How to use the thingtalk.Formatter function in thingtalk

constructor(manager, debug) {
        this._userInputQueue = new AsyncQueue();
        this._notifyQueue = new AsyncQueue();

        this._debug = debug;
        this.manager = manager;
        this.formatter = new ThingTalk.Formatter(manager.platform.locale, manager.platform.timezone, manager.schemas, manager.gettext);
        this.icon = null;
        this.expecting = null;
        this.platformData = null;
        this._choices = null;

        this._mgrResolve = null;
        this._mgrPromise = null;
    }