Vue核心技术-60,Vuex-热重载

一,前言

本编简单介绍Vuex热重载,使用webpack提供的HMR实现
先将搜罗到的配置列出来,后续在做补充

二,热重载

使用webpack的热模替换(HMR)插件(Hot Module Replacement API)
Vuex支持在开发过程中热重载mutation、module、action和getter

对于mutation和模块,需要使用store.hotUpdate()方法：

src/store/index.js:

import Vue from 'vue'
import Vuex from 'vuex'
import * as getters from './getters'
import * as actions from './actions'
import * as mutations from './mutations'

Vue.use(Vuex)

const state = {
  count: 0,
  history: []
}

const store = new Vuex.Store({
  state,
  getters,
  actions,
  mutations
})

if (module.hot) {
  module.hot.accept([
    './getters',
    './actions',
    './mutations'
  ], () => {
    store.hotUpdate({
      getters: require('./getters'),
      actions: require('./actions'),
      mutations: require('./mutations')
    })
  })
}

export default store

webpack配置文件:webpack.config.js

const fs = require('fs')
const path = require('path')
const webpack = require('webpack')
const VueLoaderPlugin = require('vue-loader/lib/plugin')

module.exports = {
  mode: 'development',

  entry: fs.readdirSync(__dirname).reduce((entries, dir) => {
    const fullDir = path.join(__dirname, dir)
    const entry = path.join(fullDir, 'app.js')
    if (fs.statSync(fullDir).isDirectory() && fs.existsSync(entry)) {
      entries[dir] = ['webpack-hot-middleware/client', entry]
    }

    return entries
  }, {}),

  output: {
    path: path.join(__dirname, '__build__'),
    filename: '[name].js',
    chunkFilename: '[id].chunk.js',
    publicPath: '/__build__/'
  },

  module: {
    rules: [
      { test: /\.js$/, exclude: /node_modules/, use: ['babel-loader'] },
      { test: /\.vue$/, use: ['vue-loader'] },
      { test: /\.css$/, use: ['vue-style-loader', 'css-loader'] }
    ]
  },

  resolve: {
    alias: {
      vuex: path.resolve(__dirname, '../src/index.esm.js')
    }
  },

  optimization: {
    splitChunks: {
      cacheGroups: {
        vendors: {
          name: 'shared',
          filename: 'shared.js',
          chunks: 'initial'
        }
      }
    }
  },

  plugins: [
    new VueLoaderPlugin(),
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NoEmitOnErrorsPlugin()
  ]

}