vue脚手架初始化项目中配置文件webpack.base.conf.js代码含义

'use strict'
const path = require('path')
const utils = require('./utils')
const config = require('../config')
const vueLoaderConfig = require('./vue-loader.conf')

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

module.exports = {
  context: path.resolve(__dirname, '../'),
  entry: { // 配置webpack编译入口
    app: './src/main.js'
  },
  output: {// 配置webpack输出路径和命名规则
    path: config.build.assetsRoot, // webpack输出的目标文件夹路径（例如：/dist）

//assetsRoot引用自config/index.js文件-build属性中assetsRoot: path.resolve(__dirname, '../dist')
    filename: '[name].js',// 输出文件命名格式，基于文件的md5生成Hash名称的script来防止缓存
    publicPath: process.env.NODE_ENV === 'production'
      ? config.build.assetsPublicPath
      : config.dev.assetsPublicPath
  },
  resolve: {//resolve解析
    extensions: ['.js', '.vue', '.json'],//require或import时可以不加文件扩展名，自动添加扩展名进行匹配
    alias: {//配置别名，import或require时可以用别名，加快webpack查找模块的速度
      'vue$': 'vue/dist/vue.esm.js',
      '@': resolve('src'),
    }
  },
  module: {
    rules: [
      {
        test: /\.vue$/,//使用vue-loader解析.vue文件
        loader: 'vue-loader',
        options: vueLoaderConfig
      },
      {
        test: /\.js$/,//使用babel-loader解析.js文件
        loader: 'babel-loader',
        include: [resolve('src'), resolve('test'), resolve('node_modules/webpack-dev-server/client')]
      },
      {
        test: /\.(png|jpe?g|gif|svg)(\?.*)?$/,
        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: {
    setImmediate: false,
    dgram: 'empty',
    fs: 'empty',
    net: 'empty',
    tls: 'empty',
    child_process: 'empty'
  }
}