src/vs/server/node/remoteFileSystemProviderServer.ts/SessionFileWatcher/getRecursiveWatcherOptions
class SessionFileWatcher:	protected override getRecursiveWatcherOptions(environmentService: IServerEnvironmentService): IRecursiveWatcherOptions | undefined {
		const fileWatcherPolling = environmentService.args['file-watcher-polling'];
		if (fileWatcherPolling) {
			const segments = fileWatcherPolling.split(delimiter);
			const pollingInterval = Number(segments[0]);
			if (pollingInterval > 0) {
				const usePolling = segments.length > 1 ? segments.slice(1) : true;
				return { usePolling, pollingInterval };
			}
		}

		return undefined;
	}