feat(rsa-key-pair-generator): refresh certs button

src/composable/computedRefreshable.ts

@@ -0,0 +1,42 @@
+import { computedAsync } from '@vueuse/core';
+import { computed, ref, watch } from 'vue';
+
+export { computedRefreshable, computedRefreshableAsync };
+
+function computedRefreshable<T>(getter: () => T) {
+  const dirty = ref(true);
+  let value: T;
+
+  const update = () => (dirty.value = true);
+
+  watch(getter, update);
+
+  const computedValue = computed(() => {
+    if (dirty.value) {
+      value = getter();
+      dirty.value = false;
+    }
+    return value;
+  });
+
+  return [computedValue, update] as const;
+}
+
+function computedRefreshableAsync<T>(getter: () => Promise<T>, defaultValue?: T) {
+  const dirty = ref(true);
+  let value: T;
+
+  const update = () => (dirty.value = true);
+
+  watch(getter, update);
+
+  const computedValue = computedAsync(async () => {
+    if (dirty.value) {
+      value = await getter();
+      dirty.value = false;
+    }
+    return value;
+  }, defaultValue);
+
+  return [computedValue, update] as const;
+}