookEntry = hooks.get(hookName);
        if (!hookEntry) {
-          hookEntry = new Map();
+          hookEntry = new Map<string,Map<string, string>>();
          hooks.set(hookName, hookEntry);
        }
        let pluginEntry = hookEntry.get(pluginName);
        if (!pluginEntry) {
-          pluginEntry = new Map();
+          pluginEntry = new Map<string, string>();
          hookEntry.set(pluginName, pluginEntry);
        }
-        pluginEntry.set(part.name, hookFnName);
+        pluginEntry.set(part.name, hookFnName as string);
      }
    }
  }
 };
-exports.getHooks = (hookSetName) => {
+export const getHooks = (hookSetName: string) => {
  const hooks = new Map();
  sortHooks(hookSetName, hooks);
  return hooks;
 };
-exports.formatHooks = (hookSetName, html) => {
+export const formatHooks = (hookSetName: string, html: string|false) => {
-  let hooks = new Map();
+  let hooks:Map<string, Map<string,Map<string, string>>> = new Map();
  sortHooks(hookSetName, hooks);
  const lines = [];
-  const sortStringKeys = (a, b) => String(a[0]).localeCompare(b[0]);
+  const sortStringKeys = (a: [string, Map<string, Map<string, string>>]| [string, Map<string, string>]|[string,string], b: [string, Map<string, Map<string, string>>]|[string,string]| [string, Map<string, string>]) => String(a[0]).localeCompare(b[0]);
  if (html) lines.push('<dl>');
  hooks = new Map([...hooks].sort(sortStringKeys));
  for (const [hookName, hookEntry] of hooks) {
@ -88,20 +92,20 @@ exports.formatHooks = (hookSetName, html) => {
  return lines.join('\n');
 };
-exports.pathNormalization = (part, hookFnName, hookName) => {
+export const pathNormalization = (part: Part, hookFnName: string, hookName: string) => {
  const tmp = hookFnName.split(':'); // hookFnName might be something like 'C:\\foo.js:myFunc'.
  // If there is a single colon assume it's 'filename:funcname' not 'C:\\filename'.
  const functionName = (tmp.length > 1 ? tmp.pop() : null) || hookName;
  const moduleName = tmp.join(':') || part.plugin;
-  const packageDir = path.dirname(defs.plugins[part.plugin].package.path);
+  const packageDir = path.dirname(pluginDefs.getPlugins()[part.plugin!].package.path);
-  const fileName = path.join(packageDir, moduleName);
+  const fileName = path.join(packageDir, moduleName!);
  return `${fileName}:${functionName}`;
 };
-exports.update = async () => {
+export const update = async () => {
-  const packages = await exports.getPackages();
+  const packages = await getPackages();
-  const parts = {}; // Key is full name. sortParts converts this into a topologically sorted array.
+  const parts: MapArrayType<Part> = {}; // Key is full name. sortParts converts this into a topologically sorted array.
-  const plugins = {};
+  const plugins:  MapArrayType<any> = {};
  // Load plugin metadata ep.json
  await Promise.all(Object.keys(packages).map(async (pluginName) => {
@ -110,23 +114,27 @@ exports.update = async () => {
  }));
  logger.info(`Loaded ${Object.keys(packages).length} plugins`);
-  defs.plugins = plugins;
+  pluginDefs.setPlugins(plugins);
-  defs.parts = sortParts(parts);
+  pluginDefs.setParts(sortParts(parts));
-  defs.hooks = pluginUtils.extractHooks(defs.parts, 'hooks', exports.pathNormalization);
+  pluginDefs.setHooks(pluginUtils.extractHooks(pluginDefs.getParts(), 'hooks', pathNormalization))
-  defs.loaded = true;
+  pluginDefs.setLoaded(true);
-  await Promise.all(Object.keys(defs.plugins).map(async (p) => {
+
  await Promise.all(Object.keys(pluginDefs.getPlugins()).map(async (p) => {
    const logger = log4js.getLogger(`plugin:${p}`);
    await hooks.aCallAll(`init_${p}`, {logger});
  }));
 };
-exports.getPackages = async () => {
+import {linkInstaller} from "./installer";
-  const {linkInstaller} = require("./installer");
+import {MapArrayType} from "../../../node/types/MapType";
 import {IPluginInfoExtended} from "./IPluginInfoExtended";
