webpack学习笔记-devServer、babel、esli

有空学一下webpack，记录一下学习笔记
目前用到功能是配置devServer，babel，eslint，全局引用外部模块，生产环境代码做压缩混淆。
将来应该还会学一下分包等性能优化
下面贴一下配置项
webpack.config.js

const path = require('path')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const OptimizeCssAssetsPlugin = require('optimize-css-assets-webpack-plugin')
const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
// const webpack = require('webpack')
module.exports = {
  // entry:["@babel/polyfill",'./src/index.js'],
  entry: ['./src/index.js'],
  // mode: 'development',
  mode: 'production',
  // 优化项
  optimization: {
    minimizer: [
      // 压缩js
      new UglifyJsPlugin({
        cache: true,
        sourceMap: true,
        parallel: true
      }),
      new OptimizeCssAssetsPlugin()

    ]
  },
  output: {
    filename: 'build.[hash:8].js',
    path: path.resolve(__dirname, 'dist')
  },
  plugins: [
    // 压缩html
    new HtmlWebpackPlugin({
      template: './src/index.html',
      filename: 'index.html',
      minify: {
        removeAttributeQuotes: true,
        removeEmptyAttributes: true,
        collapseWhitespace: true
      },
      hash: true
    }),
    // 压缩css
    new MiniCssExtractPlugin({
      filename: 'index.css'
    })
    // new webpack.ProvidePlugin({
    //   $: 'jquery'
    // })
  ],
  // 全局引入外部jq，需要在index.html上定义<script src></script>
  externals: {
    jquery: 'jQuery'
  },
  module: {
    rules: [{
      test: /\.css$/,
      use: [
        MiniCssExtractPlugin.loader,
        'css-loader',
        'postcss-loader'
      ]
    },
    {
      test: /\.scss$/,
      use: [
        MiniCssExtractPlugin.loader,
        'css-loader',
        'postcss-loader',
        'sass-loader'

      ]
    },
    {
      test: /\.js$/,
      exclude: /(node_modules|bower_components)/,
      include: path.resolve(__dirname, 'src'),
      use: [{
        loader: 'babel-loader',
        options: {
          presets: [
            // ['@babel/preset-env',{"useBuiltIns": "usage",'corejs':2}]
            ['@babel/preset-env']
          ],
          plugins: [
            ['@babel/plugin-proposal-class-properties', {
              loose: true
            }],
            ['@babel/plugin-proposal-decorators', {
              legacy: true
            }],
            '@babel/plugin-transform-runtime'
          ],
          // 解决import和module.exports重复导致报错问题
          sourceType: 'unambiguous'
        }
      }]
    },
    {
      test: /\.js$/,
      use: [{
        loader: 'eslint-loader',
        options: {
          plugins: [
            'eslint-plugin-import',
            'eslint-plugin-node',
            'eslint-plugin-promise',
            'eslint-plugin-standard'
          ],
          exclude: ['/node_modules/', '/dist/'],
          include: path.resolve(__dirname, 'src'),
          enforce: 'pre'
        }
      }]
    }]
  },
  devServer: {
    contentBase: './dist',
    progress: true,
    open: true,
  // mock数据，也可以自己写一个server.js用webpack自带的express来写个伪服务
    before(app) {
      app.get('/api/user', (req, res) => {
        res.json({ name: 'fcy server before' })
      })
    },
    proxy: {
      '/api': {
        target: 'http://localhost:3000', // hyd 远程
        ws: true,
        changeOrigin: true,
        // pathRewrite: {'^/api' : ''}的含义是重写url地址，把url的地址里面含有 '/api' 这样的 替换成 '',相当于前端给后端一个统一的baseURL
        pathRewrite: {
          '^/api': ''
        }
      }

