Function effect

packages/xstate-store/src/alien.ts:440–460

(fn: () => void)

}

export function effect(fn: () => void): () => void {
  const e: EffectNode = {
    fn,
    subs: undefined,
    subsTail: undefined,
    deps: undefined,
    depsTail: undefined,
    flags: ReactiveFlags.Watching | ReactiveFlags.RecursedCheck
  };
  const prevSub = setActiveSub(e);
  if (prevSub !== undefined) {
    link(e, prevSub, 0);
  }
  try {
    e.fn();
  } finally {
    activeSub = prevSub;
    e.flags &= ~ReactiveFlags.RecursedCheck;
  }
  return effectOper.bind(e);
}

export function effectScope(fn: () => void): () => void {
  const e: ReactiveNode = {