 export const getPackages = async () => {
  const plugins = await linkInstaller.listPlugins();
-  const newDependencies = {};
+  const newDependencies:MapArrayType<IPluginInfoExtended> = {};
  for (const plugin of plugins) {
-    if (!plugin.name.startsWith(exports.prefix)) {
+    if (!plugin.name.startsWith(prefix)) {
      continue;
    }
    plugin.path = plugin.realPath = plugin.location;
@ -134,17 +142,20 @@ exports.getPackages = async () => {
  }
  newDependencies['ep_etherpad-lite'] = {
    dependencies: {},
    location: "",
    mainFile: "",
    name: 'ep_etherpad-lite',
    version: settings.getEpVersion(),
    path: path.join(settings.root, 'node_modules/ep_etherpad-lite'),
-    realPath: path.join(settings.root, 'src'),
+    realPath: path.join(settings.root, 'src')
  };
  return newDependencies;
 };
-const loadPlugin = async (packages, pluginName, plugins, parts) => {
+const loadPlugin = async (packages:  MapArrayType<IPluginInfoExtended>, pluginName: string, plugins:  MapArrayType<any>, parts: MapArrayType<Part>) => {
-  const pluginPath = path.resolve(packages[pluginName].path, 'ep.json');
+  const pluginPath = path.resolve(packages[pluginName].path!, 'ep.json');
  try {
    const data = await fs.readFile(pluginPath);
    try {
@ -156,16 +167,16 @@ const loadPlugin = async (packages, pluginName, plugins, parts) => {
        part.full_name = `${pluginName}/${part.name}`;
        parts[part.full_name] = part;
      }
-    } catch (err) {
+    } catch (err: any) {
      logger.error(`Unable to parse plugin definition file ${pluginPath}: ${err.stack || err}`);
    }
-  } catch (err) {
+  } catch (err: any) {
    logger.error(`Unable to load plugin definition file ${pluginPath}: ${err.stack || err}`);
  }
 };
-const partsToParentChildList = (parts) => {
+const partsToParentChildList = (parts: MapArrayType<Part>) => {
-  const res = [];
+  const res:[string,string][] = [];
  for (const name of Object.keys(parts)) {
    for (const childName of parts[name].post || []) {
      res.push([name, childName]);
@ -181,6 +192,6 @@ const partsToParentChildList = (parts) => {
 };
 // Used only in Node, so no need for _
-const sortParts = (parts) => tsort(partsToParentChildList(parts))
+const sortParts = (parts: MapArrayType<Part>) => new TSort(partsToParentChildList(parts)).getSorted()
-    .filter((name) => parts[name] !== undefined)
+  .filter((name) => parts[name] !== undefined)
-    .map((name) => parts[name]);
+  .map((name) => parts[name]);
--- a/src/static/js/pluginfw/shared.ts
+++ b/src/static/js/pluginfw/shared.ts
@ -1,15 +1,16 @@
 'use strict';
-const defs = require('./plugin_defs');
+import {Part, pluginDefs, PluginHook} from './plugin_defs';
 import {MapArrayType} from "../../../node/types/MapType";
-const disabledHookReasons = {
+const disabledHookReasons: MapArrayType<any> = {
  hooks: {
    indexCustomInlineScripts: 'The hook makes it impossible to use a Content Security Policy ' +
        'that prohibits inline code. Permitting inline code makes XSS vulnerabilities more likely',
  },
 };
-const loadFn = (path, hookName, modules) => {
+const loadFn = (path: string, hookName: string, modules: Function) => {
  let functionName;
  const parts = path.split(':');
@ -28,6 +29,7 @@ const loadFn = (path, hookName, modules) => {
  if (modules === undefined || !("get" in modules)) {
    fn = require(/* webpackIgnore: true */ path);
  } else {
    // @ts-ignore
    fn = modules.get(path);
  }
@ -39,9 +41,10 @@ const loadFn = (path, hookName, modules) => {
  return fn;
 };
-const extractHooks = (parts, hookSetName, normalizer, modules) => {
+export const extractHooks = (parts: Part[], hookSetName: string, normalizer: Function|null, modules: Function) => {
-  const hooks = {};
+  const hooks: MapArrayType<PluginHook[]> = {};
  for (const part of parts) {
    // @ts-ignore
