/* eslint-disable import/no-extraneous-dependencies */

const { HotModuleReplacementPlugin } = require('webpack');
const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer');
const HardSourceWebpackPlugin = require('hard-source-webpack-plugin');
const commonPaths = require('./paths');

module.exports = {
  devtool: 'cheap-eval-source-map',
  output: {
    filename: '[name].js',
    path: commonPaths.outputPath,
    chunkFilename: '[name].js',
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/, // allows both .jsx and .js
        exclude: /node_modules/,
        include: commonPaths.source,
        loader: 'babel-loader',
        options: {
          cacheDirectory: true,
          plugins: ['react-hot-loader/babel'],
        },
      },
      {
        test: /\.(sa|sc|c)ss$/,
        use: [{
          loader: 'style-loader',
        },
        {
          loader: 'css-loader',
          options: {
            modules: false,
          },
        },
        {
          loader: 'sass-loader',
        },
        ],
      },
    ],
  },
  devServer: {
    contentBase: commonPaths.outputPath,
    compress: true,
    hot: true,
    port: 3001,
  },
  plugins: [
    new HotModuleReplacementPlugin(),
    new HardSourceWebpackPlugin({
      // Either an absolute path or relative to webpack's options.context.
      cacheDirectory: commonPaths.cachePath,
      // Either a string of object hash function given a webpack config.
      // node-object-hash on npm can be used to build this.
      configHash: (webpackConfig) => require('node-object-hash')({ // eslint-disable-line
        sort: false,
      }).hash(webpackConfig),
      // Either false, a string, an object, or a project hashing function.
      environmentHash: {
        root: process.cwd(),
        directories: [],
        files: [
          // Cache will get an unique hash based on those files
          // if either of them changes, new cache must be generated
          'package-lock.json',
          '.babelrc.js',
        ],
      },
      info: {
        mode: 'none',
        level: 'debug',
      },
      // Clean up large, old caches automatically.
      cachePrune: {
        // Caches younger than `maxAge` are not considered for deletion.
        // They must be at least this old in milliseconds.
        maxAge: 3 * 60 * 60 * 1000, // 3 hours
        // All caches together must be larger than `sizeThreshold` before any
        // caches will be deleted.
        // Together they must be at least this big in bytes.
        sizeThreshold: 50 * 1024 * 1024, // 50 MB
      },
    }),
    new BundleAnalyzerPlugin({
      analyzerPort: 8888,
      openAnalyzer: false,
    }),
  ],
};