    }
  }
}

package.json

{
  "name": "mywebpack",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "webpack --config webpack.config.js",
    "serve": "webpack-dev-server",
    "delete": "rimraf node_modules"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@babel/polyfill": "^7.10.1",
    "@babel/runtime": "^7.10.3",
    "webpack": "^4.43.0",
    "webpack-cli": "^3.3.12"
  },
  "devDependencies": {
    "@babel/core": "^7.10.3",
    "@babel/parser": "^7.10.3",
    "@babel/plugin-proposal-class-properties": "^7.10.1",
    "@babel/plugin-proposal-decorators": "^7.10.3",
    "@babel/plugin-transform-runtime": "^7.10.3",
    "@babel/preset-env": "^7.10.3",
    "@vue/eslint-config-standard": "^5.1.2",
    "autoprefixer": "^9.8.4",
    "babel-eslint": "^10.1.0",
    "babel-loader": "^8.1.0",
    "css-loader": "^3.6.0",
    "eslint": "^7.3.1",
    "eslint-loader": "^4.0.2",
    "eslint-plugin-import": "^2.21.2",
    "eslint-plugin-node": "^11.1.0",
    "eslint-plugin-promise": "^4.2.1",
    "eslint-plugin-standard": "^4.0.1",
    "eslint-plugin-vue": "^6.2.2",
    "expose-loader": "^1.0.0",
    "file-loader": "^6.0.0",
    "html-webpack-plugin": "^4.3.0",
    "html-withimg-loader": "^0.1.16",
    "jquery": "^3.5.1",
    "less": "^3.11.3",
    "less-loader": "^6.1.2",
    "mini-css-extract-plugin": "^0.9.0",
    "node-sass": "^4.14.1",
    "optimize-css-assets-webpack-plugin": "^5.0.3",
    "postcss-loader": "^3.0.0",
    "sass-loader": "^8.0.2",
    "style-loader": "^1.2.1",
    "uglifyjs-webpack-plugin": "^2.2.0",
    "url-loader": "^4.1.0",
    "webpack-dev-server": "^3.11.0"
  }
}

postcss.config.js(用于给css添加浏览器前缀)

