src/vs/platform/files/node/diskFileSystemProviderServer.ts/AbstractDiskFileSystemProviderChannel/watch
class AbstractDiskFileSystemProviderChannel:	private async watch(uriTransformer: IURITransformer, sessionId: string, req: number, _resource: UriComponents, opts: IWatchOptions): Promise<void> {
		const watcher = this.sessionToWatcher.get(sessionId);
		if (watcher) {
			const resource = this.transformIncoming(uriTransformer, _resource);
			const disposable = watcher.watch(req, resource, opts);
			this.watchRequests.set(sessionId + req, disposable);
		}
	}