Webpack编译速度非常慢

Question

Webpack编译速度非常慢

3

我最近开始使用Webpack来编译我的JS和SASS，之前我用的是GULP来编译SASS，速度非常快。但是现在使用Webpack编译相同的JS/SASS代码时，编译时间达到了6秒，速度非常慢。

下面是编译日志(webpack -w)，只修改SASS或JS时的信息：

Hash: 0dd09b4f671dc58e7c36
Version: webpack 4.30.0
Time: 6319ms
Built at: 2019-04-29 11:58:43
                                          Asset       Size  Chunks             Chunk Names
                                  css/admin.css    405 KiB   admin  [emitted]  admin
                                    css/app.css    253 KiB     app  [emitted]  app
 css/files/169356a469a7a7b5ab89187fa1aae785.otf    192 KiB          [emitted]
 css/files/2299ad0b3f63413f026dfec20c205b8f.gif   8.28 KiB          [emitted]
 css/files/2f99a85426a45e0c7f8707aae53af803.ttf    168 KiB          [emitted]
 css/files/31f15875975aab69085470aabbfec802.png   1.32 KiB          [emitted]
 css/files/3a80587b4415f8b0b21cdeb8e380a86c.eot    168 KiB          [emitted]
 css/files/59409df6e088d74fd4220b43a12b85f8.otf    188 KiB          [emitted]
 css/files/84abe14c9756256a4b91300ba3e4ec62.ttf    167 KiB          [emitted]
 css/files/84b76dee6b27b795e89e3649078a11c2.png   1.33 KiB          [emitted]
css/files/b2918f7cd1f06a16aecf9124e47dba13.woff   68.3 KiB          [emitted]
 css/files/be5e6c1cc25bfbd6d92647d56aae28d4.eot    168 KiB          [emitted]
 css/files/d9d2d0b1308cb694aa8116915592e2a9.png  280 bytes          [emitted]
css/files/ff372e76c393da9b47fda7fd860c181d.woff   67.6 KiB          [emitted]
                                    js/admin.js    3.4 MiB   admin  [emitted]  admin
                                      js/app.js   4.35 MiB     app  [emitted]  app
 + 33 hidden assets
Entrypoint app = css/app.css js/app.js
Entrypoint admin = css/admin.css js/admin.js
[./src/sass/style.scss] 39 bytes {app} [built]
    + 105 hidden modules
Child mini-css-extract-plugin ../../../pierre gomba/www/jobin/node_modules/css-loader/index.js??ref--7-1!../../../pierre gomba/www/jobin/node_modules/postcss-loader/li                                                                      b/index.js??ref--7-2!../../../pierre gomba/www/jobin/node_modules/sass-loader/lib/loader.js??ref--7-3!../../../pierre gomba/www/jobin/src/sass/style.scss:
    Entrypoint mini-css-extract-plugin = *
    [./node_modules/css-loader/index.js?!./node_modules/postcss-loader/lib/index.js?!./node_modules/sass-loader/lib/loader.js?!./src/sass/style.scss] ./node_modules/cs                                                                      s-loader??ref--7-1!./node_modules/postcss-loader/lib??ref--7-2!./node_modules/sass-loader/lib/loader.js??ref--7-3!./src/sass/style.scss 756 KiB {mini-css-extract-plugi                                                                      n} [built]
    [./src/fonts/Raleway/Raleway-Bold.eot] 69 bytes {mini-css-extract-plugin} [built]
    [./src/fonts/Raleway/Raleway-Bold.otf] 69 bytes {mini-css-extract-plugin} [built]
    [./src/fonts/Raleway/Raleway-Bold.ttf] 69 bytes {mini-css-extract-plugin} [built]
    [./src/fonts/Raleway/Raleway-Bold.woff] 70 bytes {mini-css-extract-plugin} [built]
    [./src/fonts/Raleway/Raleway-Regular.eot] 69 bytes {mini-css-extract-plugin} [built]
    [./src/fonts/Raleway/Raleway-Regular.otf] 69 bytes {mini-css-extract-plugin} [built]
    [./src/fonts/Raleway/Raleway-Regular.ttf] 69 bytes {mini-css-extract-plugin} [built]
    [./src/fonts/Raleway/Raleway-Regular.woff] 70 bytes {mini-css-extract-plugin} [built]
        + 7 hidden modules

我的 webpack 配置：

const path = require('path');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const UglifyJsPlugin = require("uglifyjs-webpack-plugin");
const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin");

module.exports = {
  mode: 'development',
  entry: {
    app: [
      './src/js/app.js',
      './src/sass/style.scss',
    ],
    admin: [
      './src/js/admin.js',
      './src/sass/admin.scss',
    ],
  },
  output: {
    path: path.resolve(__dirname, './public/'),
    filename: 'js/[name].js'
  },
  resolve: {
      alias: {
          'jquery': require.resolve('jquery'),
      }
  },
  module: {
    rules: [
      {
        test: /\.js/,
        loader: 'babel-loader'
      },
      {
        test: require.resolve('jquery'),
        use: [
          {
            loader: 'expose-loader',
            options: 'jQuery'
          },
          {
            loader: 'expose-loader',
            options: '$'
          }
        ]
      },
      {
        test : /\.css$/,
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: 'css-loader',
            options: { sourceMap: true }
          },
          {
            loader: 'postcss-loader',
            options: { sourceMap: true }
          }
        ]
      },
      {
        test: /\.scss$/,
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: 'css-loader',
            options: { sourceMap: true }
          },
          {
            loader: 'postcss-loader',
            options: { sourceMap: true }
          },
          {
            loader: "sass-loader",
            options: { sourceMap: true }
          }
        ]
      },
      {
        test: /.(png|jpg|gif|woff(2)?|eot|otf|ttf|svg)(\?[a-z0-9=\.]+)?$/,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: 'css/files/[hash].[ext]',
              publicPath: '..'
            }
          }
        ]
      }
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: "css/[name].css"
    })
  ],
  optimization: {
    minimize: true,
    minimizer: [
      new UglifyJsPlugin({
        cache: true,
        parallel: true,
        sourceMap: true
      }),
      new OptimizeCSSAssetsPlugin({})
    ]
  },
};

那么，为什么编译需要这么长时间？我该怎么做才能改善它呢？谢谢！

- Pythorogus

1个回答

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可以查看英文原文，
原文链接

- Alonad · Accepted Answer

一些建议：

排除node_modules文件夹，以便babel不对其进行处理。

test: /\.js$/,
loader: 'babel-loader',
exclude: /node_modules/

第二步，将其用于Babel加载器中，它将缓存结果，并且不会完全从头重新编译。

loader: 'babel-loader?cacheDirectory'

如果您需要更快的速度，有两个选项。第一个选项是使用webpack-dev-server。它将编译您的代码而不创建/dist文件夹，也就是说它将在内存中存储和提供编译后的代码。

另一个选项，与上一个选项一样仅用于开发，是在开发过程中不使用webpack。您可以使用gulp将Sass编译为CSS，并向浏览器提供ES6模块。现代浏览器可以很好地理解它们。您只需要为它们提供type="module"，如下所示：

<script type="module" src="javascripts/main.js"></script>

main.js将成为入口文件，其中包含导入项。当您的代码包过于庞大时，您当然可以添加多个JavaScript入口点。

所有压缩和转换都是用于生产环境的，因此您可以在部署之前只运行一次webpack。