如何使 webpack 仅针对特定构建导入 polyfill?

我刚刚设法让 webpack 创建两个单独的构建,一个用于 es5,另一个用于 es6。请参阅下面的配置文件:


const path = require("path");


const common = require("./webpack.common");

const merge = require("webpack-merge");

const CleanWebpackPlugin = require("clean-webpack-plugin");

const MiniCssExtractPlugin = require("mini-css-extract-plugin");

const OptimizeCssAssetsPlugin = require("optimize-css-assets-webpack-plugin");

const TerserPlugin = require("terser-webpack-plugin");

var HtmlWebpackPlugin = require("html-webpack-plugin");


const es5Config = merge(common,{

  mode: "production",

  output: {

    filename: "[name].[contentHash].bundle.es5.js",

    path: path.resolve(__dirname, "dist")

  },

  optimization: {

    minimizer: [

      new OptimizeCssAssetsPlugin(),

      new TerserPlugin(),

      new HtmlWebpackPlugin({

        template: "./src/template.html",

        minify: {

          removeAttributeQuotes: true,

          collapseWhitespace: true,

          removeComments: true

        }

      }),

    ]

  },

  plugins: [


    new MiniCssExtractPlugin({ filename: "[name].[contentHash].css" }),

      new CleanWebpackPlugin(),

    ],


  module: {

    rules: [

      {

        test: /\.scss$/,

        use: [

          MiniCssExtractPlugin.loader, //3. Extract css into files

          "css-loader", //2. Turns css into commonjs

          "sass-loader" //1. Turns sass into css

        ]

      },

module.exports = [es5Config, es6Config];

现在的问题是我希望 webpack 仅为 es5 构建导入 polyfill。并使用usebuilins设置为usage并不能填充任何内容。


我是否可能使用错误,也许与 node_modules 包相关?


所以我只是在主文件中导入 polyfill,例如:


import "core-js/stable";

import "regenerator-runtime/runtime";

如何使这些导入仅添加到 es5 构建中?或者我如何包含来自 webpack 的 polyfills/imports?


还有一个额外的问题,如果有人知道,我如何正确使用带有“usage”的usebuiltins?因为到目前为止,即使我认为 polifylls 已添加到我的主文件中,例如,我仍然会在 IE11 中收到符号错误。


