// This is the webpack config used for unit tests.

var utils = require('./utils')//utils.js文件导入

var webpack = require('webpack')//webpack模块导入

var merge = require('webpack-merge')//合并模块插件

var baseConfig = require('./webpack.base.conf')//导入基础配置webpack.base.conf.js

var webpackConfig = merge(baseConfig, {

  // use inline sourcemap for karma-sourcemap-loader

  module: {

    rules: utils.styleLoaders()

  },

  devtool: '#inline-source-map',

  plugins: [

    new webpack.DefinePlugin({

      'process.env': require('../config/test.env')//指定环境为测试环境  test.env中设置了NODE_ENV=‘testing’

    })

  ]

})

// no need for app entry during tests

delete webpackConfig.entry

module.exports = webpackConfig