[@types/jest-when] Including jest-when types always adds global jest types

[nickiepucel]

Discussed in #68604

^{Originally posted by nickiepucel February 12, 2024}

The problem

@types/jest-when always adds the global jest types (@types/jest) to the TypeScript global namespace. I believe this is happening here.

This makes importing @types/jest-when incompatible with using @jest/globals/injectGlobals: false because it will result in TypeScript test files compiling when they should not.

Example

Assume I have installed jest-when, @type/jest-when, jest and @jest/globals.

// jest.config.js
module.exports = {
  // ...
  injectGlobals: false
};

// something.test.ts

// import { describe } from "@jest/globals";

// This compiles after I install `@types/jest-when` because it automatically includes `@types/jest`
// It should not compile until I uncomment the above import statement.
describe("Something", () => {});
```</div>