JAVASCRIPT

redux action

import { createActions, handleActions, combineActions } from 'redux-actions';

const defaultState = { counter: 10 };

const { increment, decrement } = createActions({
  INCREMENT: (amount = 1) => ({ amount }),
  DECREMENT: (amount = 1) => ({ amount: -amount })
});

const reducer = handleActions({  
  [combineActions(increment, decrement)]: (state, action) => {
      return { ...state, counter: state.counter + action.payload.amount };
    }
  },
  defaultState
);

export default reducer;

redux actions.js

export const UPDATE_PRODUCTS = "UPDATE_PRODUCTS";
export const UPDATE_CATEGORIES = "UPDATE_CATEGORIES";
export const UPDATE_CURRENT_CATEGORY = "UPDATE_CURRENT_CATEGORY";

redux actions

const loginUser = {
  return {
    type: "login",
    payload: "sign in"
  }
}

define redux action

let action={
  type: 'LOGIN'
}