tween<V>(from: V, to: V, duration: number, setValue: (value: V)=>void, easeFunc?: (t: number)=>number): TweenController

since

// tween bean to mouse position
tween(bean.pos, mousePos(), 1, (p) => bean.pos = p, easings.easeOutBounce)

// tween() returns a then-able that can be used with await
await tween(bean.opacity, 1, 0.5, (val) => bean.opacity = val, easings.easeOutQuad)