const path = require('path');
const webpack = require('webpack');
const VueLoaderPlugin = require('vue-loader/lib/plugin');

/*
 * SplitChunksPlugin is enabled by default and replaced
 * deprecated CommonsChunkPlugin. It automatically identifies modules which
 * should be splitted of chunk by heuristics using module duplication count and
 * module category (i. e. node_modules). And splits the chunks…
 *
 * It is safe to remove "splitChunks" from the generated configuration
 * and was added as an educational example.
 *
 * https://webpack.js.org/plugins/split-chunks-plugin/
 *
 */

const HtmlWebpackPlugin = require('html-webpack-plugin');

/*
 * We've enabled HtmlWebpackPlugin for you! This generates a html
 * page for you when you compile webpack, which will make you start
 * developing and prototyping faster.
 *
 * https://github.com/jantimon/html-webpack-plugin
 *
 */

module.exports = {
  mode: 'development',
  entry: path.resolve(__dirname, 'src/index.js'),

  output: {
    filename: '[name].[chunkhash].js',
    path: path.resolve(__dirname, 'dist')
  },

  plugins: [
    new webpack.ProgressPlugin(),
    new HtmlWebpackPlugin({
      template: path.resolve(__dirname, 'src/index.html'),
    }),
    new VueLoaderPlugin(),
  ],

  module: {
    rules: [
      {
        test: /\.vue$/,
        exclude: /node_modules/,
        loader: 'vue-loader',
        options: {
          loaders: {
            'scss': 'vue-style-loader!css-loader!sass-loader',
          },
        },
      },
      {
        test: /\.scss$/,
        use: [
          'style-loader',
          'css-loader',
          'sass-loader'
        ]
      },
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
      },
      {
        test: /\.css$/,
        use: [
          'vue-style-loader',
          'css-loader'
        ]
      },
    ]
  },

  resolve: {
    extensions: ['.js', '.vue', '.json'],
    alias: {
      'vue$': 'vue/dist/vue.esm.js',
    },
  },

  devtool: '#eval-source-map',

  optimization: {
    splitChunks: {
      cacheGroups: {
        vendors: {
          priority: -10,
          test: /[\\/]node_modules[\\/]/
        }
      },

      chunks: 'async',
      minChunks: 1,
      minSize: 30000,
      name: true
    }
  },

  devServer: {
    open: true
  }
};