craco.config.js

const TerserPlugin = require("terser-webpack-plugin")

module.exports = {
  babel: {
    presets: [],
    plugins: ["macros"],
    loaderOptions: (babelLoaderOptions, { env, paths }) => {
      return babelLoaderOptions
    }
  },
  webpack: {
    configure: (webpackConfig) => ({
      ...webpackConfig,
      optimization: {
        ...webpackConfig.optimization,
        minimizer: [
          new TerserPlugin({
            terserOptions: {
              parse: {
                ecma: 8
              },
              compress: {
                ecma: 5,
                warnings: false,
                comparisons: false,
                inline: 2,
                drop_console: true
              },
              mangle: {
                safari10: true
              },
              output: {
                ecma: 5,
                comments: false,
                ascii_only: true
              }
            },
            parallel: 2,
            cache: true,
            sourceMap: true,
            extractComments: false
          })
        ]
      },
      devtool: "source-map"
    })
  }
}