module.exports = {
  plugins: [require('autoprefixer')]
}

.eslintrc eslint官网可以下载

module.exports = {
  root: true,
  env: {
    browser: true,
    node: true,
    es6: true
  },
  'extends': [
    'plugin:vue/essential',
    '@vue/standard'
  ],
  plugins: [
    'vue'
  ],
  rules: {
    // no-console error 代表存在console就会报错， off 代表时关闭，on代表时开启
    'no-console': process.env.NODE_ENV === 'production' ? 'off' : 'off',
    'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off',
    'accessor-pairs': 2,
    'arrow-spacing': [2, {
      'before': true,
      'after': true
    }],
    'block-spacing': [2, 'always'],
    'brace-style': [2, '1tbs', {
      'allowSingleLine': true
    }],
    'camelcase': [0, {
      'properties': 'always'
    }],
    'comma-dangle': [2, 'never'],
    'comma-spacing': [2, {
      'before': false,
      'after': true
    }],
    'comma-style': [2, 'last'],
    'constructor-super': 2,
    'curly': [2, 'multi-line'],
    'dot-location': [2, 'property'],
    'eol-last': 2,
    'eqeqeq': [2, 'allow-null'],
    'generator-star-spacing': [2, {
      'before': true,
      'after': true
    }],
    'handle-callback-err': [2, '^(err|error)$'],
    'indent': [2, 2, {
      'SwitchCase': 1
    }],
    'jsx-quotes': [2, 'prefer-single'],
    'key-spacing': [2, {
      'beforeColon': false,
      'afterColon': true
    }],
    'keyword-spacing': [2, {
      'before': true,
      'after': true
    }],
    'new-cap': [2, {
      'newIsCap': true,
      'capIsNew': false
    }],
    'new-parens': 2,
    'no-array-constructor': 2,
    'no-caller': 2,
    // 'no-console': 'off',
    'no-class-assign': 2,
    'no-cond-assign': 2,
    'no-const-assign': 2,
    'no-control-regex': 0,
    'no-delete-var': 2,
    'no-dupe-args': 2,
    'no-dupe-class-members': 2,
    'no-dupe-keys': 2,
    'no-duplicate-case': 2,
    'no-empty-character-class': 2,
    'no-empty-pattern': 2,
    'no-eval': 2,
    'no-ex-assign': 2,
    'no-extend-native': 2,
    'no-extra-bind': 2,
    'no-extra-boolean-cast': 2,
    'no-extra-parens': [2, 'functions'],
    'no-fallthrough': 2,
    'no-floating-decimal': 2,
    'no-func-assign': 2,
    'no-implied-eval': 2,
    'no-inner-declarations': [2, 'functions'],
    'no-invalid-regexp': 2,
    'no-irregular-whitespace': 2,
    'no-iterator': 2,
    'no-label-var': 2,
    'no-labels': [2, {
      'allowLoop': false,
      'allowSwitch': false
    }],
    'no-lone-blocks': 2,
    'no-mixed-spaces-and-tabs': 2,
    'no-multi-spaces': 2,
    'no-multi-str': 2,
    'no-multiple-empty-lines': [2, {
      'max': 1
    }],
    'no-native-reassign': 2,
    'no-negated-in-lhs': 2,
    'no-new-object': 2,
    'no-new-require': 2,
    'no-new-symbol': 2,
    'no-new-wrappers': 2,
    'no-obj-calls': 2,
    'no-octal': 2,
    'no-octal-escape': 2,
    'no-path-concat': 2,
    'no-proto': 2,
    'no-redeclare': 2,
    'no-regex-spaces': 2,
    'no-return-assign': [2, 'except-parens'],
    'no-self-assign': 2,
    'no-self-compare': 2,
    'no-sequences': 2,
    'no-shadow-restricted-names': 2,
    'no-spaced-func': 2,
    'no-sparse-arrays': 2,
    'no-this-before-super': 2,
    'no-throw-literal': 2,
    'no-trailing-spaces': 2,
    'no-undef': 2,
    'no-undef-init': 2,
    'no-unexpected-multiline': 2,
    'no-unmodified-loop-condition': 2,
    'no-unneeded-ternary': [2, {
      'defaultAssignment': false
    }],
    'no-unreachable': 2,
    'no-unsafe-finally': 2,
    'no-unused-vars': [2, {
      'vars': 'all',
      'args': 'none'
    }],
    'no-useless-call': 2,
    'no-useless-computed-key': 2,
    'no-useless-constructor': 2,
    'no-useless-escape': 0,
    'no-whitespace-before-property': 2,
    'no-with': 2,
    'one-var': [2, {
      'initialized': 'never'
    }],
    'operator-linebreak': [2, 'after', {
      'overrides': {
        '?': 'before',
        ':': 'before'
      }
    }],
    'padded-blocks': [2, 'never'],
    'quotes': [2, 'single', {
      'avoidEscape': true,
      'allowTemplateLiterals': true
    }],
    'semi': [2, 'never'],
    'semi-spacing': [2, {
      'before': false,
      'after': true
    }],
    'space-before-blocks': [2, 'always'],
    'space-before-function-paren': [2, 'never'],
    'space-in-parens': [2, 'never'],
    'space-infix-ops': 2,
    'space-unary-ops': [2, {
      'words': true,
      'nonwords': false
    }],
    'spaced-comment': [2, 'always', {
      'markers': ['global', 'globals', 'eslint', 'eslint-disable', '*package', '!', ',']
    }],
    'template-curly-spacing': [2, 'never'],
    'use-isnan': 2,
    'valid-typeof': 2,
    'wrap-iife': [2, 'any'],
    'yield-star-spacing': [2, 'both'],
    'yoda': [2, 'never'],
    'prefer-const': 2,
    // 'no-debugger': process.env.NODE_ENV === 'production' ? 2 : 0,
    'object-curly-spacing': [2, 'always', {
      objectsInObjects: false
    }],
    'array-bracket-spacing': [2, 'never']
  },
  parserOptions: {
    parser: 'babel-eslint'
  }
}