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