Next.js configuration middleware to enable source maps on server chunks

withDebugEnabled.js

function withDebugEnabled(nextConfig) {
  return {
    ...nextConfig,
    webpack(conf, options) {
      // eslint-disable-next-line no-param-reassign
      if (options.isServer) conf.devtool = 'source-map';

      // Overload the Webpack config if it was already overloaded
      if (typeof nextConfig.webpack === 'function') {
        return nextConfig.webpack(conf, options);
      }

      return conf;
    },
  };
}