text: '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')
  const HtmlWebpackPlugin = require('html-webpack-plugin')
  const FriendlyErrorsPlugin = require('friendly-errors-webpack-plugin')
  const portfinder = require('portfinder')
  const HtmlBefInjectPlugin = require('../plugins/html.bef.inject')
  
  const HOST = process.env.HOST
  const PORT = process.env.PORT && Number(process.env.PORT)
  
  const devWebpackConfig = merge(baseWebpackConfig, {
    module: {
      rules: utils.styleLoaders({ sourceMap: config.dev.cssSourceMap, usePostCSS: true })
    },
    // cheap-module-eval-source-map is faster for development
    devtool: config.dev.devtool,
    output: {
      publicPath: config.dev.assetsPublicPath
    },
    // 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')},
          { from: /.*/, to: path.posix.join(config.dev.assetsPublicPath, 'views/404.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,
      }
    },
    plugins: [
      new HtmlBefInjectPlugin({
        paths: ['static/common.js']
      }),
      new webpack.DefinePlugin({
        'process.env': require('../config/dev.env')
      }),
      new webpack.HotModuleReplacementPlugin(),
      new webpack.NamedModulesPlugin(), // HMR shows correct file names in console on update.
      new webpack.NoEmitOnErrorsPlugin(),
      // copy custom static assets
      new CopyWebpackPlugin([
        {
          from: path.resolve(__dirname, '../static'),
          to: config.dev.assetsSubDirectory,
          ignore: ['.*']
        }
      ])
    ]
  })
  
  const pages = utils.getEntry(['./src/views/**/*.html','./src/index.html'])
  
  for (let pathname in pages) {
    let conf = {
      filename: pathname + '.html',
      template: pages[pathname],
      inject: true,
      // necessary to consistently work with multiple chunks via CommonsChunkPlugin
      chunksSortMode: 'dependency'
    }
    if (pathname in devWebpackConfig.entry) {
      conf.chunks = ['manifest', 'vendor', pathname]
      conf.hash = true
    }
    devWebpackConfig.plugins.push(new HtmlWebpackPlugin(conf))
  }
  
  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)
      }
    })
  })
  