Adds an object to the behavior.
InvalidOperationException
if the tween has already been started.
Optional
easing: EasingFunctionConfigures a tween and starts it.
Optional
easing: EasingFunctionConfigures a tween and starts it. Returns undefined if nothing to tween.
Optional
easing: EasingFunctionGenerated using TypeDoc
A factory entity that can configure and start a tween.