Cannot find type definition file for 'jest'

[kraenhansen]

Description

In a very minimal package declaring a dependency on react-native and the @react-native/typescript-config (such as a very simple library), extending the @react-native/typescript-config yields:

error TS2688: Cannot find type definition file for 'jest'.
  The file is in the program because:
    Entry point of type library 'jest' specified in compilerOptions

This happens because the tsconfig declares "types": ["jest"], while neither "react-native" nor "@react-native/typescript-config" declare a dependency on neither jest nor @types/jest.

I'd suggest moving the "types": ["jest"], to the template's tsconfig: https://github.com/react-native-community/template/blob/d2a0bee199b49611ee252dd5d7626f10a714bebd/template/tsconfig.json#L2 since that's the package bringing the jest dependency.

Steps to reproduce

Init a new package with this package.json

{
  "name": "react-native-ts-test",
  "private": true,
  "version": "0.1.0",
  "scripts": {
    "build": "tsc --noEmit"
  },
  "devDependencies": {
    "@react-native/typescript-config": "^0.81.1",
    "typescript": "^5.9.2"
  },
  "dependencies": {
    "react-native": "^0.81.1"
  }
}

and this tsconfig.json

{
  "extends": "@react-native/typescript-config",
  "include": ["src/index.ts"]
}

Run npx tsc --noEmit 💥

error TS2688: Cannot find type definition file for 'jest'.
  The file is in the program because:
    Entry point of type library 'jest' specified in compilerOptions

React Native Version

0.81.1

Affected Platforms

Build - MacOS, Build - Windows, Build - Linux

Output of npx @react-native-community/cli info

N/A

Stacktrace or Logs

error TS2688: Cannot find type definition file for 'jest'.
  The file is in the program because:
    Entry point of type library 'jest' specified in compilerOptions

MANDATORY Reproducer

https://github.com/react-native-community/reproducer-react-native

Screenshots and Videos

[react-native-bot]

Warning

Missing reproducer: We could not detect a reproducible example in your issue report. Reproducers are mandatory and we can accept only one of those as a valid reproducer:

• For majority of bugs: send us a Pull Request with the RNTesterPlayground.js edited to reproduce your bug.
• If your bug is UI related: a Snack
• If your bug is build/upgrade related: a project using our Reproducer Template

You can read more about about it on our website: How to report a bug.

[atulgpt17]

Hi, I am able to repro this issue with the steps mentioned above

[cortinico]

I'd suggest moving the "types": ["jest"], to the template's tsconfig: react-native-community/template@d2a0bee/template/tsconfig.json#L2 since that's the package bringing the jest dependency.

Yup this feels like a good way forward. Are you up for sending a PR here?
Also cc @robhogan for visibility

[kraenhansen]

Here's a PR making the use of jest explicit in the template: react-native-community/template#177

And here's a PR (in draft) to remove it from @react-native/typescript-config: #53855