Since I upgraded to 1.0.1 I'm getting this issue.
The stack trace is not very helpful
Any idea?

I tried on my side and it worked.
Thank you
@rgagnon My project is also impacted : the registerEventHandler is broken.
I tried to hotfix it to create an async method and it works. This error could have been caught with unit tests or flow/typescript...
I confirm works after added async
I'll release a new version tomorrow with the fix. We should definitely automate tests at some point.
Released 1.0.2
Most helpful comment
@rgagnon My project is also impacted : the registerEventHandler is broken.
I tried to hotfix it to create an async method and it works. This error could have been caught with unit tests or flow/typescript...