npm i compression-asset-by-brotli-webpack-plugin

  var CompressionAssetByBrotliWebpackPlugin = require('compression-asset-by-brotli-webpack-plugin');

  new CompressionAssetByBrotliWebpackPlugin({
      asset: '[path].br[query]',
      test: /\.(js|css|html|svg)$/,
      threshold: 5000,  
      minRatio: 0.8
    })