text: 'use strict'
  const path = require('path')
  const utils = require('./utils')
  const webpack = require('webpack')
  const config = require('../config')
  const merge = require('webpack-merge')
  const baseWebpackConfig = require('./webpack.base.conf')
  const CopyWebpackPlugin = require('copy-webpack-plugin')
  const HtmlWebpackPlugin = require('html-webpack-plugin')
  const ExtractTextPlugin = require('extract-text-webpack-plugin')
  const OptimizeCSSPlugin = require('optimize-css-assets-webpack-plugin')
  const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
  const PurgecssPlugin = require('purgecss-webpack-plugin')
  const glob = require('glob-all')
  
  const env = {{#if_or unit e2e}}process.env.NODE_ENV === 'testing'
    ? require('../config/test.env')
    : {{/if_or}}require('../config/prod.env')
  
  const webpackConfig = merge(baseWebpackConfig, {
    module: {
      rules: utils.styleLoaders({
        sourceMap: config.build.productionSourceMap,
        extract: true,
        usePostCSS: true
      })
    },
    devtool: config.build.productionSourceMap ? config.build.devtool : false,
    output: {
      path: config.build.assetsRoot,
      filename: utils.assetsPath('js/[name].[chunkhash].js'),
      chunkFilename: utils.assetsPath('js/[id].[chunkhash].js')
    },
    plugins: [
      // http://vuejs.github.io/vue-loader/en/workflow/production.html
      new webpack.DefinePlugin({
        'process.env': env
      }),
      new UglifyJsPlugin({
        uglifyOptions: {
          compress: {
            warnings: false
          }
        },
        sourceMap: config.build.productionSourceMap,
        parallel: true
      }),
      // extract css into its own file
      new ExtractTextPlugin({
        filename: utils.assetsPath('css/[name].[contenthash].css'),
        // Setting the following option to `false` will not extract CSS from codesplit chunks.
        // Their CSS will instead be inserted dynamically with style-loader when the codesplit chunk has been loaded by webpack.
        // It's currently set to `true` because we are seeing that sourcemaps are included in the codesplit bundle as well when it's `false`,
        // increasing file size: https://github.com/vuejs-templates/webpack/issues/1110
        allChunks: true,
      }),
      // get rid of unused css
      new PurgecssPlugin({
        paths: glob.sync([
          path.join(__dirname, './../src/index.html'),
          path.join(__dirname, './../**/*.vue'),
          path.join(__dirname, './../src/**/*.js'),
          path.join(__dirname, './../**/*.css')
        ])
      }),
      // Compress extracted CSS. We are using this plugin so that possible
      // duplicated CSS from different components can be deduped.
      new OptimizeCSSPlugin({
        cssProcessorOptions: config.build.productionSourceMap
          ? { safe: true, map: { inline: false } }
          : { safe: true }
      }),
      // generate dist index.html with correct asset hash for caching.
      // you can customize output by editing /index.html
      // see https://github.com/ampedandwired/html-webpack-plugin
      new HtmlWebpackPlugin({
        filename: {{#if_or unit e2e}}process.env.NODE_ENV === 'testing'
          ? 'index.html'
          : {{/if_or}}config.build.index,
        template: 'index.html',
        inject: true,
        minify: {
          removeComments: true,
          collapseWhitespace: true,
          removeAttributeQuotes: true
          // more options:
          // https://github.com/kangax/html-minifier#options-quick-reference
        },
        // necessary to consistently work with multiple chunks via CommonsChunkPlugin
        chunksSortMode: 'dependency'
      }),
      // keep module.id stable when vendor modules does not change
      new webpack.HashedModuleIdsPlugin(),
      // enable scope hoisting
      new webpack.optimize.ModuleConcatenationPlugin(),
      // split vendor js into its own file
      new webpack.optimize.CommonsChunkPlugin({
        name: 'vendor',
        minChunks (module) {
          // any required modules inside node_modules are extracted to vendor
          return (
            module.resource &&
            /\.js$/.test(module.resource) &&
            module.resource.indexOf(
              path.join(__dirname, '../node_modules')
            ) === 0
          )
        }
      }),
      // extract webpack runtime and module manifest to its own file in order to
      // prevent vendor hash from being updated whenever app bundle is updated
      new webpack.optimize.CommonsChunkPlugin({
        name: 'manifest',
        minChunks: Infinity
      }),
      // This instance extracts shared chunks from code splitted chunks and bundles them
      // in a separate chunk, similar to the vendor chunk
      // see: https://webpack.js.org/plugins/commons-chunk-plugin/#extra-async-commons-chunk
      new webpack.optimize.CommonsChunkPlugin({
        name: 'app',
        async: 'vendor-async',
        children: true,
        minChunks: 3
      }),
  
      // copy custom static assets
      new CopyWebpackPlugin([
        {
          from: path.resolve(__dirname, '../assets'),
          to: config.build.assetsSubDirectory,
          ignore: ['.*']
        }
      ])
    ]
  })
  
  if (config.build.productionGzip) {
    const CompressionWebpackPlugin = require('compression-webpack-plugin')
  
    webpackConfig.plugins.push(
      new CompressionWebpackPlugin({
        asset: '[path].gz[query]',
        algorithm: 'gzip',
        test: new RegExp(
          '\\.(' +
          config.build.productionGzipExtensions.join('|') +
          ')$'
        ),
        threshold: 10240,
        minRatio: 0.8
      })
    )
  }
  
  if (config.build.bundleAnalyzerReport) {
    const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin
    webpackConfig.plugins.push(new BundleAnalyzerPlugin())
  }
  
  module.exports = webpackConfig
  