const webpack = require("webpack");
const merge = require("webpack-merge");
const OptimizeCssAssetsPlugin = require("optimize-css-assets-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const UglifyJsPlugin = require("uglifyjs-webpack-plugin");
const common = require("./webpack.common");

module.exports = merge(common, {
  mode: "production",
  devtool: "none",
  output: {
    filename: "[name].[contenthash].min.js",
    chunkFilename: "[id].[name].[contenthash].min.js",
    publicPath: "/dist/",
  },
  module: {
    rules: [
      {
        test: /\.(sa|sc|c)ss$/,
        use: [
          "style-loader",
          MiniCssExtractPlugin.loader,
          "css-loader",
          "postcss-loader",
          "sass-loader",
        ],
      },
    ],
  },
  plugins: [
    // new webpack.optimize.LimitChunkCountPlugin({
    //     maxChunks: 1,
    // }),
    new MiniCssExtractPlugin({
      filename: "[name].[contenthash].min.css",
      chunkFilename: "[name].[contenthash].min.css",
      sourceMap: true,
    }),
    new webpack.HashedModuleIdsPlugin(),
  ],
  optimization: {
    minimizer: [new UglifyJsPlugin(), new OptimizeCssAssetsPlugin()],
    runtimeChunk: "single",
    splitChunks: {
      chunks: "all",
      cacheGroups: {
        vendor: {
          test: /[\\/]node_modules[\\/]/,
          name(module) {
            // get the name. E.g. node_modules/packageName/not/this/part.js
            // or node_modules/packageName
            const packageName = module.context.match(
              /[\\/]node_modules[\\/](.*?)([\\/]|$)/
            )[1];

            // npm package names are URL-safe, but some servers don't like @ symbols
            return `vendor.${packageName.replace("@", "")}`;
          },
        },
      },
    },
  },
});