1 'use strict' 2 // 工具=> build/util.js 3 const utils = require('./utils') 4 // 配置=> build/config/index.js 5 const config = require('../config') 6  7 const isProduction = process.env.NODE_ENV === 'production' 8 const sourceMapEnabled = isProduction 9   ? config.build.productionSourceMap10   : config.dev.cssSourceMap11 12 13 //对象模块导出{} 14 module.exports = {15   loaders: utils.cssLoaders({16     sourceMap: sourceMapEnabled,17     extract: isProduction18   }),19   cssSourceMap: sourceMapEnabled,20   cacheBusting: config.dev.cacheBusting,21   transformToRequire: {22     video: ['src', 'poster'],23     source: 'src',24     img: 'src',25     image: 'xlink:href'26   }27 }