JV5/src/reducers/counter.js

import * as types from "../constants/ActionTypes";

import initialState from "../initialState";

export default (state = initialState.counter, action) => {
	switch (action.type) {
		case types.INCREASE: {
			console.log("INCREASE", action);
			return { ...state, data: state.data + 1 };
		}
		default:
			return state;
	}
};