src/vs/platform/update/electron-main/updateService.darwin.ts/DarwinUpdateService/onRawUpdateAvailable
class DarwinUpdateService:	@memoize private get onRawUpdateAvailable(): Event<IUpdate> { return Event.fromNodeEventEmitter(electron.autoUpdater, 'update-available', (_, url, version) => ({ url, version, productVersion: version })); }