webpack.dev.conf.js

var utils = require('./utils')
var webpack = require('webpack')
var config = require('../config')

// 一个可以合并数组和对象的插件
var merge = require('webpack-merge')
var baseWebpackConfig = require('./webpack.base.conf')

// 一个用于生成HTML文件并自动注入依赖文件（link/script）的webpack插件
var HtmlWebpackPlugin = require('html-webpack-plugin')

// 用于更友好地输出webpack的警告、错误等信息
var FriendlyErrorsPlugin = require('friendly-errors-webpack-plugin')

// add hot-reload related code to entry chunks
Object.keys(baseWebpackConfig.entry).forEach(function (name) {
baseWebpackConfig.entry[name] = ['./build/dev-client'].concat(baseWebpackConfig.entry[name])
})

// 合并基础的webpack配置
module.exports = merge(baseWebpackConfig, {
// 配置样式文件的处理规则，使用styleLoaders

module: {
rules: utils.styleLoaders({ sourceMap: config.dev.cssSourceMap })
},

// 配置Source Maps。在开发中使用cheap-module-eval-source-map更快
devtool: '#cheap-module-eval-source-map',

// 配置webpack插件
plugins: [
new webpack.DefinePlugin({
'process.env': config.dev.env
}),
// https://github.com/glenjamin/webpack-hot-middleware#installation--usage
new webpack.HotModuleReplacementPlugin(),

// 后页面中的报错不会阻塞，但是会在编译结束后报错
new webpack.NoEmitOnErrorsPlugin(),
// https://github.com/ampedandwired/html-webpack-plugin
new HtmlWebpackPlugin({
filename: 'index.html',
template: 'index.html',
inject: true
}),
new FriendlyErrorsPlugin()
]
})