src/vs/workbench/contrib/notebook/browser/services/notebookWorkerServiceImpl.ts/NotebookWorkerClient/_getOrCreateWorker
class NotebookWorkerClient:	private _getOrCreateWorker(): IWorkerClient<NotebookEditorSimpleWorker> {
		if (!this._worker) {
			try {
				this._worker = this._register(new SimpleWorkerClient<NotebookEditorSimpleWorker, NotebookWorkerHost>(
					this._workerFactory,
					'vs/workbench/contrib/notebook/common/services/notebookSimpleWorker',
					new NotebookWorkerHost(this)
				));
			} catch (err) {
				// logOnceWebWorkerWarning(err);
				// this._worker = new SynchronousWorkerClient(new EditorSimpleWorker(new EditorWorkerHost(this), null));
				throw (err);
			}
		}
		return this._worker;
	}