code: function requirePlugin(item) {
      /**
       * if the "module" property already exists and
       * is not a string, then we bail and don't bother looking
       * for the file
       */
      if (item.get("module") && typeof item.get("module") !== "string") {
          return item;
      }
  
      try {
          /**
           * Try a raw node require() call - this will be how
           * regular "npm installed" plugins wil work
           */
          var maybe = require.resolve(item.get("name"));
          return item.set("module", require(maybe));
      } catch (e) {
          /**
           * If require threw an MODULE_NOT_FOUND error, try again
           * by resolving from cwd. This is needed since cli
           * users will not add ./ to the front of a path (which
           * node requires to resolve from cwd)
           */
          if (e.code === "MODULE_NOT_FOUND") {
              var maybe = path.resolve(process.cwd(), item.get("name"));
              if (fs.existsSync(maybe)) {
                  return item.set("module", require(maybe));
              } else {
                  /**
                   * Finally return a plugin that contains the error
                   * this will be picked up later and discarded
                   */
                  return item.update("errors", function(errors) {
                      return errors.concat(e);
                  });
              }
          }
          throw e;
      }
  }
docs: Load a plugin from disk
  @param item
  @returns {*}