code: function normalizeFeatureItem(item, existed, result, logger) {
      let addItem;
      if (typeof item === 'string') {
          addItem = addFeatureItem(logger, existed, item);
      }
      else if (Array.isArray(item)) {
          let [name, params] = item;
          addItem = addFeatureItem(logger, existed, name, params);
      }
      else if (item && typeof item === 'object') {
          let {name, params} = item;
          addItem = addFeatureItem(logger, existed, name, params);
      }
  
      if (addItem) {
          result.push(addItem);
      }
  }
docs: Normalize API feature item
  
  @inner
  @param {*} item the feature item to normalize
  @param {Object} existed the added feature item map
  @param {Array.<Object>} result the normalized feature items result
  @param {Object} logger logger the logger utilities