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fix: pass matcher context to asymmetric matchers #11926

merged 3 commits into from Oct 5, 2021


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@SimenB SimenB commented Oct 4, 2021


This exposes that asymmetric matchers are not called with this - which IMO is a bug. For now I've stuck a @ts-ignore there, but we should fix it

Asymmetric matchers were not called with matcher context - meaning they didn't have access to this.equals, this.utils etc..

First commit makes TypeScript highlight that as an error, second commit fixes passing this.

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@SimenB SimenB changed the title fix: type RawMatcherFn with correct this fix: pass matcher context to asymmetric matchers Oct 4, 2021
const {pass} = matcher(
const {pass} =
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@SimenB SimenB Oct 4, 2021

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here's the fix - our own matchers "cheat" by not using this but rather importing equals etc directly

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@codecov-commenter codecov-commenter commented Oct 4, 2021

Codecov Report

Merging #11926 (010797a) into main (b9fc8ac) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

Impacted file tree graph

@@            Coverage Diff             @@
##             main   #11926      +/-   ##
- Coverage   68.76%   68.75%   -0.01%     
  Files         322      322              
  Lines       16591    16589       -2     
  Branches     4787     4786       -1     
- Hits        11408    11406       -2     
  Misses       5151     5151              
  Partials       32       32              
Impacted Files Coverage Δ
packages/expect/src/asymmetricMatchers.ts 83.33% <100.00%> (ø)
packages/expect/src/jestMatchersObject.ts 82.85% <100.00%> (-0.48%) ⬇️
packages/expect/src/matchers.ts 97.86% <100.00%> (-0.01%) ⬇️

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@SimenB SimenB merged commit f13abff into facebook:main Oct 5, 2021
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@SimenB SimenB deleted the type-raw-matcher-fn branch Oct 5, 2021
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3 participants