allow "testEnvironment" to work together with transform/presets

[mysticflute]

🐛 Bug Report

I think this is similar to #5164. In my jest config I have a custom "testEnvironment" that's written in typescript that I want transformed by ts-jest.

To Reproduce

Sample jest config:

module.exports = {
    testEnvironment: './environment.ts',
    globalSetup: './globalSetup.ts',
    globalTeardown: './globalTeardown.ts',
    preset: 'ts-jest',
};

globalSetup and globalTeardown does work, but testEnvironment doesn't:

    (function (exports, require, module, __filename, __dirname) { import NodeEnvironment from 'jest-environment-node';
                                                                         ^^^^^^^^^^^^^^^
    SyntaxError: Unexpected identifier

Expected behavior

the testEnvironment file is transformed.

Link to repl or repo (highly encouraged)

Please provide either a repl.it demo or a minimal repository on GitHub.

Issues without a reproduction link are likely to stall.

Run npx envinfo --preset jest

Paste the results here:

  System:
    OS: macOS 10.14.4
    CPU: (12) x64 Intel(R) Core(TM) i7-8850H CPU @ 2.60GHz
  Binaries:
    Node: 10.15.3 - ~/.nvm/versions/node/v10.15.3/bin/node
    Yarn: 1.16.0 - /usr/local/bin/yarn
    npm: 6.4.1 - ~/.nvm/versions/node/v10.15.3/bin/npm
  npmPackages:
    jest: ^24.7.1 => 24.8.0 

[ChrisLahaye]

Is there any plan to support this?

[xzyfer]

This would address the needs of #2235 which is a real pain point

[SimenB]

Is there any plan to support this?

Sure, PR welcome 🙂

[Mark1626]

Hi, @SimenB can I pick this up?

This should be similar to #7562 right?

Use pirates to override the require in jest-runner and jest-runtime

https://github.com/facebook/jest/blob/cb322d19ade00134d5a16c3be7db0db41766a855/packages/jest-runtime/src/cli/index.ts#L85

https://github.com/facebook/jest/blob/cb322d19ade00134d5a16c3be7db0db41766a855/packages/jest-runner/src/runTest.ts#L107-L109

[SimenB]

Go for it! And yeah, that sounds like the correct way of doing it 🙂

[github-actions]

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