MainRoutes.js

import React from 'react';
import { Switch, Route } from 'react-router-dom';

import LoginPage from '../pages/login/LoginPage';
import MainPage from '../pages/main/MainPage';

export default ({ eventEmitter }) => (
  <Switch>
    <Route exact path="/" component={LoginPage} />
    <Route path="/login" component={LoginPage} />
    <Route
      path="/process"
      render={props => <MainPage eventEmitter={eventEmitter} {...props} />}
    />
  </Switch>
);