645 webpack常用plugins：clean-webpack-plugin，html-webpack-plugin，webpack.DefinePlug

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认识Plugin

CleanWebpackPlugin

HtmlWebpackPlugin

生成的index.html分析

自定义HTML模板

自定义模板数据填充

DefinePlugin的介绍

DefinePlugin的使用

CopyWebpackPlugin

目录结构

wk.config.js

const path = require('path');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const { DefinePlugin } = require('webpack'); // DefinePlugin是webpack内置插件
const CopyWebpackPlugin = require('copy-webpack-plugin');

module.exports = {
  entry: "./src/main.js",
  output: {
    filename: "js/bundle.js",
    // 必须是一个绝对路径
    path: path.resolve(__dirname, "./build"),
    // assetModuleFilename: "img/[name].[hash:6][ext]"
  },
  module: {
    rules: [
      {
        // 规则使用正则表达式
        test: /\.css$/, // 匹配资源
        use: [
          // { loader: "css-loader" },
          // 注意: 编写顺序(从下往上, 从右往做, 从后往前)
          "style-loader",
          {
            loader: "css-loader",
            options: {
              importLoaders: 1
            }
          },
          "postcss-loader"
        ],
        // loader: "css-loader"
      },
      {
        test: /\.less$/,
        use: [
          "style-loader",
          {
            loader: "css-loader",
            options: {
              importLoaders: 2
            }
          },
          "postcss-loader",
          "less-loader"
        ]
      },
      {
        test: /\.(png|jpe?g|gif|svg)$/,
        // type: "asset/resource", file-loader的效果
        // type: "asset/inline", url-loader
        type: "asset",
        generator: {
          filename: "img/[name].[hash:6][ext]"
        },
        parser: {
          dataUrlCondition: {
            maxSize: 100 * 1024
          }
        }
      },
      {
        test: /\.ttf|eot|woff2?$/i,
        type: "asset/resource",
        generator: {
          filename: "font/[name].[hash:6][ext]"
        }
      }
    ]
  },
  plugins: [
    new CleanWebpackPlugin(),
    new HtmlWebpackPlugin({
      title: "哈哈 webpack",
      template: "./public/index.html"
    }),
    new DefinePlugin({
      // 要包裹两层引号
      BASE_URL: '"./"'
    }),
    new CopyWebpackPlugin({
      patterns: [
        {
          // to: xxx, // 不用写，默认会使用output.path
          from: "public",
          globOptions: {
            ignore: [
              "**/index.html",
              "**/.DS_Store",
              "**/abc.txt"
            ]
          }
        }
      ]
    })
  ]
}

publuc/index.html

<!DOCTYPE html>
<html lang="">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    
    <link rel="icon" href="<%= BASE_URL %>favicon.ico">
    
    <title><%= htmlWebpackPlugin.options.title %></title>
  </head>
  <body>
    <noscript>
      <strong>We're sorry but <%= htmlWebpackPlugin.options.title %> doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
    </noscript>
    <div id="app"></div>
    <!-- built files will be auto injected -->
  </body>
</html>

build/index.html

<!DOCTYPE html>
<html lang="">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    
    <link rel="icon" href="./favicon.ico">
    
    <title>杰帅的webpack</title>
  <script defer src="js/bundle.js"></script></head>
  <body>
    <noscript>
      <strong>We're sorry but 杰帅的webpack doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
    </noscript>
    <div id="app"></div>
    <!-- built files will be auto injected -->
  </body>
</html>