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feat: allow test environment to run with preset/transform #8751

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merged 4 commits into from Nov 15, 2020

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Mark1626
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Summary

Fixes #8479. The exact same approach as #7562.

  • Using the Runtime create an instance of Transformer
  • Hijack the require and perform the transform
  • Remove the hook on require

As of now the logic for the transformation is repeated across jest-cli, jest-runner, jest-runtime packages. Can you give me some inputs on whether it can be extracted to a single location?

Test plan

Existing test cases should not be affected by the change, an additional test where the environment needs to be transformed to pass is added.

@SimenB
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SimenB commented Jul 25, 2019

Can you give me some inputs on whether it can be extracted to a single location?

Hmm, maybe we could stick some abstraction for this into @jest/transform? E.g. requireAndTranspileModule<T extends string>(moduleName: T, config: Config.ProjectConfig): typeof import(T) which sets up pirates and the transform, requires the module, and cleans up? This is off the top of my head, but do you think that'd work?

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Code itself LGTM! Would love to reduce the code duplication as discussed

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SimenB commented Jul 25, 2019

Don't worry about the OOM for circus on CI btw - it's not your fault

@jeysal jeysal added this to the Jest 25 milestone Jul 26, 2019
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Code LGTM as well, left a few comments in addition to what Simen said.

e2e/__tests__/transform.test.ts Show resolved Hide resolved
*/

it('should add two numbers', () => {
expect(1 + 1).toBe(2);
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Maybe we should use something from the env here just to be sure that it was properly loaded

e2e/transform-linked-modules/package.json Show resolved Hide resolved
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Oops, forgot to submit

packages/jest-transform/src/ScriptTransformer.ts Outdated Show resolved Hide resolved
packages/jest-runtime/package.json Outdated Show resolved Hide resolved
packages/jest-core/src/runGlobalHook.ts Outdated Show resolved Hide resolved
packages/jest-core/src/runGlobalHook.ts Outdated Show resolved Hide resolved
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This LGTM, needs to wait for us to start merging breaking changes

@Mark1626
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@SimenB @jeysal Thanks for your patient reviews, learnt a lot from this PR

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@SimenB Why did the roadmap change from Jest26 to High priority future if the PR is good to go?

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SimenB commented May 20, 2020

Feedback from FB that this was potentially very breaking. Code wise still good to go, I'll sync with peeps at FB to make sure we can land it in 27 🙂

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michaelgmcd commented Sep 25, 2020

Hey @SimenB, any update on this? Just want to confirm it's on track for v27.

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SimenB commented Sep 27, 2020

It is 👍

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@SimenB I rebased it, I had to squash the commits into a single commit to simplify the merge conflict

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zzarcon commented Mar 24, 2021

Thanks so much for this change folks! Do you know in which version will this be available? thanks!

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SimenB commented Mar 24, 2021

You can install jest@next to use it now. It'll be available in Jest 27 whenever it stabilizes (possibly over Easter holidays)

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allow "testEnvironment" to work together with transform/presets