webpack3整理（第三节/满三节）

‘use strict‘
const path = require(‘path‘)
const utils = require(‘./utils‘)
const config = require(‘../config‘)  //想要使用一个插件，你只需要 require() 它，然后把它添加到 plugins 数组中
const vueLoaderConfig = require(‘./vue-loader.conf‘)

function resolve (dir) {
  return path.join(__dirname, ‘..‘, dir)
}

const createLintingRule = () => ({
  test: /\.(js|vue)$/,
  loader: ‘eslint-loader‘,
  enforce: ‘pre‘,  //// 标识应用这些规则，即使规则覆盖（高级选项）
  include: [resolve(‘src‘), resolve(‘test‘)],
  options: {
    formatter: require(‘eslint-friendly-formatter‘),
    emitWarning: !config.dev.showEslintErrorsInOverlay
  }
})

const webapckConfigs = {
  //mode: "production",    // "production" | "development" | "none"环境切换
  context: path.resolve(__dirname, ‘../‘),  //// webpack 的主目录
  entry: { //entry属性来作为构建其内部依赖图的开始来指定一个入口起点（或多个入口起点）。默认值为 ./src
    app: ‘./src/main.js‘
  },
  output: {//output属性告诉 webpack 在哪里输出它所创建的 bundles(包)，以及如何命名这些文件，默认值为 ./dist
    path: config.build.assetsRoot,  //目标输出目录 path 的绝对路径其实就是dist文件夹下面。
    filename: ‘[name].js‘,  //ilename 用于输出文件的文件名。
    publicPath: process.env.NODE_ENV === ‘production‘
      ? config.build.assetsPublicPath
      : config.dev.assetsPublicPath
  },
  resolve: {
    extensions: [‘.js‘, ‘.vue‘, ‘.json‘], //此选项告诉解析器在解析中能够接受哪些扩展名
    alias: {  //模块别名列表,模块别名相对于当前上下文导入
      ‘vue$‘: ‘vue/dist/vue.esm.js‘,
      ‘@‘: resolve(‘src‘),
    }
  },
  // plugins: [
    // new webpack.ProvidePlugin({
    //   $: ‘webpack-zepto‘//引入zepto
    // })
  //   new webpack.optimize.UglifyJsPlugin(),
  //   new HtmlWebpackPlugin({template: ‘./src/index.html‘})
  // ],
  module: {
    rules: [
      ...(config.dev.useEslint ? [createLintingRule()] : []),
      {
        test: /\.vue$/, //test属性用于标识出应该被对应的 loader 进行转换的某个或某些文件,use 属性，表示进行转换时，应该使用哪个 loader
        loader: ‘vue-loader‘,
        options: vueLoaderConfig
         // test 和 include 具有相同的作用，都是必须匹配选项
         // exclude 是必不匹配选项（优先于 test 和 include）
         //尽量避免 exclude，更倾向于使用 include,在 include 和 exclude 中使用绝对路径数组
      },
      {
        test: /\.js$/,
        loader: ‘babel-loader‘,
        include: [resolve(‘src‘), resolve(‘test‘), resolve(‘node_modules/webpack-dev-server/client‘)]
      },
      {
        test: /\.(png|jpe?g|gif|svg)(\?.*)?$/,
        loader: ‘url-loader‘,
        options: {
          limit: 10000,
          name: utils.assetsPath(‘img/[name].[hash:7].[ext]‘)
        }
      },
      {
        test: /\.(mp4|webm|ogg|mp3|wav|flac|aac)(\?.*)?$/,
        loader: ‘url-loader‘,
        options: {
          limit: 10000,
          name: utils.assetsPath(‘media/[name].[hash:7].[ext]‘)
        }
      },
      {
        test: /\.(woff2?|eot|ttf|otf)(\?.*)?$/,
        loader: ‘url-loader‘,
        options: {
          limit: 10000,
          name: utils.assetsPath(‘fonts/[name].[hash:7].[ext]‘)
        }
      }
    ]
  },
  node: {
    // prevent webpack from injecting useless setImmediate polyfill because Vue
    // source contains it (although only uses it if it‘s native).
    setImmediate: false,
    // prevent webpack from injecting mocks to Node native modules
    // that does not make sense for the client
    dgram: ‘empty‘,
    fs: ‘empty‘,
    net: ‘empty‘,
    tls: ‘empty‘,
    child_process: ‘empty‘
  }
}

module.exports = webapckConfigs; //导出配置