vue-cli—03-webpack基本配置说明

Myth丶恋晨 2021-12-14 08:57 344阅读 0赞

下来我们一个一个介绍build文件夹下面的一些配置

check-versions.js

'use strict'
    const chalk = require('chalk') //输入终端的一些样式，红色或者绿色，可以通过这个模块来定义
    const semver = require('semver') // 处理版本号
    const packageConfig = require('../package.json')
    const shell = require('shelljs') //可以执行终端的命令
    
    function exec (cmd) {
      return require('child_process').execSync(cmd).toString().trim()
    }
    
    // 此处定义node版本的一些要求
    const versionRequirements = [
      {
        name: 'node',
        currentVersion: semver.clean(process.version), //当前node的版本
        versionRequirement: packageConfig.engines.node //规定版本的要求
      }
    ]
    
    // 假如命令中有npm，那么把npm的版本要求也加入到里面
    if (shell.which('npm')) {
      versionRequirements.push({
        name: 'npm',
        currentVersion: exec('npm --version'),  //执行exec拿到当前npm的版本
        versionRequirement: packageConfig.engines.npm //拿到npm的版本要求
      })
    }
    
    module.exports = function () {
      const warnings = []
    
      // 遍历versionRequirements这个数据
      for (let i = 0; i < versionRequirements.length; i++) {
        const mod = versionRequirements[i]
    
        // 查看当前的版本是否在要求的版本之内
        if (!semver.satisfies(mod.currentVersion, mod.versionRequirement)) {
          // 如果不在的话就push一些警告信息
          warnings.push(mod.name + ': ' +
            chalk.red(mod.currentVersion) + ' should be ' +
            chalk.green(mod.versionRequirement)
          )
        }
      }
    
      // 假如有错误信息，则在终端打印一些信息
      if (warnings.length) {
        console.log('')
        console.log(chalk.yellow('To use this template, you must update following to modules:'))
        console.log()
    
        for (let i = 0; i < warnings.length; i++) {
          const warning = warnings[i]
          console.log('  ' + warning)
        }
    
        console.log()
        // 最终退出程序
        process.exit(1)
      }
    }

webpack.base.conf.js

'use strict'
    const path = require('path')
    const utils = require('./utils')
    const config = require('../config')
    const vueLoaderConfig = require('./vue-loader.conf')
    
    // 此函数做路径的拼接
    function resolve (dir) {
      return path.join(__dirname, '..', dir)
    }
    
    const createLintingRule = () => ({
      test: /\.(js|vue)$/,
      loader: 'eslint-loader',
      enforce: 'pre',
      include: [resolve('src'), resolve('test')],
      options: {
        formatter: require('eslint-friendly-formatter'),
        emitWarning: !config.dev.showEslintErrorsInOverlay
      }
    })
    
    module.exports = {
      context: path.resolve(__dirname, '../'),
      // 入口
      entry: {
        app: './src/main.js'
      },
      output: {
        path: config.build.assetsRoot,
        filename: '[name].js',
        // 访问资源的时候从根目录去访问
        publicPath: process.env.NODE_ENV === 'production'
          ? config.build.assetsPublicPath
          : config.dev.assetsPublicPath
      },
      // 引进来一些模块的时候的配置
      resolve: {
        // 文件的后缀名
        extensions: ['.js', '.vue', '.json'],
        // 别名
        alias: {
          'vue$': 'vue/dist/vue.esm.js',
          '@': resolve('src'),
        }
      },
      module: {
        rules: [
          ...(config.dev.useEslint ? [createLintingRule()] : []),
          {
            test: /\.vue$/,
            loader: 'vue-loader',
            options: vueLoaderConfig
          },
          {
            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'
      }
    }