const path = require('path');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const HtmlWebPackPlugin = require('html-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');

module.exports = {
  mode: process.env.NODE_ENV,
  entry: ['babel-polyfill', './app/index.js'],
  output: {
    path: path.join(__dirname, 'dist'),
    publicPath: '/',
    filename: 'bundle.js',
  },
  devtool: 'inline-source-map',
  devServer: {
    port: 3000,
    historyApiFallback: true,
  },
  module: {
    rules: [
      {
        test: /\.(png|jpe?g|gif)$/i,
        use: [
          {
            loader: 'file-loader',
          },
        ],
      },
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: ['babel-loader', 'eslint-loader'],
      },
      {
        // Preprocess 3rd party .css files located in node_modules
        test: /\.css$/,
        include: /node_modules/,
        use: ['style-loader', 'css-loader'],
      },
      {
        test: /\.less$/,
        use: [
          {
            loader: 'style-loader',
          },
          {
            loader: 'css-loader',
          },
          {
            loader: 'less-loader',
            options: {
              javascriptEnabled: true,
            },
          },
        ],
      },
      {
        test: /\.(css|scss)$/,
        exclude: /node_modules/,
        use: [
          {
            loader: 'style-loader',
          },
          {
            loader: 'css-loader',
            options: {
              modules: {
                localIdentName: '[name]__[local]___[hash:base64:5]',
              },
              sourceMap: true,
            },
          },
          {
            loader: 'sass-loader',
          },
        ],
      },
    ],
  },
  optimization: {
    minimizer: [new UglifyJsPlugin()],
  },
  resolve: {
    modules: ['node_modules', path.resolve(`${__dirname}/app`)],
    alias: {
      app: path.resolve(`${__dirname}/app`),
    },
  },
  plugins: [
    new CleanWebpackPlugin(),
    new HtmlWebPackPlugin({
      inject: true,
      template: './app/index.html',
      filename: './index.html',
    }),
  ],
};