    for (const [hookName, regHookFnName] of Object.entries(part[hookSetName] || {})) {
      /* On the server side, you can't just
       * require("pluginname/whatever") if the plugin is installed as
@ -64,7 +67,8 @@ const extractHooks = (parts, hookSetName, normalizer, modules) => {
      } catch (err) {
        console.error(`Failed to load hook function "${hookFnName}" for plugin "${part.plugin}" ` +
                      `part "${part.name}" hook set "${hookSetName}" hook "${hookName}": ` +
-                      `${err.stack || err}`);
+          // @ts-ignore
          `${err.stack || err}`);
      }
      if (hookFn) {
        if (hooks[hookName] == null) hooks[hookName] = [];
@ -80,7 +84,6 @@ const extractHooks = (parts, hookSetName, normalizer, modules) => {
  return hooks;
 };
 exports.extractHooks = extractHooks;
 /*
 * Returns an array containing the names of the installed client-side plugins
@ -94,8 +97,8 @@ exports.extractHooks = extractHooks;
 *   No plugins:   []
 *   Some plugins: [ 'ep_adminpads', 'ep_add_buttons', 'ep_activepads' ]
 */
-exports.clientPluginNames = () => {
+export const clientPluginNames = () => {
-  const clientPluginNames = defs.parts
+  const clientPluginNames = pluginDefs.getParts()
      .filter((part) => Object.prototype.hasOwnProperty.call(part, 'client_hooks'))
      .map((part) => `plugin-${part.plugin}`);
  return [...new Set(clientPluginNames)];
--- a/src/static/js/pluginfw/tsort.js
+++ b/src/static/js/pluginfw/tsort.js
@ -1,112 +0,0 @@
 'use strict';
 /**
 * general topological sort
 * from https://gist.github.com/1232505
 * @author SHIN Suzuki (shinout310@gmail.com)
 * @param Array<Array> edges : list of edges. each edge forms Array<ID,ID> e.g. [12 , 3]
 *
 * @returns Array : topological sorted list of IDs
 **/
 const tsort = (edges) => {
  const nodes = {}; // hash: stringified id of the node => { id: id, afters: lisf of ids }
  const sorted = []; // sorted list of IDs ( returned value )
  const visited = {}; // hash: id of already visited node => true
  const Node = function (id) {
    this.id = id;
    this.afters = [];
  };
  // 1. build data structures
  edges.forEach((v) => {
    const from = v[0]; const
      to = v[1];
    if (!nodes[from]) nodes[from] = new Node(from);
    if (!nodes[to]) nodes[to] = new Node(to);
    nodes[from].afters.push(to);
  });
  const visit = (idstr, ancestors) => {
    const node = nodes[idstr];
    const id = node.id;
    // if already exists, do nothing
    if (visited[idstr]) return;
    if (!Array.isArray(ancestors)) ancestors = [];
    ancestors.push(id);
    visited[idstr] = true;
    node.afters.forEach((afterID) => {
      // if already in ancestors, a closed chain exists.
      if (ancestors.indexOf(afterID) >= 0) throw new Error(`closed chain : ${afterID} is in ${id}`);
      visit(afterID.toString(), ancestors.map((v) => v)); // recursive call
    });
    sorted.unshift(id);
  };
  // 2. topological sort
  Object.keys(nodes).forEach(visit);
  return sorted;
 };
 /**
 * TEST
 **/
 const tsortTest = () => {
  // example 1: success
  let edges = [
    [1, 2],
    [1, 3],
    [2, 4],
    [3, 4],
  ];
  let sorted = tsort(edges);
  // example 2: failure ( A > B > C > A )
  edges = [
    ['A', 'B'],
    ['B', 'C'],
    ['C', 'A'],
  ];
  try {
    sorted = tsort(edges);
    console.log('succeeded', sorted);
  } catch (e) {
    console.log(e.message);
  }
  // example 3: generate random edges
  const max = 100;
  const iteration = 30;
  const randomInt = (max) => Math.floor(Math.random() * max) + 1;
  edges = (() => {
    const ret = [];
    let i = 0;
    while (i++ < iteration) ret.push([randomInt(max), randomInt(max)]);
    return ret;
  })();
  try {
    sorted = tsort(edges);
    console.log('succeeded', sorted);
  } catch (e) {
    console.log('failed', e.message);
  }
 };
 // for node.js
 if (typeof exports === 'object' && exports === this) {
