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close #6122

Description

When adding a custom equality tester in vitest.setup, for example

function numberEquality(actual, expected) {
  return typeof expected === 'number' ? actual === expected : undefined;
}
expect.addEqualityTesters([
  numberEquality
]);

it is not relayed to typed-array values in toStrictEqual matches.

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

  • It's really useful if your PR references an issue where it is discussed ahead of time. If the feature is substantial or introduces breaking changes without a discussion, PR might be closed.
  • Ideally, include a test that fails without this PR but passes with it.
  • Please, don't make changes to pnpm-lock.yaml unless you introduce a new test example.

Tests

  • Run the tests with pnpm test:ci.

Documentation

  • If you introduce new functionality, document it. You can run documentation with pnpm run docs command.

Changesets

  • Changes in changelog are generated from PR name. Please, make sure that it explains your changes in an understandable manner. Please, prefix changeset messages with feat:, fix:, perf:, docs:, or chore:.

@sheremet-va sheremet-va merged commit 6dc1d18 into vitest-dev:main May 18, 2025
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Custom equality testers are not properly relayed to typed arrays

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