ts-jest changes prototype of error classes

[thitemple]

I'm just testing out ts-jest with our current project which is a mix of JS/TS and we are currently on jest 26.

I have a test like this:

await expect(service.getOne(email).rejects.toThrow(ProfileNotFoundError);

ProfileNotFoundError is a class that extends another class APIError which extends Error.

This test used to work with just jest, but using ts-jest now it fails with the following message:

Expected constructor: ProfileNotFoundError
Received constructor: Error

Am I missing something here? Or is this really an issue?
Thanks

[ahnpnl]

ts-jest doesn't change the prototype of Error classes. That is Jest runtime. ts-jest is a transformer, which only compiles ts to js and that's all.