Type checking in tests with CRA

[aberonni]

Hi, I can't seem to get this to work with CRA. The tests with .ts extension run fine but then if there is a type error (that I see in my IDE or if running tsc) then this is ignored. Is this expected behaviour?

You can see my attempt here: aberonni/ts-jest-CRA-demo@c301cab

[ahnpnl]

IIRC a CRA without ejecting doesn’t accept a custom config for transform Jest option. By default, CRA project always processes TypeScript files with Babel.

I only know that ejecting CRA will allow to configure Jest to use ts-jest instead of Babel. I’m not sure without ejecting you can achieve that.

It’s better to ask this question in Jest Discord community or React community.