Angular: FlatMap manquant dans rxjs "rxjs": "5.0.0-beta.2"

J'ai essayé de faire la fonction flatMap dans angular2 mais cela montre une erreur car flatMap n'est pas une fonction et

ERROR in ./src/app/services/login-refresh-token-services.ts
(155,40): error TS2339: Property 'flatMap' does not exist on type 'Subscription'.

J'ai vérifié le fichier rxjs/rx. il n'y a pas de telles données flatMap. donc, à ma connaissance, l'opérateur flatmap rxjs est manquant

"use strict";
/* tslint:disable:no-unused-variable */
// Subject imported before Observable to bypass circular dependency issue since
// Subject extends Observable and Observable references Subject in it's
// definition
var Subject_1 = require('./Subject');
exports.Subject = Subject_1.Subject;
/* tslint:enable:no-unused-variable */
var Observable_1 = require('./Observable');
exports.Observable = Observable_1.Observable;
// statics
/* tslint:disable:no-use-before-declare */
require('./add/observable/combineLatest');
require('./add/observable/concat');
require('./add/observable/merge');
require('./add/observable/race');
require('./add/observable/bindCallback');
require('./add/observable/bindNodeCallback');
require('./add/observable/defer');
require('./add/observable/empty');
require('./add/observable/forkJoin');
require('./add/observable/from');
require('./add/observable/fromArray');
require('./add/observable/fromEvent');
require('./add/observable/fromEventPattern');
require('./add/observable/fromPromise');
require('./add/observable/interval');
require('./add/observable/never');
require('./add/observable/range');
require('./add/observable/throw');
require('./add/observable/timer');
require('./add/observable/zip');
//operators
require('./add/operator/buffer');
require('./add/operator/bufferCount');
require('./add/operator/bufferTime');
require('./add/operator/bufferToggle');
require('./add/operator/bufferWhen');
require('./add/operator/cache');
require('./add/operator/catch');
require('./add/operator/combineAll');
require('./add/operator/combineLatest');
require('./add/operator/concat');
require('./add/operator/concatAll');
require('./add/operator/concatMap');
require('./add/operator/concatMapTo');
require('./add/operator/count');
require('./add/operator/dematerialize');
require('./add/operator/debounce');
require('./add/operator/debounceTime');
require('./add/operator/defaultIfEmpty');
require('./add/operator/delay');
require('./add/operator/delayWhen');
require('./add/operator/distinctUntilChanged');
require('./add/operator/do');
require('./add/operator/expand');
require('./add/operator/filter');
require('./add/operator/finally');
require('./add/operator/first');
require('./add/operator/groupBy');
require('./add/operator/ignoreElements');
require('./add/operator/inspect');
require('./add/operator/inspectTime');
require('./add/operator/every');
require('./add/operator/last');
require('./add/operator/let');
require('./add/operator/map');
require('./add/operator/mapTo');
require('./add/operator/materialize');
require('./add/operator/merge');
require('./add/operator/mergeAll');
require('./add/operator/mergeMap');
require('./add/operator/mergeMapTo');
require('./add/operator/multicast');
require('./add/operator/observeOn');
require('./add/operator/partition');
require('./add/operator/pluck');
require('./add/operator/publish');
require('./add/operator/publishBehavior');
require('./add/operator/publishReplay');
require('./add/operator/publishLast');
require('./add/operator/race');
require('./add/operator/reduce');
require('./add/operator/repeat');
require('./add/operator/retry');
require('./add/operator/retryWhen');
require('./add/operator/sample');
require('./add/operator/sampleTime');
require('./add/operator/scan');
require('./add/operator/share');
require('./add/operator/single');
require('./add/operator/skip');
require('./add/operator/skipUntil');
require('./add/operator/skipWhile');
require('./add/operator/startWith');
require('./add/operator/subscribeOn');
require('./add/operator/switch');
require('./add/operator/switchMap');
require('./add/operator/switchMapTo');
require('./add/operator/take');
require('./add/operator/takeLast');
require('./add/operator/takeUntil');
require('./add/operator/takeWhile');
require('./add/operator/throttle');
require('./add/operator/throttleTime');
require('./add/operator/timeout');
require('./add/operator/timeoutWith');
require('./add/operator/toArray');
require('./add/operator/toPromise');
require('./add/operator/window');
require('./add/operator/windowCount');
require('./add/operator/windowTime');
require('./add/operator/windowToggle');
require('./add/operator/windowWhen');
require('./add/operator/withLatestFrom');
require('./add/operator/zip');
require('./add/operator/zipAll');
/* tslint:disable:no-unused-variable */
var Operator_1 = require('./Operator');
exports.Operator = Operator_1.Operator;
var Subscription_1 = require('./Subscription');
exports.Subscription = Subscription_1.Subscription;
exports.UnsubscriptionError = Subscription_1.UnsubscriptionError;
var Subscriber_1 = require('./Subscriber');
exports.Subscriber = Subscriber_1.Subscriber;
var AsyncSubject_1 = require('./subject/AsyncSubject');
exports.AsyncSubject = AsyncSubject_1.AsyncSubject;
var ReplaySubject_1 = require('./subject/ReplaySubject');
exports.ReplaySubject = ReplaySubject_1.ReplaySubject;
var BehaviorSubject_1 = require('./subject/BehaviorSubject');
exports.BehaviorSubject = BehaviorSubject_1.BehaviorSubject;
var ConnectableObservable_1 = require('./observable/ConnectableObservable');
exports.ConnectableObservable = ConnectableObservable_1.ConnectableObservable;
var Notification_1 = require('./Notification');
exports.Notification = Notification_1.Notification;
var EmptyError_1 = require('./util/EmptyError');
exports.EmptyError = EmptyError_1.EmptyError;
var ArgumentOutOfRangeError_1 = require('./util/ArgumentOutOfRangeError');
exports.ArgumentOutOfRangeError = ArgumentOutOfRangeError_1.ArgumentOutOfRangeError;
var ObjectUnsubscribedError_1 = require('./util/ObjectUnsubscribedError');
exports.ObjectUnsubscribedError = ObjectUnsubscribedError_1.ObjectUnsubscribedError;
var asap_1 = require('./scheduler/asap');
var queue_1 = require('./scheduler/queue');
var rxSubscriber_1 = require('./symbol/rxSubscriber');
/* tslint:enable:no-unused-variable */
/* tslint:disable:no-var-keyword */
var Scheduler = {
    asap: asap_1.asap,
    queue: queue_1.queue
};
exports.Scheduler = Scheduler;
var Symbol = {
    rxSubscriber: rxSubscriber_1.rxSubscriber
};
exports.Symbol = Symbol;
/* tslint:enable:no-var-keyword */
//# sourceMappingURL=Rx.js.map