module.exports = (webpackConfig, env) => {
  // FilenameHash
  // https://webpack.js.org/configuration/output/#output-chunkfilename
  webpackConfig.output.chunkFilename = '[name].[hash].js'

  if (env === 'production' && webpackConfig.module) {
    // ClassnameHash
    webpackConfig.module.rules.map((item) => {
      if (item.use && item.use[0] === 'style') {
        return item.use.map((iitem) => {
          if (iitem && iitem.loader === 'css') {
            iitem.options.localIdentName = '[hash:base64:5]'
          }
          return iitem
        })
      }
      return item
    })
  }

  // PreLoaders
  // webpackConfig.module.preLoaders = [{
  //   test: /\.js$/,
  //   enforce: 'pre',
  //   loader: 'eslint',
  // }]

  // Alias
  webpackConfig.resolve.alias = {
    components: `${__dirname}/src/components`,
    utils: `${__dirname}/src/utils`,
    config: `${__dirname}/src/utils/config`,
    enums: `${__dirname}/src/utils/enums`,
  }

  return webpackConfig
}