jest.Global incorrectly extends interface 'NodeJS.Global'?

Hello dear Jest fellows, i’ve been doing some maintenance stuff in stryker-mutator and came into this error:

packages/jest-runner/node_modules/@jest/types/build/Global.d.ts:54:18 - error TS2430: Interface 'import("/home/travis/build/stryker-mutator/stryker/packages/jest-runner/node_modules/@jest/types/build/Global").Global' incorrectly extends interface 'NodeJS.Global'.
  Types of property 'describe' are incompatible.
    Type 'Describe' is not assignable to type 'SuiteFunction'.
      Types of property 'only' are incompatible.
        Type 'DescribeBase' is not assignable to type 'ExclusiveSuiteFunction'.
          Type 'void' is not assignable to type 'Suite'.
54 export interface Global extends NodeJS.Global {

We don’t get any other error related to that so I am not sure why is it occurring (all i have done is to change dependencies from jest: ^24.9.0 to ~24.9)

Do you have any idea why it happened?

link to a PR: https://github.com/stryker-mutator/stryker/pull/1706 link to a one of travis jobs: https://travis-ci.org/stryker-mutator/stryker/jobs/582083380

[codeviking]

We ran into this recently. Ultimately it was because:

• We were using mocha as a test runner.
• We added expect, which depends on @jest.
• @jest defines describe, here: https://github.com/facebook/jest/blob/master/packages/jest-types/src/Global.ts#L76
• @types/mocha defines describe as well, here: https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/mocha/index.d.ts#L598
• The two describes aren’t compatible, so TypeScript ends up being unhappy.

Our solution was to replace expect with chai, as it doesn’t depend upon @jest. We could’ve also likely replaced mocha with jest, but that felt like a larger effort.

[drudv]

I had a similar issue because there was another node_modules folder on top of my project’s folder. The errors disappeared, when I removed those node_modules.