F_A_8_Exchange_app/src/reducer/index.js

import { combineReducers } from "redux";
import { reducer as formReducer } from 'redux-form';

import staffs from './staffs'
import searchStaff from './searchStaff'
import addStaff from './addStaff'

export default  combineReducers({
    staffs: staffs,
    searchStaff,
    addStaff,
    form: formReducer,
})