Rename files

ts/textsecure/EventTarget.std.ts

@@ -0,0 +1,88 @@
+// Copyright 2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable guard-for-in */
+/* eslint-disable no-restricted-syntax */
+
+/*
+ * Implements EventTarget
+ * https://developer.mozilla.org/en-US/docs/Web/API/EventTarget
+ */
+
+export type EventHandler = (event: any) => unknown;
+
+export default class EventTarget {
+  listeners?: { [type: string]: Array<EventHandler> };
+
+  dispatchEvent(ev: Event): Array<unknown> {
+    if (!(ev instanceof Event)) {
+      throw new Error('Expects an event');
+    }
+    if (this.listeners == null || typeof this.listeners !== 'object') {
+      this.listeners = {};
+    }
+    const listeners = this.listeners[ev.type];
+    const results = [];
+    if (typeof listeners === 'object') {
+      const max = listeners.length;
+      for (let i = 0; i < max; i += 1) {
+        const listener = listeners[i];
+        if (typeof listener === 'function') {
+          results.push(listener.call(null, ev));
+        }
+      }
+    }
+    return results;
+  }
+
+  addEventListener(eventName: string, callback: EventHandler): void {
+    if (typeof eventName !== 'string') {
+      throw new Error('First argument expects a string');
+    }
+    if (typeof callback !== 'function') {
+      throw new Error('Second argument expects a function');
+    }
+    if (this.listeners == null || typeof this.listeners !== 'object') {
+      this.listeners = {};
+    }
+    let listeners = this.listeners[eventName];
+    if (typeof listeners !== 'object') {
+      listeners = [];
+    }
+    listeners.push(callback);
+    this.listeners[eventName] = listeners;
+  }
+
+  removeEventListener(eventName: string, callback: EventHandler): void {
+    if (typeof eventName !== 'string') {
+      throw new Error('First argument expects a string');
+    }
+    if (typeof callback !== 'function') {
+      throw new Error('Second argument expects a function');
+    }
+    if (this.listeners == null || typeof this.listeners !== 'object') {
+      this.listeners = {};
+    }
+    const listeners = this.listeners[eventName];
+    if (typeof listeners === 'object') {
+      for (let i = 0; i < listeners.length; i += 1) {
+        if (listeners[i] === callback) {
+          listeners.splice(i, 1);
+          return;
+        }
+      }
+    }
+    this.listeners[eventName] = listeners;
+  }
+
+  extend(source: any): any {
+    const target = this as any;
+
+    for (const prop in source) {
+      target[prop] = source[prop];
+    }
+    return target;
+  }
+}