const HtmlWebpackPlugin = require('html-webpack-plugin')
const { FilerWebpackPlugin } = require('filer/webpack')
const NodePolyfillPlugin = require('node-polyfill-webpack-plugin')
const webpack = require('webpack')

const path = require('path')

module.exports = {
  entry: {
    flow: './src/index.ts'
  },
  devtool: 'inline-source-map',
  mode: 'production',
  module: {
    rules: [
      {
        test: /\.less$/i,
        use: [
          'style-loader',
          'css-loader',
          'less-loader'
        ]
      },
      {
        test: /\.css$/i,
        use: [
          'style-loader',
          'css-loader'
        ]
      },
      {
        test: /\.(png|jpe?g|gif)$/i,
        loader: 'file-loader',
        options: {
          outputPath: 'images'
        }
      },
      {
        test: /\.ts$/,
        exclude: /node_modules/,
        use: 'babel-loader'
      },
      {
        test: /\.js$/,
        use: ['source-map-loader'],
        enforce: 'pre'
      }

    ]
  },
  resolve: {
    extensions: ['.tsx', '.ts', '.js']
  },
  output: {
    filename: '[name].bundle.js',
    path: path.resolve(__dirname, 'dist'),
    clean: true
  },
  devServer: {
    static: {
      directory: path.join(__dirname, 'dist')
    },
    compress: true,
    port: 9000
  },
  plugins: [new HtmlWebpackPlugin(), new FilerWebpackPlugin(),
    new NodePolyfillPlugin({
      excludeAliases: ['console']
    }),
    new webpack.optimize.MinChunkSizePlugin({
      minChunkSize: 50000
    }),
    new webpack.optimize.SplitChunksPlugin({
      minSize: 45000,
      maxSize: 110000
    })
  ],
  optimization: {
    splitChunks: {
      chunks: 'async',
      minSize: 20000,
      minRemainingSize: 0,
      minChunks: 1,
      maxAsyncRequests: 30,
      maxInitialRequests: 30,
      enforceSizeThreshold: 50000,
      cacheGroups: {
        commons: {
          test: /[\\/]node_modules[\\/]/,
          name: 'vendor',
          chunks: 'initial',
          reuseExistingChunk: true
        },
        default: {
          minChunks: 2,
          reuseExistingChunk: true
        }
      }
    }
  }
}