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@SimenB SimenB commented Mar 20, 2021

Summary

The code currently ends up putting duplicate modules into the module cache, leading to different instances added to the cache (or rather, newer ones overriding old ones) which breaks referential identity.

We now have a sort of mutex on the cache key as well as asserting the cache does not have an entry for the cache key before we put the module into it.

Fixes #11214.

Test plan

Test added

referencingModule.context,
);
try {
const module = new SourceTextModule(transformedCode, {
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ignore whitespace

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Codecov Report

Merging #11220 (7af697a) into master (420bcb7) will decrease coverage by 0.06%.
The diff coverage is 4.76%.

Impacted file tree graph

@@            Coverage Diff             @@
##           master   #11220      +/-   ##
==========================================
- Coverage   64.30%   64.24%   -0.07%     
==========================================
  Files         309      309              
  Lines       13485    13500      +15     
  Branches     3286     3288       +2     
==========================================
+ Hits         8672     8673       +1     
- Misses       4104     4118      +14     
  Partials      709      709              
Impacted Files Coverage Δ
packages/jest-runtime/src/index.ts 53.76% <4.76%> (-1.09%) ⬇️

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@SimenB SimenB merged commit 129c08d into jestjs:master Mar 20, 2021
@SimenB SimenB deleted the async-transform-race branch March 20, 2021 08:25
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27.0.0-next.5 ESM loading regression
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