code: function(file, event) {
      var fn = function(file) {};
      for(var i = 0; i < watchList.length; i++) {
          if(watchList[i].file === file) {
              watchers[i].on(event, fn);
              watchList[i].callback[event] = fn;
              return;
          }
      }
      throw new Error(file + " was not being watched previously");
  }
docs: **deleteTrigger**  Remove the trigger for an event from a watcher  _Parameters:_  * `file`: The file whose trigger is to be removed * `event`: The event whose trigger is to be removed  _Throws:_  * `Error`: If the file is not being watched already