Vue - build - webpack.dev.conf.js解析

//合并基础的webpack配置
//使用styleLoaders
//配置Source Maps
//配置webpack插件
‘use strict’
const utils = require(’./utils’)
const webpack = require(‘webpack’)
const config = require(’…/config’)
const merge = require(‘webpack-merge’)
const path = require(‘path’)
const baseWebpackConfig = require(’./webpack.base.conf’)
const CopyWebpackPlugin = require(‘copy-webpack-plugin’)
//生成html文件并自动注入依赖文件的插件， script & link
const HtmlWebpackPlugin = require(‘html-webpack-plugin’)
//一个输出webpack警告，错误的插件
const FriendlyErrorsPlugin = require(‘friendly-errors-webpack-plugin’)
const portfinder = require(‘portfinder’)

const HOST = process.env.HOST
const PORT = process.env.PORT && Number(process.env.PORT)

const devWebpackConfig = merge(baseWebpackConfig, {
module: {
//使用styleLoaders处理样式文件
rules: utils.styleLoaders({ sourceMap: config.dev.cssSourceMap, usePostCSS: true })
},
// cheap-module-eval-source-map is faster for development
devtool: config.dev.devtool,

// these devServer options should be customized in /config/index.js
devServer: {
clientLogLevel: ‘warning’,
historyApiFallback: {
rewrites: [
{ from: /./, to: path.posix.join(config.dev.assetsPublicPath, ‘index.html’) },
],
},
hot: true,
contentBase: false, // since we use CopyWebpackPlugin.
compress: true,
host: HOST || config.dev.host,
port: PORT || config.dev.port,
open: config.dev.autoOpenBrowser,
overlay: config.dev.errorOverlay
? { warnings: false, errors: true }
: false,
publicPath: config.dev.assetsPublicPath,
proxy: config.dev.proxyTable,
quiet: true, // necessary for FriendlyErrorsPlugin
watchOptions: {
poll: config.dev.poll,
}
},
//配置webpack插件
plugins: [
new webpack.DefinePlugin({
‘process.env’: require(’…/config/dev.env’)
}),
new webpack.HotModuleReplacementPlugin(),
new webpack.NamedModulesPlugin(), // HMR shows correct file names in console on update.
//在编译出现错误时，使用 NoEmitOnErrorsPlugin 来跳过输出阶段。这样可以确保输出资源不会包含错误。
new webpack.NoEmitOnErrorsPlugin(),
// https://github.com/ampedandwired/html-webpack-plugin
new HtmlWebpackPlugin({
filename: ‘index.html’,
template: ‘index.html’,
inject: true
}),
// copy custom static assets
new CopyWebpackPlugin([
{
from: path.resolve(__dirname, ‘…/static’),
to: config.dev.assetsSubDirectory,
ignore: [’.’]
}
])
]
})

module.exports = new Promise((resolve, reject) => {
portfinder.basePort = process.env.PORT || config.dev.port
portfinder.getPort((err, port) => {
if (err) {
reject(err)
} else {
// publish the new Port, necessary for e2e tests
process.env.PORT = port
// add port to devServer config
devWebpackConfig.devServer.port = port

  // Add FriendlyErrorsPlugin
  devWebpackConfig.plugins.push(new FriendlyErrorsPlugin({
    compilationSuccessInfo: {
      messages: [`Your application is running here: http://${devWebpackConfig.devServer.host}:${port}`],
    },
    onErrors: config.dev.notifyOnErrors
    ? utils.createNotifierCallback()
    : undefined
  }))

  resolve(devWebpackConfig)
}

})
})