effect function

EffectStop<Effect> effect(void fn())

Implementation

EffectStop<Effect> effect(void Function() fn) {
  final effect = _Effect(fn);
  if (system.activeSub != null) {
    system.link(effect, system.activeSub!);
  } else if (system.activeScope != null) {
    system.link(effect, system.activeScope!);
  }
  system.runEffect(effect);
  return EffectStop(effect);
}