redux-zap-simple.js

import { prepareStore } from 'redux-zap'

const initialState = {
  count: 0,
  counting: false
}

export default prepareStore(initialState, {
  // Action "reset" that set count to 0
  // We return a partial state that will be applied to the current state
  reset: () => ({ count: 0 }),

  // Action "increment" that increments the count
  // We need the previous state, we can get it by returning a function
  increment: (n) => state => ({ count: state.count + n })
})