  module.exports = tsort;
  if (process.argv[1] === __filename) tsortTest();
 }
--- a/src/static/js/pluginfw/tsort.ts
+++ b/src/static/js/pluginfw/tsort.ts
@ -0,0 +1,74 @@
 'use strict';
 import {MapArrayType} from "../../../node/types/MapType";
 /**
 * general topological sort
 * from https://gist.github.com/1232505
 * @author SHIN Suzuki (shinout310@gmail.com)
 * @param Array<Array> edges : list of edges. each edge forms Array<ID,ID> e.g. [12 , 3]
 *
 * @returns Array : topological sorted list of IDs
 **/
 export class TSort {
  private nodes: MapArrayType<Node> = {}; // hash: stringified id of the node => { id: id, afters: lisf of ids }
  private sorted: (number|string)[] = []; // sorted list of IDs ( returned value )
  private visited: MapArrayType<boolean> = {}; // hash: id of already visited node => true
  constructor(edges: (number|string)[][]) {
    // 1. build data structures
    edges.forEach((v) => {
      const from = v[0]; const
        to = v[1];
      if (!this.nodes[from]) {
        this.nodes[from] = new Node(from);
      }
      if (!this.nodes[to]) {
        this.nodes[to] = new Node(to);
      }
      this.nodes[from].afters.push(to);
    });
    // 2. topological sort
    for (const key in this.nodes) {
      this.visit(key, []);
    }
  }
  visit = (idstr: string, ancestors:(number|string)[]) => {
    const node = this.nodes[idstr];
    const id = node.id;
    // if already exists, do nothing
    if (this.visited[idstr]) return;
    if (!Array.isArray(ancestors)) ancestors = [];
    ancestors.push(id);
    this.visited[idstr] = true;
    node.afters.forEach((afterID) => {
      // if already in ancestors, a closed chain exists.
      if (ancestors.indexOf(afterID) >= 0) throw new Error(`closed chain : ${afterID} is in ${id}`);
      this.visit(afterID.toString(), ancestors.map((v) => v)); // recursive call
    });
    this.sorted.unshift(id);
  }
  getSorted = ()=>{
    return this.sorted
  }
 }
 class Node {
  id: number|string
  afters: (number|string)[]
  constructor(id: number|string) {
    this.id = id
    this.afters = []
  }
 }
--- a/src/static/js/timeslider.ts
+++ b/src/static/js/timeslider.ts
@ -32,8 +32,7 @@ import connect from './socketio'
 import html10n from '../js/vendors/html10n'
 import {Socket} from "socket.io";
 import {ClientVarData, ClientVarMessage, ClientVarPayload, SocketIOMessage} from "./types/SocketIOMessage";
-import {Func} from "mocha";
+import {Revision} from "./broadcast_revisions";
 export type ChangeSetLoader = {
  handleMessageFromServer(msg: ClientVarMessage): void
 }
@ -111,19 +110,20 @@ const sendSocketMsg = (type: string, data: Object) => {
 const fireWhenAllScriptsAreLoaded: Function[] = [];
-const handleClientVars = (message: ClientVarData) => {
+const handleClientVars = async (message: ClientVarData) => {
  // save the client Vars
  window.clientVars = message.data;
  if (window.clientVars.sessionRefreshInterval) {
    const ping =
-        () => $.ajax('../../_extendExpressSessionLifetime', {method: 'PUT'}).catch(() => {});
+      () => $.ajax('../../_extendExpressSessionLifetime', {method: 'PUT'}).catch(() => {
      });
    setInterval(ping, window.clientVars.sessionRefreshInterval);
  }
-  if(window.clientVars.mode === "development") {
+  if (window.clientVars.mode === "development") {
    console.warn('Enabling development mode with live update')
-    socket.on('liveupdate', ()=>{
+    socket.on('liveupdate', () => {
      console.log('Doing live reload')
      location.reload()
    })
@ -131,11 +131,11 @@ const handleClientVars = (message: ClientVarData) => {
  // load all script that doesn't work without the clientVars
  BroadcastSlider = require('./broadcast_slider')
-      .loadBroadcastSliderJS(fireWhenAllScriptsAreLoaded);
+    .loadBroadcastSliderJS(fireWhenAllScriptsAreLoaded);
