I am using angular 4.3 (and zone 0.8.12) and I am experiencing some troubles with the official cordova file plugin. The plugin has a patched version of the FileReader class that does not implement the EventTarget interface. If I understand well what it is done by zone.js to "onProperties" (onload,onerror...) is that they are converted to there zone-ready addEventListener(...) counterpart, so my onerror,onload callback never got trigerred...

I understand that it is a plague to implement all singularity of any library, so maybe there should be a more-generic method like zone.runUnpatched(()=>{}) to get the "original"/unpatched constructor of patched API.

suggestion:

For now, if I run this:

zone.run(()=>{
  let reader = new FileReader();
});

new FileReader() it will call zone's delegated constructor that will transform onProperties to addEventListener. reader being a zone-patched instance of FileReader.

Implementing a method like zone.runUnpatched(()=>{}) that will call the actual non-patched constructor would solve that kind of problem :

zone.runUnpatched(()=>{
  let reader = new FileReader();
});