ESM: Rewritten src/web/ in ESM format.

src/web/SeasonalWaiter.mjs

@@ -0,0 +1,56 @@
+/**
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ */
+
+/**
+ * Waiter to handle seasonal events and easter eggs.
+ */
+class SeasonalWaiter {
+
+    /**
+     * SeasonalWaiter contructor.
+     *
+     * @param {App} app - The main view object for CyberChef.
+     * @param {Manager} manager - The CyberChef event manager.
+     */
+    constructor(app, manager) {
+        this.app = app;
+        this.manager = manager;
+    }
+
+
+    /**
+     * Loads all relevant items depending on the current date.
+     */
+    load() {
+        // Konami code
+        this.kkeys = [];
+        window.addEventListener("keydown", this.konamiCodeListener.bind(this));
+    }
+
+
+    /**
+     * Listen for the Konami code sequence of keys. Turn the page upside down if they are all heard in
+     * sequence.
+     * #konamicode
+     */
+    konamiCodeListener(e) {
+        this.kkeys.push(e.keyCode);
+        const konami = [38, 38, 40, 40, 37, 39, 37, 39, 66, 65];
+        for (let i = 0; i < this.kkeys.length; i++) {
+            if (this.kkeys[i] !== konami[i]) {
+                this.kkeys = [];
+                break;
+            }
+            if (i === konami.length - 1) {
+                $("body").children().toggleClass("konami");
+                this.kkeys = [];
+            }
+        }
+    }
+
+}
+
+export default SeasonalWaiter;