RxJS for full screen image resizing

gistfile1.ts

var gestureObservable = Rx.Observable.createWithDisposable(function (observer) {
    var gesture = new MSGesture();
    gesture.target = gestureTarget;

    var pointerSub = Rx.Observable.fromEvent(gestureTarget, "pointerdown")
        .subscribe((ev: any) => gesture.addPointer(ev.pointerId));
    var gestureSub = Rx.Observable.fromEvent(gestureTarget, "MSGestureTap")
        .subscribe((ev: MSGestureEvent) => observer.onNext(ev));
    return new Rx.CompositeDisposable(
        pointerSub,
        gestureSub,
        new Rx.Disposable(() => gesture.stop()));
}).publish().refCount();

var sizeObservable = Rx.Observable.combineLatest(
    Rx.Observable.fromCallback(imageSizeGetter)(),
    RxEx.Observable.fromEventMixins(window, "resize")
        .select(() => [window.innerWidth, window.innerHeight])
        .startWith([window.innerWidth, window.innerHeight]),
    (t1, t2) => [t1[0], t1[1], t2[0], t2[1]]
    ).publish().refCount();

sizeObservable.select(imageManipulator).subscribe(function (sizeMeta) {
    image.width = sizeMeta.shrinkedWidth;
    image.height = sizeMeta.shrinkedHeight;
    image.style.transform =
    "translate(" +
    ((sizeMeta.pageWidth - sizeMeta.shrinkedWidth) / 2 | 0) + "px," +
    ((sizeMeta.pageHeight - sizeMeta.shrinkedHeight) / 2 | 0) + "px)";
    WinJS.Utilities.removeClass(image, sizeMeta.expandClass);
});

gestureObservable
    .combineLatest(sizeObservable.select(imageManipulator), (v1, v2) => [v1, v2])
    .distinctUntilChanged((v) => v[0])
    .select((v) => v[1])
    .subscribe(function (sizeMeta: SizeMeta) {
        if (WinJS.Utilities.hasClass(image, sizeMeta.expandClass)) {
            image.width = sizeMeta.shrinkedWidth;
            image.height = sizeMeta.shrinkedHeight;
            image.style.transform =
            "translate(" +
            ((sizeMeta.pageWidth - sizeMeta.shrinkedWidth) / 2 | 0) + "px," +
            ((sizeMeta.pageHeight - sizeMeta.shrinkedHeight) / 2 | 0) + "px)";
        } else {
            image.width = sizeMeta.expandedWidth;
            image.height = sizeMeta.expandedHeight;
            image.style.transform = "translate(0,0)";
        }
        WinJS.Utilities.toggleClass(image, sizeMeta.expandClass);
    });