Update power-monitor module

Author: miniak

github-electron/github-electron-main-tests.ts

@@ -478,6 +478,15 @@ app.on('ready', () => {
 	powerMonitor.on('suspend', () => {
 		console.log('The system is going to sleep');
 	});
+	powerMonitor.on('resume', () => {
+		console.log('The system has resumed from sleep');
+	});
+	powerMonitor.on('on-ac', () => {
+		console.log('The system changed to AC power')
+	});
+	powerMonitor.on('on-battery', () => {
+		console.log('The system changed to battery power');
+	});
 });
 
 // protocol

github-electron/github-electron.power-monitor.d.ts

@@ -6,7 +6,27 @@
 /// <reference path="../node/node.d.ts" />
 
 declare namespace Electron {
-
+	/**
+	 * The power-monitor module is used to monitor power state changes.
+	 * You should not use this module until the ready event of the app module is emitted.
+	 */
 	interface PowerMonitor extends NodeJS.EventEmitter {
-    }
+		/**
+		 * Emitted when the system is suspending.
+		 */
+		on(event: 'suspend', listener: Function): this;
+		/**
+		 * Emitted when system is resuming.
+		 */
+		on(event: 'resume', listener: Function): this;
+		/**
+		 * Emitted when the system changes to AC power.
+		 */
+		on(event: 'on-ac', listener: Function): this;
+		/**
+		 * Emitted when system changes to battery power.
+		 */
+		on(event: 'on-battery', listener: Function): this;
+		on(event: string, listener: Function): this;
+	}
 }