-  require('./broadcast_revisions').loadBroadcastRevisionsJS();
+  await import('./broadcast_revisions')
  changesetLoader = require('./broadcast')
-      .loadBroadcastJS(socket, sendSocketMsg, fireWhenAllScriptsAreLoaded, BroadcastSlider);
+    .loadBroadcastJS(socket, sendSocketMsg, fireWhenAllScriptsAreLoaded, BroadcastSlider);
  // initialize export ui
  require('./pad_impexp').padimpexp.init();
--- a/src/static/js/types/PadRevision.ts
+++ b/src/static/js/types/PadRevision.ts
@ -0,0 +1,7 @@
 export type PadRevision = {
  revNum: number;
  savedById: string;
  label: string;
  timestamp: number;
  id: string;
 }
--- a/src/static/js/types/SocketIOMessage.ts
+++ b/src/static/js/types/SocketIOMessage.ts
@ -2,6 +2,9 @@ import {MapArrayType} from "../../../node/types/MapType";
 import {AText} from "./AText";
 import AttributePool from "../AttributePool";
 import attributePool from "../AttributePool";
 import ChatMessage from "../ChatMessage";
 import {PadRevision} from "./PadRevision";
 import {MappedPlugin} from "../pluginfw/plugin_defs";
 export type SocketIOMessage = {
  type: string
@ -11,16 +14,25 @@ export type SocketIOMessage = {
 export type HistoricalAuthorData = MapArrayType<{
  name: string;
  colorId: number;
-  userId: string
+  userId?: string
 }>
 export type ServerVar = {
  rev: number
-  historicalAuthorData: HistoricalAuthorData,
+  clientIp: string
-  initialAttributedText: string,
+  padId: string
-  apool: AttributePool
+  historicalAuthorData?: HistoricalAuthorData,
  initialAttributedText: {
    attribs: string
    text: string
  },
  apool: AttributePoolWire
  time: number
 }
 export type AttributePoolWire = {numToAttrib: {[p: number]: [string, string]}, nextNum: number}
 export type UserInfo = {
  userId: string
  colorId: number,
@ -31,18 +43,18 @@ export type ClientVarPayload = {
  readOnlyId: string
  automaticReconnectionTimeout: number
  sessionRefreshInterval: number,
-  historicalAuthorData: HistoricalAuthorData,
+  atext?: AText,
-  atext: AText,
+  apool?: AttributePool,
-  apool: AttributePool,
+  userName?: string,
  noColors: boolean,
  userName: string,
  userColor: number,
-  hideChat: boolean,
+  hideChat?: boolean,
  padOptions: PadOption,
  padId: string,
  clientIp: string,
-  colorPalette: MapArrayType<number>,
+  colorPalette: string[],
-  accountPrivs: MapArrayType<string>,
+  accountPrivs: {
    maxRevisions: number,
  },
  collab_client_vars: ServerVar,
  chatHead: number,
  readonly: boolean,
@ -54,6 +66,29 @@ export type ClientVarPayload = {
  skinName: string
  skinVariants: string,
  exportAvailable: string
  savedRevisions: PadRevision[],
  initialRevisionList: number[],
  padShortcutEnabled: MapArrayType<boolean>,
  initialTitle: string,
  opts: {}
  numConnectedUsers: number
  abiwordAvailable: string
  sofficeAvailable: string
  plugins: {
    plugins:  MapArrayType<any>
    parts:  MappedPlugin[]
  }
  indentationOnNewLine: boolean
  scrollWhenFocusLineIsOutOfViewport : {
    percentage: {
      editionAboveViewport: number,
      editionBelowViewport: number
    }
    duration: number
    scrollWhenCaretIsInTheLastLineOfViewport: boolean
    percentageToScrollWhenUserPressesArrowUp: number
  }
  initialChangesets: []
 }
 export type ClientVarData = {
@ -105,7 +140,9 @@ export type ClientMessageMessage = {
 export type ChatMessageMessage = {
  type: 'CHAT_MESSAGE'
-  message: string
+  data: {
    message: ChatMessage
  }
 }
 export type ChatMessageMessages = {
@ -122,7 +159,18 @@ export type ClientUserChangesMessage = {
-export type ClientSendMessages =  ClientUserChangesMessage | ClientSendUserInfoUpdate| ClientMessageMessage | GetChatMessageMessage |ClientSuggestUserName | NewRevisionListMessage | RevisionLabel | PadOptionsMessage| ClientSaveRevisionMessage
