webpack-demos

demos for webpack4

How to use

# clone the repository
git clone git@github.com:8788/webpack-demos.git

# install dependencies
cd basic/
npm install

# build for production
npm run build

Index

1. zero-config
2. basic
3. loader
4. plugins
5. dev-server
6. extract-css
7. image-base64
8. es6+
9. lazy-loading
10. writing-a-loader
11. writing-a-plugin

zero-config

// package.json
{
  // ...
  "scripts": {
    "build": "webpack --mode production"
  },
  // ...
}

npm run build

basic

// webpack.config.js
const path = require('path')

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, './dist')
  }
}

loader

// webpack.config.js
const path = require('path')

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, './dist')
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader']
      }
    ]
  }
}

plugins

// webpack.config.js
const path = require('path')
const HtmlWebpackPlugin = require('html-webpack-plugin')

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, './dist')
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader']
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
      filename: 'index.html'
    })
  ]
}

dev-server

// webpack.config.js
const path = require('path')
const webpack = require('webpack')
const HtmlWebpackPlugin = require('html-webpack-plugin')

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, './dist')
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader']
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
      filename: 'index.html'
    }),
    new webpack.HotModuleReplacementPlugin()
  ],
  devServer: {
    host: '127.0.0.1',
    port: 8081,
    contentBase: path.join(__dirname, 'dist'),
    open: true,
    hot: true,
    disableHostCheck: true,
    proxy: {
      // http://127.0.0.1:81/v2/5c0e62192e00005400043e63
      '/v2': {
        target: 'http://www.mocky.io/',
        changeOrigin: true
      }
    },
    before (app) {
      app.get('/api', function(req, res) {
        res.json({ code: 200, msg: 'mock test' })
      })
    }
  }
}

extract-css

// webpack.config.js
const path = require('path')
const webpack = require('webpack')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, './dist')
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader
          },
          'css-loader'
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
      filename: 'index.html'
    }),
    new MiniCssExtractPlugin({
      filename: '[name].css',
      chunkFilename: '[id].css'
    }),
    new webpack.HotModuleReplacementPlugin()
  ],
  devServer: {
    host: '127.0.0.1',
    port: 8081,
    contentBase: path.join(__dirname, 'dist'),
    open: true,
    hot: true,
    disableHostCheck: true
  }
}

image-base64

// webpack.config.js
const path = require('path')
const webpack = require('webpack')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin')

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, './dist')
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader
          },
          'css-loader'
        ]
      },
      {
        test: /\.(png|jpg|gif)$/,
        use: [
          {
            loader: 'url-loader',
            options: {
              limit: 4 * 1024, // inline files smaller than 4k
              name: '[name].[hash:6].[ext]'
            }
          }
        ]
      },
      {
        test: /\.svg$/,
        use: [
          {
            loader: 'svg-url-loader',
            options: {
              limit: 4 * 1024, // inline files smaller than 4k
              name: '[name].[hash:6].[ext]'
            }
          }
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
      filename: 'index.html'
    }),
    new MiniCssExtractPlugin({
      filename: '[name].css',
      chunkFilename: '[id].css'
    }),
    new OptimizeCSSAssetsPlugin(),
    new webpack.HotModuleReplacementPlugin()
  ],
  devServer: {
    host: '127.0.0.1',
    port: 8081,
    contentBase: path.join(__dirname, 'dist'),
    open: true,
    hot: true,
    disableHostCheck: true
  }
}

es6+

// webpack.config.js
const path = require('path')
const webpack = require('webpack')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, './dist')
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader
          },
          'css-loader'
        ]
      },
      {
        test: /\.js$/,
        use: 'babel-loader'
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
      filename: 'index.html'
    }),
    new MiniCssExtractPlugin({
      filename: '[name].css',
      chunkFilename: '[id].css'
    }),
    new webpack.HotModuleReplacementPlugin()
  ],
  devServer: {
    host: '127.0.0.1',
    port: 8081,
    contentBase: path.join(__dirname, 'dist'),
    open: true,
    hot: true,
    disableHostCheck: true
  }
}

lazy-loading

// webpack.config.js
const path = require('path')
const webpack = require('webpack')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    chunkFilename: '[name].bundle.js',
    path: path.resolve(__dirname, './dist')
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader
          },
          'css-loader'
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
      filename: 'index.html'
    }),
    new MiniCssExtractPlugin({
      filename: '[name].css',
      chunkFilename: '[id].css'
    }),
    new webpack.HotModuleReplacementPlugin()
  ],
  devServer: {
    host: '127.0.0.1',
    port: 8081,
    contentBase: path.join(__dirname, 'dist'),
    open: true,
    hot: true,
    disableHostCheck: true
  }
}

writing-a-loader

// markdown-loader.js
const marked = require('marked')
const loaderUtils = require('loader-utils')

module.exports = function (src) {
  const options = loaderUtils.getOptions(this)
  this.cacheable()
  marked.setOptions(options)
  return marked(src)
}

// webpack.config.js
const webpack = require('webpack')
const path = require('path')
const HtmlWebpackPlugin = require('html-webpack-plugin')

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'dist')
  },
  module: {
    rules: [
      {
        test: /\.md$/,
        use: [
          'html-loader',
          {
            loader: path.resolve('./loader/markdown-loader.js')
          }
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
      filename: 'index.html'
    }),
    new webpack.HotModuleReplacementPlugin()
  ],
  devServer: {
    host: '127.0.0.1',
    port: 8081,
    contentBase: path.join(__dirname, 'dist'),
    open: true,
    hot: true
  }
}

writing-a-plugin

// time-plugin.js
const colors = require('colors')

class TimePlugin {
  apply (compiler) {
    compiler.hooks.beforeRun.tap('TimePlugin', () => this.startTime = Date.now())
    compiler.hooks.done.tapAsync('TimePlugin', (compilation, callback) => {
      this.endTime = Date.now()
      callback()
      console.log(`\nCompile done in: ${this.endTime - this.startTime}ms`.green)
    })
  }
}

module.exports = TimePlugin

// webpack.config.js
const path = require('path')
const webpack = require('webpack')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const TimePlugin = require('./plugin/time-plugin.js')

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, './dist')
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader']
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
      filename: 'index.html'
    }),
    new webpack.HotModuleReplacementPlugin(),
    new TimePlugin()
  ],
  devServer: {
    host: '127.0.0.1',
    port: 8081,
    contentBase: path.join(__dirname, 'dist'),
    open: true,
    hot: true
  }
}