Emit an event when the set of available extensions has changed

src/vs/workbench/services/commands/test/common/commandService.test.ts

@@ -19,6 +19,7 @@ class SimpleExtensionService implements IExtensionService {
 		return this._onDidRegisterExtensions.event;
 	}
 	onDidChangeExtensionsStatus = null!;
+	onDidChangeExtensions = null!;
 	onWillActivateByEvent = null!;
 	onDidChangeResponsiveChange = null!;
 	activateByEvent(activationEvent: string): Promise<void> {

src/vs/workbench/services/extensions/common/extensions.ts

@@ -143,6 +143,11 @@ export interface IExtensionService extends ICpuProfilerTarget {
 	 */
 	onDidChangeExtensionsStatus: Event<ExtensionIdentifier[]>;
 
+	/**
+	 * Fired when the available extensions change (i.e. when extensions are added or removed).
+	 */
+	onDidChangeExtensions: Event<void>;
+
 	/**
 	 * An event that is fired when activation happens.
 	 */

src/vs/workbench/services/extensions/electron-browser/extensionService.ts

@@ -75,6 +75,9 @@ export class ExtensionService extends Disposable implements IExtensionService {
 	private readonly _onDidChangeExtensionsStatus: Emitter<ExtensionIdentifier[]> = this._register(new Emitter<ExtensionIdentifier[]>());
 	public readonly onDidChangeExtensionsStatus: Event<ExtensionIdentifier[]> = this._onDidChangeExtensionsStatus.event;
 
+	private readonly _onDidChangeExtensions: Emitter<void> = this._register(new Emitter<void>());
+	public readonly onDidChangeExtensions: Event<void> = this._onDidChangeExtensions.event;
+
 	private readonly _onWillActivateByEvent = this._register(new Emitter<IWillActivateEvent>());
 	public readonly onWillActivateByEvent: Event<IWillActivateEvent> = this._onWillActivateByEvent.event;
 
@@ -226,6 +229,8 @@ export class ExtensionService extends Disposable implements IExtensionService {
 			await this._extensionHostProcessManagers[0].deltaExtensions(toAdd, toRemove.map(e => e.identifier));
 		}
 
+		this._onDidChangeExtensions.fire(undefined);
+
 		for (let i = 0; i < toAdd.length; i++) {
 			this._activateAddedExtensionIfNeeded(toAdd[i]);
 		}

src/vs/workbench/test/workbenchTestServices.ts

@@ -310,6 +310,7 @@ export class TestExtensionService implements IExtensionService {
 	_serviceBrand: any;
 	onDidRegisterExtensions: Event<void> = Event.None;
 	onDidChangeExtensionsStatus: Event<ExtensionIdentifier[]> = Event.None;
+	onDidChangeExtensions: Event<void> = Event.None;
 	onWillActivateByEvent: Event<IWillActivateEvent> = Event.None;
 	onDidChangeResponsiveChange: Event<IResponsiveStateChangeEvent> = Event.None;
 	activateByEvent(_activationEvent: string): Promise<void> { return Promise.resolve(undefined); }