extensions/gulp/src/main.ts/FolderDetector/getTask
class FolderDetector:	public async getTask(_task: vscode.Task): Promise<vscode.Task | undefined> {
		const gulpTask = (<any>_task.definition).task;
		if (gulpTask) {
			let kind: GulpTaskDefinition = (<any>_task.definition);
			let options: vscode.ShellExecutionOptions = { cwd: this.workspaceFolder.uri.fsPath };
			let task = new vscode.Task(kind, this.workspaceFolder, gulpTask, 'gulp', new vscode.ShellExecution(await this._gulpCommand, [gulpTask], options));
			return task;
		}
		return undefined;
	}