I finally had the time to apply the generic Builder and WorkerSupport (extracted from OBJLoader2 to LoaderSupport in release 88) to another loader. I chose PCDLoader as it is not too complex and someone asked me whether a worker based version of it could be created. See the prototype here:
I extracted main parsing functionality into a Parser object which can be used directly or wrapped into a web-worker. LoaderSupport & Builder needed some minor modification, but apart from that the whole concept can be applied to other workers.