+export type ClientSendMessages =  ClientUserChangesMessage |ClientReadyMessage| ClientSendUserInfoUpdate|ChatMessageMessage| ClientMessageMessage | GetChatMessageMessage |ClientSuggestUserName | NewRevisionListMessage | RevisionLabel | PadOptionsMessage| ClientSaveRevisionMessage
 export type ClientReadyMessage = {
  type: 'CLIENT_READY',
  component: string,
  padId: string,
  sessionID: string,
  token: string,
  userInfo: UserInfo,
  reconnect?: boolean
  client_rev?: number
 }
 export type ClientSaveRevisionMessage = {
  type: 'SAVE_REVISION'
@ -191,18 +239,44 @@ export type ClientDisconnectedMessage = {
  type: "disconnected"
  disconnected: boolean
 }
 export type UserChanges = {
  data: ClientUserChangesMessage
 }
 export type UserSuggestUserName = {
  data: {
    payload: ClientSuggestUserName
  }
 }
 export type ChangesetRequestMessage = {
  type: 'CHANGESET_REQ'
  data: {
    granularity: number
    start: number
    requestID: string
  }
 }
 export type CollabroomMessage = {
  type: 'COLLABROOM'
  data: ClientSendUserInfoUpdate | ClientUserChangesMessage | ChatMessageMessage | GetChatMessageMessage | ClientSaveRevisionMessage | ClientMessageMessage
 }
 export type ClientVarMessage = {
-  type: 'CHANGESET_REQ'| 'COLLABROOM'| 'CUSTOM'
+  type:  'CUSTOM'
-  data:
+  data: ClientVarData
-    | ClientNewChanges
+} | ClientVarData | ClientDisconnectedMessage | ClientReadyMessage| ChangesetRequestMessage | CollabroomMessage
-    | ClientAcceptCommitMessage
+
-    |UserNewInfoMessage
+export type ClientCustomMessage = {
-    | UserLeaveMessage
+  type: 'CUSTOM',
-    |ClientMessageMessage
+  action: string,
-    |ChatMessageMessage
+  payload: any
-    |ChatMessageMessages
+
-  |ClientConnectMessage,
+}
 } | ClientVarData | ClientDisconnectedMessage
 export type SocketClientReadyMessage = {
  type: string
--- a/src/static/js/types/Window.ts
+++ b/src/static/js/types/Window.ts
@ -1,5 +1,6 @@
 import {ClientVarData, ClientVarPayload} from "./SocketIOMessage";
 import {Pad} from "../pad";
 import {Revision} from "../broadcast_revisions";
 declare global {
  interface Window {
@ -7,6 +8,7 @@ declare global {
    $: any,
    customStart?:any,
    ajlog: string
    revisionInfo: Record<number|string, number|Revision>
  }
  let pad: Pad
 }
--- a/src/tests/backend/specs/tsort.spec.ts
+++ b/src/tests/backend/specs/tsort.spec.ts
@ -0,0 +1,74 @@
 import {describe, it} from 'vitest'
 import {TSort} from "../../../static/js/pluginfw/tsort";
 import {expect} from "@playwright/test";
 describe('tsort', () => {
  it('should work', () => {
    let edges: (number|string)[][] = [
      [1, 2],
      [1, 3],
      [2, 4],
      [3, 4],
    ];
    let sorted = new TSort(edges).getSorted();
    expect(sorted).toEqual([1, 3, 2, 4]);
    // example 3: generate random edges
    const max = 100;
    const iteration = 30;
    const randomInt = (max: number) => Math.floor(Math.random() * max) + 1;
    edges = (() => {
      const ret = [];
      let i = 0;
      while (i++ < iteration) ret.push([randomInt(max), randomInt(max)]);
      return ret;
    })();
    try {
      sorted = new TSort(edges).getSorted();
      console.log('succeeded', sorted);
    } catch (e) {
      // @ts-ignore
      console.log('failed', e.message);
    }
  })
  it('fails with closed chain', ()=> {
    // example 2: failure ( A > B > C > A )
    let edges = [
      ['A', 'B'],
      ['B', 'C'],
      ['C', 'A'],
    ];
    expect(() => new TSort(edges)).toThrowError('closed chain : A is in C');
  })
  it('fails with closed chain 2', ()=> {
    // example 1: failure ( 1 > 2 > 3 > 1 )
    let edges = [
      [1, 2],
      [2, 3],
      [3, 1],
    ];
    expect(() => new TSort(edges)).toThrowError('closed chain : 1 is in 3');
  })
  it('works with 6 nodes', ()=> {
    let edges = [
      [1, 2],
      [1, 3],
      [2, 4],
      [3, 4],
      [4, 5],
      [4, 6],
    ];
    let sorted = new TSort(edges).getSorted();
    expect(sorted).toEqual([1, 3, 2, 4, 6, 5]);
  })
 })