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fix(jest-config): correctly detect CI environment and update snapshots accordingly #12378

merged 10 commits into from Feb 13, 2022


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@cola119 cola119 commented Feb 12, 2022

Fixed #12288


The cause of this problem is that the current implementation for determining option.updateSnapshot does not take into account process.env.CI. We can know the value of process.env.CI in

Test plan

This PR added test cases for option.updateSnapshot and also fixed type issues by as assertions.

to determine option.updateSnapshot
@cola119 cola119 requested a review from SimenB Feb 13, 2022
@@ -1131,8 +1131,12 @@ export default async function normalize(
newOptions.moduleNameMapper = [];

if ( != null) { =;
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@SimenB SimenB Feb 13, 2022

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newOptions already has the default checking the env var in it, so this only overrides that if argv has a value

SimenB approved these changes Feb 13, 2022
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codecov-commenter commented Feb 13, 2022

Codecov Report

Merging #12378 (ab6db25) into main (faef0b4) will increase coverage by 0.01%.
The diff coverage is 100.00%.

Impacted file tree graph

@@            Coverage Diff             @@
##             main   #12378      +/-   ##
+ Coverage   68.47%   68.48%   +0.01%     
  Files         324      324              
  Lines       16967    16969       +2     
  Branches     5060     5061       +1     
+ Hits        11618    11622       +4     
+ Misses       5317     5315       -2     
  Partials       32       32              
Impacted Files Coverage Δ
packages/jest-config/src/index.ts 20.73% <ø> (ø)
packages/test-utils/src/config.ts 0.00% <ø> (ø)
packages/jest-config/src/normalize.ts 88.86% <100.00%> (+0.40%) ⬆️

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@SimenB SimenB changed the title fix(jest-config): use the value of process.env.CI to determine option.updateSnapshot fix(jest-config): correctly detect CI environment and update snapshots accordingly Feb 13, 2022
@SimenB SimenB merged commit 4305088 into facebook:main Feb 13, 2022
21 of 26 checks passed
@cola119 cola119 deleted the issue-12288 branch Feb 14, 2022

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Successfully merging this pull request may close these issues.

[Bug]: Jest incorrectly writes new snapshots in CI
5 participants