How to use the @angular2-material/core/async/promise-completer.PromiseCompleter function in @angular2-material/core

}
            else {
                return isOpen ? this._openPromise : this._closePromise;
            }
        }
        this._opened = isOpen;
        this._transition = true;
        if (isOpen) {
            this.onOpenStart.emit(null);
        }
        else {
            this.onCloseStart.emit(null);
        }
        if (isOpen) {
            if (this._openPromise == null) {
                var completer = new promise_completer_1.PromiseCompleter();
                this._openPromise = completer.promise;
                this._openPromiseReject = completer.reject;
                this._openPromiseResolve = completer.resolve;
            }
            return this._openPromise;
        }
        else {
            if (this._closePromise == null) {
                var completer = new promise_completer_1.PromiseCompleter();
                this._closePromise = completer.promise;
                this._closePromiseReject = completer.reject;
                this._closePromiseResolve = completer.resolve;
            }
            return this._closePromise;
        }
    };