Method shiftTrack

src/composition/composition.ts:214–227

* Append a new track, it will be inserted at * index 0 and rendered last (top layer)

(Track: (new () => L) | L)

	 * index 0 and rendered last (top layer)
	 */
	public shiftTrack<L extends Track<Clip>>(Track: (new () => L) | L): L {
		// Check if track has been instantiated
		const track = typeof Track == 'object' ? Track : new Track();

		track.connect(this);

		this.stage.addChild(track.view);
		this.tracks.unshift(track);

		track.bubble(this);
		this.trigger('update', undefined);

		return track;
	}

	/**
	 * Create a track with the given type