src/vs/workbench/services/ipc/electron-sandbox/sharedProcessService.ts/SharedProcessService/connect
class SharedProcessService:	private async connect(): Promise<MessagePortClient> {
		this.logService.trace('Renderer->SharedProcess#connect');

		// Our performance tests show that a connection to the shared
		// process can have significant overhead to the startup time
		// of the window because the shared process could be created
		// as a result. As such, make sure we await the `Restored`
		// phase before making a connection attempt, but also add a
		// timeout to be safe against possible deadlocks.
		// TODO@sandbox revisit this when the shared process connection
		// is more cruicial.
		await Promise.race([this.lifecycleService.when(LifecyclePhase.Restored), timeout(2000)]);

		mark('code/willConnectSharedProcess');

		// Ask to create message channel inside the window
		// and send over a UUID to correlate the response
		const nonce = generateUuid();
		ipcMessagePort.connect('vscode:createSharedProcessMessageChannel', 'vscode:createSharedProcessMessageChannelResult', nonce);

		// Wait until the main side has returned the `MessagePort`
		// We need to filter by the `nonce` to ensure we listen
		// to the right response.
		const onMessageChannelResult = Event.fromDOMEventEmitter<{ nonce: string, port: MessagePort, source: unknown }>(window, 'message', (e: MessageEvent) => ({ nonce: e.data, port: e.ports[0], source: e.source }));
		const { port } = await Event.toPromise(Event.once(Event.filter(onMessageChannelResult, e => e.nonce === nonce && e.source === window)));

		mark('code/didConnectSharedProcess');
		this.logService.trace('Renderer->SharedProcess#connect: connection established');

		return this._register(new MessagePortClient(port, `window:${this.nativeHostService.windowId}`));
	}