一、升级babel7
网上已经有很多不错升级babel7的文章了，这里写下主要步骤
- 1、一键升级
npx babel-upgrade --write
- 运行命令行后发现
package.json、.babelrc都自动发生了变化，升级完成！是的，不用怀疑！如果遇到报错可以百度下报错内容进行对应修改，我是没有遇到错误，直接升级成功，幸福来得太突然了
- 2、polyfill
// .babelrc
....
"presets": [
[
"@babel/preset-env",
{
"modules": false,
+ "useBuiltIns": "usage",
+ "corejs": "2"
}
]
],
....
useBuiltIns修改为usage, 表示按需加载polyfill，移除项目中的import 'babel-polybill';corejs不设置会有warning提示，默认为2.x
- 3、transform-runtime使用多余Babel的帮助函数
// .babelrc
"plugins": [
- [
- "@babel/plugin-transform-runtime",
- {
- "corejs": 2
- }
- ],
+ "@babel/plugin-transform-runtime",
- 通过
webpack-bundle-analyzer插件打包分析发现，在vendor.js有很多core-js/library目录的代码引用- 原因是
transform-runtime会自动给js加上非全局的polyfillnpm i -D @babel/runtime安装依赖包，并修改.babelrc- 发现不支持
module.exports，可以通过babel-plugin-add-module-exports这个插件解决，建议改为export default
友情链接：babel升级7官网文档
二、升级webpack4
- 1、升级npm依赖包
- webpack 升级 (npm i webpack@4 -D)
- webpack-cli
- webpack-dev-server@3
- html-webpack-plugin (npm i html-webpack-plugin@3.2.0 -D)
- vue-loader(npm i vue-loader@15 -D)
- style-loader 最新
- vue-style-loader 最新
- mini-css-extract-plugin
- postcss-loader
- uglifyjs-webpack-plugin
- ....
上面列举的有的是新增的npm包，有的是旧的要更新的包，建议把和打包相关的包都更新到最新
- 2、vue-loader
// webapck.base.conf.js
const VueLoaderPlugin = require('vue-loader/lib/plugin')
....
module: {
rules: utils.styleLoaders()
},
plugins: [
new VueLoaderPlugin(),
....
]
... .
- 添加
VueLoaderPlugin、添加rules，具体参考vue-loader迁移官方文档- 这里
rules直接从vue模板里的utils.js获取
- 3、postcss
// .postcssrc.js
module.exports = {
plugins: [
require('autoprefixer'),
+ require('./build/plugins/px-convertor')({remUnit: 75}),
+ require('./build/plugins/svg-image-hex2rgb')(),
]
};
postcss之前是通过vue-loader的postcss属性设置的- 现在单独为
postcss-loader，把vue-loader的postcss属性的插件转到.postcssrc.js
// build/utils.js
function generateLoaders(loader, loaderOptions) {
+ let postcssLoader = {
+ loader: 'postcss-loader',
+ };
- let loaders = [cssLoader, pathLoader];
+ let loaders = [cssLoader, pathLoader, postcssLoader];
- 在
vue模板的utils.js添加postcss-loader，具体参考vue-loader迁移postcss部分的官方文档
- 4、CSS 提取
// build/utils.js
- const ExtractTextPlugin = require('extract-text-webpack-plugin');
+ var MiniCssExtractPlugin = require('mini-css-extract-plugin')
....
- list = ExtractTextPlugin.extract({
- use: loaders,
- fallback: 'vue-style-loader'
- });
+ list = [MiniCssExtractPlugin.loader].concat(loaders);
// webpack.prod.conf.js
- const ExtractTextPlugin = require('extract-text-webpack-plugin');
+ var MiniCssExtractPlugin = require('mini-css-extract-plugin')
....
- new ExtractTextPlugin({
+ new MiniCssExtractPlugin({
filename: utils.assetsPath('css/[name].[contenthash:29].css'),
allChunks: true
}),
- 弃用之前的
extract-text-webpack-plugin，改用mini-css-extract-plugin，具体参考css提取的官方文档
- 5、删除json-loader
// webapck.base.conf.js
- {
- test: /\.json$/,
- loader: 'json-loader'
- }
json-loader内置了
- 6、exclude使用绝对路径
// webapck.base.conf.js
{
test: /\.js$/,
loader: 'babel-loader',
include: [resolve('src'), resolve('test')],
- exclude: ['node_modules']
+ exclude: [path.resolve(__dirname, '../node_modules')]
},
- 7、css-loader删除minimize
// build/utils.js
let cssLoader = {
loader: 'css-loader',
options: {
- minimize: process.env.NODE_ENV === 'production',
sourceMap: options.sourceMap
}
};
- 8、
.styl文件加载出错
// build/utils.js
return {
css: generateLoaders(),
postcss: generateLoaders(),
less: generateLoaders('less'),
sass: generateLoaders('sass', {indentedSyntax: true}),
scss: generateLoaders('sass'),
- stylus: generateLoaders('stylus'),
- styl: generateLoaders('stylus')
+ 'stylus|styl': generateLoaders('stylus')
};
- 9、添加
mode
// webpack.dev.conf.js
const webpackConfig = merge(baseWebpackConfig, {
+ mode: 'development',
module: {
rules: utils.styleLoaders({sourceMap: true})
},
webpack4提供了development和production2个mode值，默认是production.
