description

# Animation constructor

Animation([AnimationEffectReadOnly effect, AnimationTimeline timeline ])

## Implementation

    factory Animation(
        [AnimationEffectReadOnly effect, AnimationTimeline timeline]) {
      if (timeline != null) {
        return Animation._create_1(effect, timeline);
      }
      if (effect != null) {
        return Animation._create_2(effect);
      }
      return Animation._create_3();
    }