const webpack = require('webpack');
const path = require('path');
const glob = require('glob');
const { exec } = require('child_process');
const ForkTsCheckerWebpackPlugin = require('fork-ts-checker-webpack-plugin');
const TsconfigPathsPlugin = require('tsconfig-paths-webpack-plugin');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
const LodashModuleReplacementPlugin = require('lodash-webpack-plugin');
const TerserPlugin = require('terser-webpack-plugin');
const Dotenv = require('dotenv-webpack');
const dotenv = require('dotenv');
const { format } = require('date-fns');

const basePath = path.resolve('src', 'apps');

const env = dotenv.config().parsed

// basePath配下の各ディレクトリを複数のentryとする
const entries = glob.sync('*/index.+(js|ts|tsx)', { cwd: basePath }).reduce(
  (prev, file) => ({
    ...prev,
    [path.dirname(file)]: path.resolve(basePath, file),
  }),
  {}
);

module.exports = {
  optimization: {
    minimize: true,
    minimizer: [new TerserPlugin()],
  },
  entry: entries,
  cache: false,
  resolve: {
    // 拡張子を配列で指定
    extensions: [
      '.ts', '.js',
    ],
    plugins: [
      new TsconfigPathsPlugin({
        configFile: './tsconfig.json',
      }),
    ]
  },
  module: {
    rules: [
      {
        test: /\.m?js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: [
              [
                '@babel/preset-env',
                {
                  useBuiltIns: 'usage',
                  corejs: 3,
                },
              ],
            ],
          },
        },
      },
      {
        test: /\.tsx?$/,
        use: 'ts-loader',
      }
    ],
  },
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: '[name].js',
  },
  plugins: [
    // new Dotenv({ systemvars: true }),
    new ForkTsCheckerWebpackPlugin(),
    // new BundleAnalyzerPlugin(),
    new LodashModuleReplacementPlugin(),
    new webpack.DefinePlugin({
      'process.env.BUILD_TIME': JSON.stringify(format(new Date(), 'yyyy-MM-dd HH:mm:ss')),
    }),
  ],
};