getInheritors(src) {

    return (this.scope ? utils.getMatches(this.scope, src || $tw.wiki.allTitles()) : []);

  }
Get all tiddlers that inherit this type.

@param {Array<TiddlerReference>} [src=$tw.wiki.allTitles()] - A list
    of tiddlers that is searched for inheritors.
@return {Array<TiddlerReference>} The inheritors.