如何使用 Webpack 为 Babel 包含节点模块

Question

跑步时

npm run build

我遇到了来自 uglify 的与 es6 相关的语法错误，所以我猜 babel 没有正确处理节点模块（秒到分钟）。

我的 .babelrc

{
  "presets": ["es2015", "stage-0"],
  "plugins": ["transform-runtime"],
  "comments": false,
  "env": {
    "test": {
      "plugins": [ "istanbul" ]
    }
  }
}

我的 Webpack 配置：

var path = require('path')
var config = require('../config')
var utils = require('./utils')
var projectRoot = path.resolve(__dirname, '../')

var env = process.env.NODE_ENV
// check env & config/index.js to decide whether to enable CSS source maps for the
// various preprocessor loaders added to vue-loader at the end of this file
var cssSourceMapDev = (env === 'development' && config.dev.cssSourceMap)
var cssSourceMapProd = (env === 'production' && config.build.productionSourceMap)
var useCssSourceMap = cssSourceMapDev || cssSourceMapProd

module.exports = {
  entry: {
    app: './src/main.js'
  },
  output: {
    path: config.build.assetsRoot,
    publicPath: process.env.NODE_ENV === 'production' ? config.build.assetsPublicPath : config.dev.assetsPublicPath,
    filename: '[name].js'
  },
  resolve: {
    extensions: ['', '.js', '.vue', '.json'],
    fallback: [path.join(__dirname, '../node_modules')],
    alias: {
      'vue$': 'vue/dist/vue.common.js',
      'src': path.resolve(__dirname, '../src'),
      'assets': path.resolve(__dirname, '../src/assets'),
      'components': path.resolve(__dirname, '../src/components')
    }
  },
  resolveLoader: {
    fallback: [path.join(__dirname, '../node_modules')]
  },
  module: {
    preLoaders: [
      {
        test: /\.vue$/,
        loader: 'eslint',
        include: [
          path.join(projectRoot, 'src')
        ],
        exclude: /node_modules/
      },
      {
        test: /\.js$/,
        loader: 'eslint',
        include: [
          path.join(projectRoot, 'src')
        ],
        exclude: /node_modules/
      }
    ],
    loaders: [
      {
        test: /\.vue$/,
        loader: 'vue'
      },
      {
        test: /\.js$/,
        loader: 'babel',
        include: [
          path.join(projectRoot, 'src'),
          'node_modules/sec-to-min'
        ],
        exclude: /node_modules/
      },
      {
        test: /\.json$/,
        loader: 'json'
      },
      {
        test: /\.(png|jpe?g|gif|svg)(\?.*)?$/,
        loader: 'url',
        query: {
          limit: 10000,
          name: utils.assetsPath('img/[name].[hash:7].[ext]')
        }
      },
      {
        test: /\.(woff2?|eot|ttf|otf)(\?.*)?$/,
        loader: 'url',
        query: {
          limit: 10000,
          name: utils.assetsPath('fonts/[name].[hash:7].[ext]')
        }
      }
    ]
  },
  eslint: {
    formatter: require('eslint-friendly-formatter')
  },
  vue: {
    loaders: utils.cssLoaders({ sourceMap: useCssSourceMap }),
    postcss: [
      require('autoprefixer')({
        browsers: ['last 2 versions']
      })
    ]
  }
}

＆错误：

来自 UglifyJs SyntaxError 的 static/js/vendor.8d64852626f0513309d9.js 中的错误：意外令牌：运算符 (>) [./~/sec-to-min/index.js:3,0]

我怎样才能直接 babel 编译这个模块？

Answer 1

请注意，在 Windows 上，路径中的斜杠将是 \，因此必须将上述解决方案更改为 exclude: /node_modules\\(?!(sec-to-min)\/).*/

这是对我有用的解决方案，使用 webpack 4.3 和 babel-loader 8.0.5，并使用推荐的 @babel/preset-env，改编自https://github.com/webpack/webpack/issues/2031# issuecomment-283517150

{
            test: /\.(js|jsx|mjs)$/,
            include: [paths.appSrc, paths.appNodeModules],
            exclude: function(modulePath) {
              return (
                /node_modules/.test(modulePath) &&
                !/node_modules\\react-dev-utils/.test(modulePath)
              );
            },
            loader: require.resolve('babel-loader'),
            options: {
              compact: true,
              presets: ['@babel/preset-env']
            }
          },

我发现使用排除函数很有帮助，因为我能够在函数中添加控制台日志来检查正则表达式匹配了哪些模块。

Answer 2

安装以下软件包

npm install babel-preset-es2015 --save-dev
npm install babel-preset-stage-0 --save-dev

在你的 babel 预设中添加es2015和stage-0

{
   "presets": ["es2015", "stage-0"],
}

更新 试试这个

{
    test: /\.js$/,
    use: {
      loader: 'babel-loader',
       options: {
        presets: ['env', 'react', 'stage-0'],
       },
    },
    include: [
      path.join(projectRoot, 'src'),
      'node_modules/sec-to-min'
    ],
    exclude: /node_modules/
  },