code: function (committingEventTransformer) {
      if (!committingEventTransformer || !_.isObject(committingEventTransformer)) {
        var err = new Error('Please inject a valid committingEventTransformer object!');
        debug(err);
        throw err;
      }
  
      if (this.committingEventTransformers.indexOf(committingEventTransformer) < 0) {
        this.committingEventTransformers.push(committingEventTransformer);
      }
    }
docs: Add committingEventTransformer module.
  @param {CommittingEventTransformer} committingEventTransformer The committingEventTransformer module to be injected.