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feat(jest-config): add support for preset written in ESM #11200

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merged 1 commit into from Mar 15, 2021
Merged

feat(jest-config): add support for preset written in ESM #11200

merged 1 commit into from Mar 15, 2021

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ahnpnl
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@ahnpnl ahnpnl commented Mar 14, 2021

Summary

Related to #11167

  • Add .cjs, .mjs to the supported extensions for preset as well as logic to load them, with .mjs for ESM preset and .cjs for CommonJS preset
  • Clean up some unused mocks in normalize.test.ts as well as fix some ts type errors.

Test plan

Added unit tests for happy path
Added e2e tests

@ahnpnl
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ahnpnl commented Mar 14, 2021

I could only make unit test for happy path. I couldn't make unit test for validating these cases

  • Throw error if.mjs preset contains module.exports
// jest-preset.mjs
module.exports = {
}
  • Throw error if .js preset containsexport default
// jest-preset.js
export default {
}

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Codecov Report

Merging #11200 (00ffa95) into master (33c3b07) will decrease coverage by 0.02%.
The diff coverage is 30.00%.

Impacted file tree graph

@@            Coverage Diff             @@
##           master   #11200      +/-   ##
==========================================
- Coverage   64.29%   64.26%   -0.03%     
==========================================
  Files         308      308              
  Lines       13484    13490       +6     
  Branches     3287     3288       +1     
==========================================
+ Hits         8669     8670       +1     
- Misses       4106     4111       +5     
  Partials      709      709              
Impacted Files Coverage Δ
packages/jest-config/src/normalize.ts 76.74% <30.00%> (-1.21%) ⬇️
packages/jest-config/src/utils.ts 77.58% <0.00%> (+1.72%) ⬆️

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@SimenB
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SimenB commented Mar 15, 2021

  • Throw error if .js preset containsexport default

that's valid if package.json has type: 'module'

@ahnpnl
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ahnpnl commented Mar 15, 2021

  • Throw error if .js preset containsexport default

that's valid if package.json has type: 'module'

Thanks !, I've added this case to e2e, not sure how to make it with unit tests.

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thanks!

e2e/__tests__/presets.test.ts Outdated Show resolved Hide resolved
e2e/__tests__/presets.test.ts Outdated Show resolved Hide resolved
@ahnpnl ahnpnl marked this pull request as ready for review March 15, 2021 13:16
@SimenB SimenB merged commit 75e94cc into jestjs:master Mar 15, 2021
@ahnpnl ahnpnl deleted the preset-esm branch March 15, 2021 14:10
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SimenB commented Mar 25, 2021

@ahnpnl running yarn clean-all will delete the stuff from node_modules added for the tests here. Would you be able to take a look? 🙂

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ahnpnl commented Mar 25, 2021

Sure!

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4 participants