Unable to use expect types without jest types that leads to conflicts with mocha

[mgrybyk]

🐛 Bug Report

I'd like to use expect with other test runner like mocha in TypeScript project.
However I'm not able to import expect types without jest while @types/jest is conflicting with @types/mocha.

To Reproduce

Steps to reproduce the behavior:

1. install @types/mocha
2. install @types/jest (looking for expect only types without jest)
3. add both of them to tsconfig in order to use expect types with mocha runner

Expected behavior

ideally it should be possible to install @types/expect or import only expect types from @types/jest

envinfo

{
  "@types/jest": "^24.0.23",`
  "@types/mocha": "^5.2.7",
}

[cspotcode]

Related: #8570

Although that issue was closed, it's not fixed; I'm still seeing the conflict between "expect" and "@types/mocha".

Here is a reproduction: https://repl.it/repls/LightgreyMustyAutoexec

[SimenB]

@types/jest is not maintained in this repo, but it'll never work to have both @types/jest and @types/mocha as they conflict.

However, the case @cspotcode reports should ideally have worked, as expect comes with its own types. However, expect uses @jest/types which has the Global declaration, meaning it fails. We can probably split out the config types from @jest/types to avoid it. I've been meaning to have a separate jest-config module without all the dependencies anyways - can stick the types in there.

[cspotcode]

@SimenB Can #8570 be re-opened, since it is not fixed and more accurately describes the problem than this issue?

I'm worried this issue will be closed for referring to @types/jest, and then the problem will be forgotten.

[SimenB]

sure

[github-actions]

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