code: function resolveIfPluginHas(optPath, propName, plugin) {
      var opt = plugin.getIn(optPath);
      if (opt.size) {
          return plugin.set(
              propName,
              resolvePluginFiles(opt, plugin.get("relpath"))
          );
      }
      return plugin;
  }
docs: If a plugin contains this option path, resolve/read the files
  @param {Array} optPath - How to access the collection
  @param {String} propName - Key for property access
  @param {Immutable.Map} plugin
  @returns {*}