app/javascripts/reducers/index.js
import { combineReducers } from 'redux'
import * as app from './app'
import * as label from './label'
import * as user from './user'
import * as channel from './channel'
export const rootReducer = combineReducers({
app: app.reducer,
label: label.reducer,
user: user.reducer,
channel: channel.reducer
})