zipfile.on('entry', (entry: Entry) => {

			if (token.isCancellationRequested) {
				return;
			}

			if (!options.sourcePathRegex.test(entry.fileName)) {
				readNextEntry(token);
				return;
			}

			const fileName = entry.fileName.replace(options.sourcePathRegex, '');

			// directory file names end with '/'
			if (/\/$/.test(fileName)) {
				const targetFileName = path.join(targetPath, fileName);
				last = createCancelablePromise(token => mkdirp(targetFileName, undefined, token).then(() => readNextEntry(token)).then(undefined, e));
				return;
			}

			const stream = ninvoke(zipfile, zipfile.openReadStream, entry);
			const mode = modeFromEntry(entry);

			last = createCancelablePromise(token => throttler.queue(() => stream.then(stream => extractEntry(stream, fileName, mode, targetPath, options, token).then(() => readNextEntry(token)))).then(null!, e));
		});

	test('cancelablePromise - get inner result', async function () {
		let promise = async.createCancelablePromise(token => {
			return async.timeout(12).then(_ => 1234);
		});

		let result = await promise;
		assert.equal(result, 1234);
	});

function extractZip(zipfile: ZipFile, targetPath: string, options: IOptions, logService: ILogService, token: CancellationToken): Promise<void> {
	let last = createCancelablePromise(() => Promise.resolve(null));
	let extractedEntriesCount = 0;

	once(token.onCancellationRequested)(() => {
		logService.debug(targetPath, 'Cancelled.');
		last.cancel();
		zipfile.close();
	});

	return new Promise((c, e) => {
		const throttler = new SimpleThrottler();

		const readNextEntry = (token: CancellationToken) => {
			if (token.isCancellationRequested) {
				return;
			}

			extractedEntriesCount++;
			zipfile.readEntry();
		};

		zipfile.once('error', e);
		zipfile.once('close', () => last.then(() => {
			if (token.isCancellationRequested || zipfile.entryCount === extractedEntriesCount) {
				c(null);
			} else {
				e(new ExtractError('Incomplete', new Error(nls.localize('incompleteExtract', "Incomplete. Found {0} of {1} entries", extractedEntriesCount, zipfile.entryCount))));
			}
		}, e));
		zipfile.readEntry();
		zipfile.on('entry', (entry: Entry) => {

			if (token.isCancellationRequested) {
				return;
			}

			if (!options.sourcePathRegex.test(entry.fileName)) {
				readNextEntry(token);
				return;
			}

			const fileName = entry.fileName.replace(options.sourcePathRegex, '');

			// directory file names end with '/'
			if (/\/$/.test(fileName)) {
				const targetFileName = path.join(targetPath, fileName);
				last = createCancelablePromise(token => mkdirp(targetFileName, void 0, token).then(() => readNextEntry(token)).then(null, e));
				return;
			}

			const stream = ninvoke(zipfile, zipfile.openReadStream, entry);
			const mode = modeFromEntry(entry);

			last = createCancelablePromise(token => throttler.queue(() => stream.then(stream => extractEntry(stream, fileName, mode, targetPath, options, token).then(() => readNextEntry(token)))).then(null, e));
		});
	});
}

	test('extract should handle directories', () => {
		const fixture = path.join(fixtures, 'extract.zip');
		const target = path.join(os.tmpdir(), generateUuid());

		return createCancelablePromise(token => extract(fixture, target, {}, token)
			.then(() => exists(path.join(target, 'extension')))
			.then(exists => assert(exists))
			.then(() => rimraf(target)));
	});

	private _triggerAsyncComputation(): void {
		this._state = ComputeHoverOperationState.SECOND_WAIT;
		this._secondWaitScheduler.schedule(this._secondWaitTime());

		if (this._computer.computeAsync) {
			this._asyncComputationPromiseDone = false;
			this._asyncComputationPromise = createCancelablePromise(token => this._computer.computeAsync!(token));
			this._asyncComputationPromise.then((asyncResult: Result) => {
				this._asyncComputationPromiseDone = true;
				this._withAsyncResult(asyncResult);
			}, (e) => this._onError(e));

		} else {
			this._asyncComputationPromiseDone = true;
		}
	}

		const cache = new Cache(() => {
			counter1++;
			return createCancelablePromise(token => wireCancellationToken(token, TPromise.timeout(1).then(() => counter2++)));
		});