Create a reverse map for faster itemBlock lookups #73930
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Size Change: +15 B (0%) Total Size: 2.58 MB
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Flaky tests detected in 0b711b4. 🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/20199102920
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Mamaduka
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[Type] Performance
Mamaduka
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Dec 12, 2025
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With all the "mocking," there's probably little value in unit tests here, IMO. I think we have decent e2e test coverage. If something is missing, let's try to improve it.
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do these hooks have coverage already (where)? do we have test coverage reports that tell us what is or isn't covered?
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Usually, it's preferred to write e2e tests, unless the utility methods are complex. Besides components and data packages, you won't see a lot of unit tests.
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adamsilverstein
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[Type] Enhancement
Mamaduka
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Dec 15, 2025
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Thank you, @adamsilverstein!
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What?
Improves performance of useBlockComments when there are many notes by replacing an O(n²) nested loop with an O(n) direct lookup. Previously, the code used Object.keys().find() to locate block client IDs for each comment thread, resulting in a search through all blocks for every thread. This change creates a reverse mapping (commentIdToBlockClientId) from comment IDs to block client IDs once, then performs constant-time lookups instead.
Part of #71668