fix: make sure classes in lib correctly implement Electron interfaces (#40291)

lib/browser/api/auto-updater/auto-updater-win.ts

@@ -2,7 +2,7 @@ import { app } from 'electron/main';
 import { EventEmitter } from 'events';
 import * as squirrelUpdate from '@electron/internal/browser/api/auto-updater/squirrel-update-win';
 
-class AutoUpdater extends EventEmitter {
+class AutoUpdater extends EventEmitter implements Electron.AutoUpdater {
   updateAvailable: boolean = false;
   updateURL: string | null = null;
 
@@ -15,7 +15,7 @@ class AutoUpdater extends EventEmitter {
   }
 
   getFeedURL () {
-    return this.updateURL;
+    return this.updateURL ?? '';
   }
 
   setFeedURL (options: { url: string } | string) {

lib/browser/api/crash-reporter.ts

@@ -3,7 +3,7 @@ import * as deprecate from '@electron/internal/common/deprecate';
 
 const binding = process._linkedBinding('electron_browser_crash_reporter');
 
-class CrashReporter {
+class CrashReporter implements Electron.CrashReporter {
   start (options: Electron.CrashReporterStartOptions) {
     const {
       productName = app.name,

lib/browser/api/message-channel.ts

@@ -1,10 +1,12 @@
 import { MessagePortMain } from '@electron/internal/browser/message-port-main';
+import { EventEmitter } from 'events';
 const { createPair } = process._linkedBinding('electron_browser_message_port');
 
-export default class MessageChannelMain {
+export default class MessageChannelMain extends EventEmitter implements Electron.MessageChannelMain {
   port1: MessagePortMain;
   port2: MessagePortMain;
   constructor () {
+    super();
     const { port1, port2 } = createPair();
     this.port1 = new MessagePortMain(port1);
     this.port2 = new MessagePortMain(port2);

lib/browser/api/power-monitor.ts

@@ -8,7 +8,7 @@ const {
   isOnBatteryPower
 } = process._linkedBinding('electron_browser_power_monitor');
 
-class PowerMonitor extends EventEmitter {
+class PowerMonitor extends EventEmitter implements Electron.PowerMonitor {
   constructor () {
     super();
     // Don't start the event source until both a) the app is ready and b)

lib/browser/api/share-menu.ts

@@ -1,9 +1,11 @@
 import { BrowserWindow, Menu, SharingItem, PopupOptions } from 'electron/main';
+import { EventEmitter } from 'events';
 
-class ShareMenu {
+class ShareMenu extends EventEmitter implements Electron.ShareMenu {
   private menu: Menu;
 
   constructor (sharingItem: SharingItem) {
+    super();
     this.menu = new (Menu as any)({ sharingItem });
   }
 

lib/browser/api/utility-process.ts

@@ -4,7 +4,7 @@ import { Socket } from 'net';
 import { MessagePortMain } from '@electron/internal/browser/message-port-main';
 const { _fork } = process._linkedBinding('electron_browser_utility_process');
 
-class ForkUtilityProcess extends EventEmitter {
+class ForkUtilityProcess extends EventEmitter implements Electron.UtilityProcess {
   #handle: ElectronInternal.UtilityProcessWrapper | null;
   #stdout: Duplex | null = null;
   #stderr: Duplex | null = null;