createActionCreatorWithEffect.js

const EFFECT = Symbol('@@Reatom/EFFECT');

function createActionCreatorWithEffect(type, effect) {
  return (payload) => ({
    type,
    payload,
    [EFFECT]: (store) => effect(payload, store),
  })
}

store.subscribe(action => {
  if (typeof action[EFFECT] === 'function') {
    action[EFFECT](store);
  }
});