dispose event (microsoft#235267)

related to microsoft#214234

src/vs/platform/update/common/updateIpc.ts

@@ -4,6 +4,7 @@
  *--------------------------------------------------------------------------------------------*/
 
 import { Emitter, Event } from '../../../base/common/event.js';
+import { DisposableStore } from '../../../base/common/lifecycle.js';
 import { IChannel, IServerChannel } from '../../../base/parts/ipc/common/ipc.js';
 import { IUpdateService, State } from './update.js';
 
@@ -37,6 +38,7 @@ export class UpdateChannel implements IServerChannel {
 export class UpdateChannelClient implements IUpdateService {
 
 	declare readonly _serviceBrand: undefined;
+	private readonly disposables = new DisposableStore();
 
 	private readonly _onStateChange = new Emitter<State>();
 	readonly onStateChange: Event<State> = this._onStateChange.event;
@@ -49,7 +51,7 @@ export class UpdateChannelClient implements IUpdateService {
 	}
 
 	constructor(private readonly channel: IChannel) {
-		this.channel.listen<State>('onStateChange')(state => this.state = state);
+		this.disposables.add(this.channel.listen<State>('onStateChange')(state => this.state = state));
 		this.channel.call<State>('_getInitialState').then(state => this.state = state);
 	}
 
@@ -76,4 +78,8 @@ export class UpdateChannelClient implements IUpdateService {
 	_applySpecificUpdate(packagePath: string): Promise<void> {
 		return this.channel.call('_applySpecificUpdate', packagePath);
 	}
+
+	dispose(): void {
+		this.disposables.dispose();
+	}
 }