[Telichkin]

You can do what you want just in 17 lines of pure JavaScript. This is an example:

  const

  create_store = ({state, actions}) => {
    const

    after_update_do = [],

    subscribe = fn => after_update_do.push(fn),

    notify = () => after_update_do.forEach(fn => fn(state)),

    create_action = action => (...args) => {
      state = action(state, ...args);
      notify()
    };

    return Object.entries(actions).reduce((bound_actions, [action_name, action]) => 
      Object.assign({}, bound_actions, {[action_name]: create_action(action)}), 
      {subscribe})
  },

  counter = create_store({
    state: 0,
    actions: {
      increase: state => state + 1,
      
      decrease: state => state - 1,

      multiply_add: (state, a, b) => state * a + b,
    },
  });

  counter.subscribe(state => console.log('First reactive component was updated with: ' + state));
  counter.subscribe(state => console.log('Second reactive component was updated with: ' + state));

Now you can call all actions directly from the counter and update all components in reactive manner.

  counter.increase();
  // First reactive component was updated with: 1
  // Second reactive component was updated with: 1

  counter.multiply_add(2, 3)
  // First reactive component was updated with: 5
  // Second reactive component was updated with: 5