Type conflicts between @types/jest and jest

[villasv]

💬 Questions and Help

I've just realized that the global jest variables in my project are being typed using @types/jest, which is installed as a dependency by ts-jest. On the other hand, I wanted to use the official jest types as they are a bit more up to date with my needs (e.g. beforeAll returning void instead of any).

Is this intended behavior? Or more importantly, can I work around it and make the globals types also come from jest?

[villasv]

Ah, I see this is being caused by #1859. @types/jest was promoted to a real dependency 🤔

If a single function is responsible for pushing @types/jest as a dependency for everyone, maybe that one typing can be copied over to get rid of the hard dependency?

[villasv]

Seems relevant too: jestjs/jest#10118

[ahnpnl]

hmm I thought if types in tsconfig.json doesn't contain jest, the conflict shouldn't be there ?

Actually we already discussed with jest team about moving the mocked function to jest, see jestjs/jest#9534

[villasv]

hmm I thought if types in tsconfig.json doesn't contain jest, the conflict shouldn't be there ?

My types and typeRoots option are unset. Maybe manually listing type roots will help? Not sure, I don't understand a lot about tsconfig.

[ahnpnl]

I think you can override types by specifiying which ones you want to use, also typeRoots can be overridden too

[villasv]

Setting types: ["node"] doesn't help, will try excluding @types/jest from typeRoots.

[villasv]

Well, removing "node_modules/@types" from typeRoots will remove the @types/jest types from my project, but that's not a viable solution because it also gets rid of types for node and other libraries :-/

I don't understand why not listing jest in types didn't work.

[villasv]

Ah, that's because jest-extended also depends on @types/jest :-(

I guess I'm just going to have to live with this conflict then. Since my expect typing has to come from @types/jest for accurate jest-extended types, but my before/after typing has to come from @jest/globals to have accurate return values.