叮当猫咪
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1回答

海绵宝宝撒

我想到了。这是 webpack 配置:常见:const path = require("path");module.exports = {  entry: {    main: "./src/index.js",    vendor: "./src/vendor.js"  },  module: {    rules: [      {        test: /\.html$/,        use: ["html-loader"]      },      {        test: /\.(svg|png|jpg|gif)$/,        use: {          loader: "file-loader",          options: {            name: "[name].[hash].[ext]",            outputPath: "imgs"          }        }      }    ]  }};产品:const path = require("path");const common = require("./webpack.common");const merge = require("webpack-merge");const CleanWebpackPlugin = require("clean-webpack-plugin");const MiniCssExtractPlugin = require("mini-css-extract-plugin");const OptimizeCssAssetsPlugin = require("optimize-css-assets-webpack-plugin");const TerserPlugin = require("terser-webpack-plugin");var HtmlWebpackPlugin = require("html-webpack-plugin");const { BundleAnalyzerPlugin } = require("webpack-bundle-analyzer");const es5Config = merge(common,{  mode: "production",  output: {    filename: "[name].[contentHash].bundle.es5.js",    path: path.resolve(__dirname, "dist")  },  optimization: {    runtimeChunk: 'single',    splitChunks: {      chunks: 'all',      maxInitialRequests: Infinity,      minSize: 0,      cacheGroups: {        vendor: {          test: /[\\/]node_modules[\\/]/,          name: (module) => {            // get the name. E.g. node_modules/packageName/not/this/part.js            // or node_modules/packageName            const packageName = module.context.match(/[\\/]node_modules[\\/](.*?)([\\/]|$)/)[1];            // npm package names are URL-safe, but some servers don't like @ symbols            return `npm.${packageName.replace('@', '')}`;          },        },      },    },    minimizer: [      new OptimizeCssAssetsPlugin(),      new TerserPlugin(),      new HtmlWebpackPlugin({        filename: 'main.aspx',        template: "./src/main.html",        // minify: {        //   removeAttributeQuotes: true,        //   collapseWhitespace: true,        //   removeComments: true        // }      }),    ]  },  plugins: [    new MiniCssExtractPlugin({ filename: "[name].[contentHash].css" }),    new CleanWebpackPlugin(),    new BundleAnalyzerPlugin(),    ],  module: {    rules: [      {        test: /\.scss$/,        use: [          MiniCssExtractPlugin.loader, //3. Extract css into files          "css-loader", //2. Turns css into commonjs          "sass-loader" //1. Turns sass into css        ]      },      {      test: /\.m?js$/,      exclude: /node_modules/,      //exclude: /node_modules\/(?!(\@pnp)\/).*/,       use: {        loader: 'babel-loader',        options: {          //configFile : './es5.babel.config.json',          presets: [            ['@babel/preset-env', {              modules: false,              useBuiltIns: false,              targets: {                browsers: [                  "IE 11"                ],              },            }],          ],        },      },    }],  },});const es6Config = merge(common, {  mode: "production",  output: {    filename: "[name].[contentHash].bundle.es6.js",    path: path.resolve(__dirname, "dist")  },  optimization: {    runtimeChunk: 'single',    splitChunks: {      chunks: 'all',      maxInitialRequests: Infinity,      minSize: 0,      cacheGroups: {        vendor: {          test: /[\\/]node_modules[\\/]/,          name: (module) => {            // get the name. E.g. node_modules/packageName/not/this/part.js            // or node_modules/packageName            const packageName = module.context.match(/[\\/]node_modules[\\/](.*?)([\\/]|$)/)[1];            // npm package names are URL-safe, but some servers don't like @ symbols            return `npm.${packageName.replace('@', '')}`;          },        },      },    },    minimizer: [      new OptimizeCssAssetsPlugin(),      new TerserPlugin(),      new HtmlWebpackPlugin({        filename: 'main_es6.html',        template: "./src/main.html",        // minify: {        //   removeAttributeQuotes: true,        //   collapseWhitespace: true,        //   removeComments: true        // }      }),    ]  },  plugins: [    new MiniCssExtractPlugin({ filename: "[name].[contentHash].css" }),    new CleanWebpackPlugin(),    ],  module: {    rules: [      {        test: /\.scss$/,        use: [          MiniCssExtractPlugin.loader, //3. Extract css into files          "css-loader", //2. Turns css into commonjs          "sass-loader" //1. Turns sass into css        ]      },  ],  },});module.exports = [ es5Config, es6Config];babel.config.json:{  "plugins": [    [      "@babel/plugin-transform-runtime",      {        "absoluteRuntime": true,        "helpers": true,        "regenerator": true,        "useESModules": false      }    ]  ]}因此,与 cdn polyfill 相结合,可以仅加载适用于 IE11 的 polifylls。它也有自己的构建。这里唯一的问题是,生成的输出将具有单独的文件,并且 es5 构建的所有脚本中应该没有模块。另外对于 es6 都应该有模块。然后我必须手动添加那些我可以轻松制作自定义模板来处理的内容。但随后,polyfill 的脚本被删除,我仍然需要手动合并 html 文件。有人知道如何处理吗?编辑: 1 - 对于属性,您可以使用 HtmlWebpackPlugin hooks () 或 ScriptExtHtmlWebpackPlugin 将属性放置在标签中。在这里找到一些带有钩子的代码:const HtmlWebpackPlugin = require('html-webpack-plugin');class es5TagTransformerHook {  apply (compiler) {    compiler.hooks.compilation.tap('MyPlugin', (compilation) => {        HtmlWebpackPlugin.getHooks(compilation).alterAssetTagGroups.tapAsync(        'es5TagTransformerHook', stacktraces        async (data, cb) => {          // Manipulate the content          // data.html += 'The Magic Footer'          // Tell webpack to move on          data.bodyTags.forEach(t=>t.tagName === 'script'?t.attributes.nomodule = true:null)          cb(null, data)        }      )          })  }}module.exports = es5TagTransformerHook
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