src/vs/workbench/contrib/tasks/browser/abstractTaskService.ts/TaskMap/add
class TaskMap:	public add(workspaceFolder: IWorkspace | IWorkspaceFolder | string, ...task: Task[]): void {
		const key = this.getKey(workspaceFolder);
		let values = this._store.get(key);
		if (!values) {
			values = [];
			this._store.set(key, values);
		}
		values.push(...task);
	}