How to get computed style of animation

[rotibi]

Hi all,
I rotate a canvas view using nativescript animation:

const animationDefinition = {
            target: target, // CanvasView
            rotate: 360
            duration: duration,
            curve: CoreTypes.AnimationCurve.cubicBezier(0.2, 0, 0.1, 1)
        };

I tried to use animation frame (requestAnimationFrame) but because don't work (callback is called a single time) I used
rxjs interval:

 interval(50)
            .pipe(takeWhile(() => this.animation.isPlaying, true))
            .subscribe(() => {
               console.log(target.rotate); // is 0
               getComputedCssValues(target); // rotate is also 0
               getComputedStyle(canvasEl); // canvasEl taken with ViewChildren, error: ReferenceError: getComputedStyle is not defined
            });

I use nativescript 8.4.
How can I get computed rotate style to see canvas rotation?
Thanks in advance!