const path = require('path')
const webpack = require('webpack')
const { CleanWebpackPlugin } = require('clean-webpack-plugin')
const nodeExternals = require('webpack-node-externals')
const ForkTsCheckerWebpackPlugin = require('fork-ts-checker-webpack-plugin')

console.log(nodeExternals())

module.exports = {
  mode: 'production',
  // entry: {
  //   index: './src/index.ts',
  //   abstract: './src/abstract.ts',
  //   animal: './src/animal.ts'
  // },
  entry: './src',
  output: {
    // filename: '[name].js',
    path: path.resolve(__dirname, 'dist'),

    library: '[name]',
    libraryTarget: 'umd'
  },
  target: 'node',
  // externalsPresets: { node: true },
  // externals: [nodeExternals()],
  resolve: {
    extensions: ['.ts', '.tsx', '.js']
  },
  module: {
    rules: [
      {
        test: /\.tsx?$/, use: [{
          loader: 'tslint-loader',
          options: {
            configFile: path.resolve(__dirname, 'tslint.json'),
          }
        }]
      },
      {
        test: /\.tsx?$/, use: [
          // { loader: 'babel-loader' }
          {
            loader: 'ts-loader',
            options: {
              transpileOnly: true,
              configFile: path.resolve(__dirname, 'tsconfig.json'),
            },
          },
        ]
      }
    ]
  },

  optimization: {
    minimize: true,
    splitChunks: {
      cacheGroups: {
        commons: {
          chunks: 'initial',
          minChunks: 2,
          maxInitialRequests: 5,
          minSize: 0
        },
        vendor: {
          test: /node_modules/,
          chunks: 'initial',
          name: 'vendor',
          priority: 10,
          enforce: true
        }
      }
    }
  },
  plugins: [
    new CleanWebpackPlugin({ cleanOnceBeforeBuildPatterns: ['./dist'] }),
    new webpack.ProgressPlugin(),
    new ForkTsCheckerWebpackPlugin(),
  ],
}