code: function overrideWebpack({ plugin, options }, cracoConfig, webpackConfig, context) {
      if (isFunction(plugin.overrideWebpackConfig)) {
          const resultingConfig = plugin.overrideWebpackConfig({
              cracoConfig: cracoConfig,
              webpackConfig: webpackConfig,
              pluginOptions: options,
              context: context
          });
  
          if (!resultingConfig) {
              throw new Error("craco: Plugin returned an undefined webpack config.");
          }
      }
  
      log("Overrided webpack config with plugin.");
  
      return webpackConfig;
  }
docs: **********  Webpack Config  ******************