var path = require( 'path' );
var webpack = require( 'webpack' );
var CleanWebpackPlugin = require( 'clean-webpack-plugin' );
var CopyWebpackPlugin = require( 'copy-webpack-plugin' );
var HtmlWebpackPlugin = require( 'html-webpack-plugin' );
var WebkitPrefixer = require( 'autoprefixer' );
var WebpackMd5Hash = require( 'webpack-md5-hash' );
var BundleAnalyzerPlugin = require( 'webpack-bundle-analyzer' ).BundleAnalyzerPlugin;

var sourcedir = path.resolve( __dirname,'src' );// 源码和资源文件的放置位置
var outputdir = path.resolve( __dirname,'build' );// 编译结果的放置位置
var webContextRoot = '/myreact/';// 应用的实际访问路径，默认是'/'
// antd的图标字体文件的实际访问路径，利用less-load的变量替换功能
var antd_fonticon = webContextRoot + 'assets/antd_fonticon/iconfont';

var hasValue = function( item ) { return item != null; };
return {
//context: path.resolve( __dirname ),devtool: 'source-map',devServer: {
host: '0.0.0.0',port: 8082,historyApiFallback: true
},resolve: {
// 让less-loader等插件能找到以~相对定位的资源
modules: [sourcedir,'node_modules']
},entry: {
main: [
// 编译新版本js的新api(如Promise)，主要是让IE11能够执行编译后的代码
'babel-polyfill',//使用react-hot-loader@3.0.0-beta.6，
// 搭配webpack-dev-server --hot命令实现react组件的hot reload
isDev ? 'react-hot-loader/patch' : null,path.resolve( sourcedir,'main.jsx' )].filter( hasValue ),// 第三方库汇总输出
vendor: ['bootstrap/dist/css/bootstrap.min.css','react','react-dom','react-router','redux','react-redux','react-router-redux','moment','lodash','immutable','whatwg-fetch',// 只含antd的js部分
'antd',// 各控件还需引入各自的样式文件
'antd/lib/style/index.less']
},output: {
path: outputdir,filename: isDev ? 'js/[name].js' : 'js/[name]_[chunkhash:8].js',// 使用require.ensure造成的延迟加载的代码文件
chunkFilename: isDev ? 'js/chunk[id][name].js'
: 'js/chunk[name][chunkhash:8].js',publicPath: webContextRoot
},module: {
rules: [{
test: /.jsx?$/,exclude: /(node_modules|bower_components)/,use: [{
// 编译新版本js语法为低版本js语法
loader: 'babel-loader',options: {
presets: [
// 编译es2015版本的js
['babel-preset-es2015',{
modules: false
}],'babel-preset-stage-2',// 编译jsx
'babel-preset-react'],plugins: [// 支持热加载react组件
isDev ? 'react-hot-loader/babel' : null,// 减少重复的编译后的辅助方法
'babel-plugin-transform-runtime',// 按需加载组件的代码和样式
['babel-plugin-import',{
libraryName: 'antd',style: true
}]].filter( hasValue )
}
}]
},{
test: /.css$/,use: ['style-loader',{
loader: 'css-loader',options: {
// 第三方组件未以module方式引入css，所以不能在全局开启css module
modules: false
}
},{ loader: 'postcss-loader',options: { plugins: [WebkitPrefixer] } }]
},{
test: /.less$/,options: {
modules: false
}
},options: { plugins: [WebkitPrefixer] } },{
loader: 'less-loader',options: {
modules: false,modifyVars: {
// 替换antd用到的字体文件路径
"icon-url": JSON.stringify( antd_fonticon )
}
}
}]
},{
test: /.(jpg|png|gif)$/,use: {
loader: 'url-loader',options: {
// 编码为dataUrl的最大尺寸
limit: 10000,// 输出路径，相对于publicPath
outputPath: 'assets/',name: isDev ? '[name].[ext]' : '[name]_[hash:8].[ext]'
}
}

  },{
    test: /\.(woff|woff2)(\?v=\d+\.\d+\.\d+)?$/,options: {
        limit: 10000,mimetype: 'application/font-woff',outputPath: 'assets/',name: isDev ? '[name].[ext]' : '[name]_[hash:8].[ext]'
      }
    }
  },{
    test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/,mimetype: 'application/octet-stream',{
    test: /\.eot(\?v=\d+\.\d+\.\d+)?$/,mimetype: 'application/vnd.ms-fontobject',{
    test: /\.svg(\?v=\d+\.\d+\.\d+)?$/,mimetype: 'application/svg+xml',name: isDev ? '[name].[ext]' : '[name]_[hash:8].[ext]'
      }
    }
  }]
},plugins: [
  // momentjs包含大量本地化<a href="/tag/daima/" target="_blank" class="keywords">代码</a>，需筛选
  new webpack.ContextReplacementPlugin( /moment[\/\\]locale$/,/en-ca|zh-cn/ ),new webpack.optimize.OccurrenceOrderPlugin( true ),// 复制无需编译的<a href="/tag/wenjian/" target="_blank" class="keywords">文件</a>至<a href="/tag/shuchu/" target="_blank" class="keywords">输出</a>目录
  new CopyWebpackPlugin( [{
    from: path.resolve( sourcedir,'assets' ),to: 'assets'
  }] ),// 修复webpack的chunkhash不以chunk<a href="/tag/wenjian/" target="_blank" class="keywords">文件</a>实际<a href="/tag/neirong/" target="_blank" class="keywords">内容</a>为准的问题
  new WebpackMd5Hash(),// 单独打包<a href="/tag/shuchu/" target="_blank" class="keywords">输出</a>第三方组件，和webpack<a href="/tag/shengcheng/" target="_blank" class="keywords">生成</a>的运行时<a href="/tag/daima/" target="_blank" class="keywords">代码</a>
  new webpack.optimize.CommonsChunkPlugin( {
    name: ['vendor','manifest']
  }),// <a href="/tag/zidong/" target="_blank" class="keywords">自动</a>填充js、css引用进<a href="/tag/shouye/" target="_blank" class="keywords">首页</a>
  new HtmlWebpackPlugin( {
    title: 'wzp react',template: path.resolve( sourcedir,'index.html' ),inject: 'body' // Inject all scripts into the body
  }),// 设置环境变量
  new webpack.DefinePlugin( {
    process: {
      env: {
        // process.env.NODE_ENV==="production"
        // 应用<a href="/tag/daima/" target="_blank" class="keywords">代码</a>里，可凭此判断是否运行在生产环境
        NODE_ENV: isDev ? JSON.stringify( 'development' )
          : JSON.stringify( 'production' )
      }
    }
  }),// print more readable module names on HMR updates
  isDev ? new webpack.NamedModulesPlugin() : null,// 先清理<a href="/tag/shuchu/" target="_blank" class="keywords">输出</a>目录
  isDev ? null : new CleanWebpackPlugin( [outputdir] ),// 排除特定库
  isDev ? null : new webpack.IgnorePlugin( /.*/,/react-hot-loader$/ ),// <a href="/tag/shuchu/" target="_blank" class="keywords">输出</a>报告，查看第三方库的大小
  isDev ? null : new BundleAnalyzerPlugin(
    {
      analyzerMode: 'static',reportFilename: 'report.html',openAnalyzer: true,generateStatsFile: false
    })
].filter( hasValue )

}
};