return extfs.mkdirp(parentDir).then(() => {
			extfs.writeFileAndFlushSync(storageFile, '');

			let service = new FileStorage(storageFile, () => null);

			service.setItem('some.key', 'some.value');
			assert.equal(service.getItem('some.key'), 'some.value');

			service.removeItem('some.key');
			assert.equal(service.getItem('some.key', 'some.default'), 'some.default');

			assert.ok(!service.getItem('some.unknonw.key'));

			service.setItem('some.other.key', 'some.other.value');

			service = new FileStorage(storageFile, () => null);

			assert.equal(service.getItem('some.other.key'), 'some.other.value');

			service.setItem('some.other.key', 'some.other.value');
			assert.equal(service.getItem('some.other.key'), 'some.other.value');

			service.setItem('some.undefined.key', void 0);
			assert.equal(service.getItem('some.undefined.key', 'some.default'), 'some.default');

			service.setItem('some.null.key', null);
			assert.equal(service.getItem('some.null.key', 'some.default'), 'some.default');
		});

export async function main(argv: string[]): Promise<any> {
	let args: ParsedArgs;

	try {
		args = parseCLIProcessArgv(argv);
	} catch (err) {
		console.error(err.message);
		return;
	}

	// Help
	if (args.help) {
		console.log(buildHelpMessage(product.nameLong, product.applicationName, pkg.version));
	}

	// Version Info
	else if (args.version) {
		console.log(`${pkg.version}\n${product.commit}\n${process.arch}`);
	}

	// Extensions Management
	else if (shouldSpawnCliProcess(args)) {
		const cli = await new Promise<IMainCli>((c, e) => require(['vs/code/node/cliProcessMain'], c, e));
		await cli.main(args);
		return;
	}

	// Write File
	else if (args['file-write']) {
		const source = args._[0];
		const target = args._[1];

		// Validate
		if (
			!source || !target || source === target ||					// make sure source and target are provided and are not the same
			!paths.isAbsolute(source) || !paths.isAbsolute(target) ||	// make sure both source and target are absolute paths
			!fs.existsSync(source) || !fs.statSync(source).isFile() ||	// make sure source exists as file
			!fs.existsSync(target) || !fs.statSync(target).isFile()		// make sure target exists as file
		) {
			throw new Error('Using --file-write with invalid arguments.');
		}

		try {

			// Check for readonly status and chmod if so if we are told so
			let targetMode: number = 0;
			let restoreMode = false;
			if (!!args['file-chmod']) {
				targetMode = fs.statSync(target).mode;
				if (!(targetMode & 128) /* readonly */) {
					fs.chmodSync(target, targetMode | 128);
					restoreMode = true;
				}
			}

			// Write source to target
			const data = fs.readFileSync(source);
			if (isWindows) {
				// On Windows we use a different strategy of saving the file
				// by first truncating the file and then writing with r+ mode.
				// This helps to save hidden files on Windows
				// (see https://github.com/Microsoft/vscode/issues/931) and
				// prevent removing alternate data streams
				// (see https://github.com/Microsoft/vscode/issues/6363)
				fs.truncateSync(target, 0);
				writeFileAndFlushSync(target, data, { flag: 'r+' });
			} else {
				writeFileAndFlushSync(target, data);
			}

			// Restore previous mode as needed
			if (restoreMode) {
				fs.chmodSync(target, targetMode);
			}
		} catch (error) {
			error.message = `Error using --file-write: ${error.message}`;
			throw error;
		}
	}

	// Just Code
	else {
		const env = assign({}, process.env, {
			'VSCODE_CLI': '1', // this will signal Code that it was spawned from this module
			'ELECTRON_NO_ATTACH_CONSOLE': '1'
		});

		delete env['ELECTRON_RUN_AS_NODE'];

		const processCallbacks: ((child: ChildProcess) => Promise<any>)[] = [];

		const verbose = args.verbose || args.status || typeof args['upload-logs'] !== 'undefined';
		if (verbose) {
			env['ELECTRON_ENABLE_LOGGING'] = '1';

			processCallbacks.push(async child => {
				child.stdout.on('data', (data: Buffer) => console.log(data.toString('utf8').trim()));
				child.stderr.on('data', (data: Buffer) => console.log(data.toString('utf8').trim()));

				await new Promise(c => child.once('exit', () => c()));
//.........这里部分代码省略.........