- 10、
SplitChunksPlugin代替CommonChunkPlugin
// webapck.prod.conf.js
plugins: [
- new webpack.optimize.CommonsChunkPlugin({
- name: 'vendor',
- minChunks: function (module, count) {
- return module.resource.indexOf(path.join(__dirname, '../node_modules')) === 0;
- }
- }),
- new webpack.optimize.CommonsChunkPlugin({
- name: 'common',
- chunks: ['vendor'],
- minChunks: function (module, count) {
- return module.resource.indexOf(path.join(__dirname, '../src')) === 0;
- }
- }),
- new webpack.optimize.CommonsChunkPlugin({
- name: 'manifest',
- chunks: ['vendor', 'common']
- }),
....
],
+ optimization: {
+ splitChunks: {
+ chunks: 'initial',
+ cacheGroups: {
+ common: {
+ test: /src/,
+ chunks: 'initial',
+ name: 'common',
+ priority: 9, // 优先
+ enforce: true,
+ },
+ vendor: {
+ test: /node_modules/,
+ chunks: 'initial',
+ name: 'vendor',
+ priority: 10, // 优先
+ enforce: true,
+ }
+ }
+ },
+ runtimeChunk: {
+ name: 'manifest'
+ }
+ },
- 11、
UglifyJsPlugin
// webapck.prod.conf.js
+ var UglifyJsPlugin = require('uglifyjs-webpack-plugin');
....
plugins: [
- new webpack.optimize.UglifyJsPlugin({
- compress: {
- warnings: false,
- drop_console: process.env.WEHOTEL_ENV !== 'test'
- },
- comments: false,
- sourceMap: false
- }),
....
],
optimization: {
+ minimizer: [
+ new UglifyJsPlugin({
+ uglifyOptions: {
+ warnings: false,
+ compress: {
+ drop_console: process.env.WEHOTEL_ENV !== 'test'
+ },
+ },
+ sourceMap: false,
+ extractComments: false,
+ }),
+ ],
- 12、
css顺序报错
WARNING in chunk common [mini-css-extract-plugin]
Conflicting order between:
* *css ./node_modules/css-loader/dist/cjs.js??ref--11-1!./node_modules/vue-loader/lib/loaders/stylePostLoader.js!./build/rules/path-loader??ref--11-2!./node_modules/postcss-loader/src!./node_modules/stylus-loader??ref--11-4!./src/sdk/components/dialog/index.stylus?vue&type=style&index=0&lang=stylus&
* css ./node_modules/css-loader/dist/cjs.js??ref--11-1!./node_modules/vue-loader/lib/loaders/stylePostLoader.js!./build/rules/path-loader??ref--11-2!./node_modules/postcss-loader/src!./node_modules/stylus-loader??ref--11-4!./src/sdk/components/calendar/index.stylus?vue&type=style&index=0&lang=stylus&
WARNING in chunk common [mini-css-extract-plugin]
Conflicting order between:
* *css ./node_modules/css-loader/dist/cjs.js??ref--11-1!./node_modules/vue-loader/lib/loaders/stylePostLoader.js!./build/rules/path-loader??ref--11-2!./node_modules/postcss-loader/src!./node_modules/stylus-loader??ref--11-4!./src/sdk/components/calendar/index.stylus?vue&type=style&index=0&lang=stylus&
* css ./node_modules/css-loader/dist/cjs.js??ref--11-1!./node_modules/vue-loader/lib/loaders/stylePostLoader.js!./build/rules/path-loader??ref--11-2!./node_modules/postcss-loader/src!./node_modules/stylus-loader??ref--11-4!./src/sdk/components/dialog/index.stylus?vue&type=style&index=0&lang=stylus&
- 意思是
/src/sdk/components/calendar/index.stylus和/src/sdk/components/dialog/index.stylus这两个文件在两个地方，引用顺序不一样，导致要提取css不知道哪个文件的css放前面- 处理方法是找到引用的地方，把这两个文件的引用先后顺序调整为一致
- 13、
require第三方amd文件报错
// src/main.js
- const {VueLazyload} = require('src/lib/js/lazyload.js');
+ import VueLazyload from 'vue-lazyload';
Vue.use(VueLazyload);
- 把第三方包
vue-lazyload的cdn文件下载下来引用报错- 直接改用
npm引用
- 14、自定义组件
// build/my-plugin/index.js
- compiler.plugin('compilation', compilation => {
+ compiler.hooks.compilation.tap(this.constructor.name, compilation => {
webpack4自定义组件的钩子采用hooks写法，具体参考编写一个插件
三、总结
打完收工。友情链接：webpack4官方升级文档
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