feat: remove on(ready) requirement from powerMonitor (#37937)

lib/browser/api/power-monitor.ts

@@ -1,5 +1,4 @@
 import { EventEmitter } from 'events';
-import { app } from 'electron/main';
 
 const {
   createPowerMonitor,
@@ -14,7 +13,6 @@ class PowerMonitor extends EventEmitter {
     // Don't start the event source until both a) the app is ready and b)
     // there's a listener registered for a powerMonitor event.
     this.once('newListener', () => {
-      app.whenReady().then(() => {
       const pm = createPowerMonitor();
       pm.emit = this.emit.bind(this);
 
@@ -36,7 +34,6 @@ class PowerMonitor extends EventEmitter {
         });
       }
     });
-    });
   }
 
   getSystemIdleState (idleThreshold: number) {

shell/browser/api/electron_api_power_monitor.cc

@@ -91,7 +91,6 @@ void PowerMonitor::SetListeningForShutdown(bool is_listening) {
 
 // static
 v8::Local<v8::Value> PowerMonitor::Create(v8::Isolate* isolate) {
-  CHECK(Browser::Get()->is_ready());
   auto* pm = new PowerMonitor(isolate);
   auto handle = gin::CreateHandle(isolate, pm).ToV8();
   pm->Pin(isolate);

spec/api-power-monitor-spec.ts

@@ -8,7 +8,7 @@
 // python-dbusmock.
 import { expect } from 'chai';
 import * as dbus from 'dbus-native';
-import { ifdescribe } from './lib/spec-helpers';
+import { ifdescribe, startRemoteControlApp } from './lib/spec-helpers';
 import { promisify } from 'util';
 import { setTimeout } from 'timers/promises';
 
@@ -135,6 +135,11 @@ describe('powerMonitor', () => {
     });
   });
 
+  it('is usable before app ready', async () => {
+    const remoteApp = await startRemoteControlApp(['--boot-eval=globalThis.initialValue=require("electron").powerMonitor.getSystemIdleTime()']);
+    expect(await remoteApp.remoteEval('globalThis.initialValue')).to.be.a('number');
+  });
+
   describe('when powerMonitor module is loaded', () => {
     // eslint-disable-next-line no-undef
     let powerMonitor: typeof Electron.powerMonitor;