const path = require('path');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');

const extractSass = new ExtractTextPlugin({
  filename: 'bundle.[contenthash].css',
});

module.exports = {
  entry: [
    '@babel/polyfill',
    'whatwg-fetch',
    './src/js/index.js',
  ],
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'bundle.[chunkhash].js',
    publicPath: '/',
  },
  resolve: {
    modules: [
      path.resolve('./src/js'),
      path.resolve('./node_modules'),
    ],
  },
  module: {
    loaders: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: [
          {
            loader: 'babel-loader',
            options: {
              cacheDirectory: true,
            },
          },
        ],
      },
      {
        test: /\.html$/,
        loader: 'html-loader',
      },
      {
        test: /\.sass$/,
        loader: extractSass.extract({
          use: ['css-loader', 'sass-loader'],
        }),
      },
    ],
  },
  plugins: [
    new CleanWebpackPlugin(['dist']),
    extractSass,
    new HtmlWebpackPlugin({
      template: 'src/index.html',
    }),
    new CopyWebpackPlugin([
      {
        from: 'src/404.html',
        to: '404.html',
      },
      {
        from: 'src/images',
        to: 'images/',
      },
    ]),
  ],
  stats: {
    colors: true,
  },
}