perf(history): avoid temporary arrays in hash parsing - #8351
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LadyBluenotes wants to merge 1 commit into
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perf(history): avoid temporary arrays in hash parsing#8351LadyBluenotes wants to merge 1 commit into
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📝 WalkthroughWalkthrough
ChangesHash history parsing
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Suggested reviewers: Merge Risk: 🟡 Moderate · up to Hash-history URLs with an empty hash and outer query now resolve to an invalid logical root location. This is a small localized fix, but it should be corrected before merge to preserve URL parsing behavior. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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🚀 Changeset Version Preview1 package(s) bumped directly, 23 bumped as dependents. 🟩 Patch bumps
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Actionable comments posted: 1
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Inline comments:
In `@packages/history/src/index.ts`:
- Line 625: Update the hash path extraction around pathPart/hashHref so an empty
path segment defaults to “/” before combining it with the query string. Preserve
existing behavior for non-empty hash paths and ensure a hash of “#” with a
search query produces the root location with that query.
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📒 Files selected for processing (3)
.changeset/history-hash-allocations.mdpackages/history/src/index.tspackages/history/tests/createHashHistory.test.ts
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Bundle Size BenchmarksThis pull request does not affect bundle size in any measured scenario. |
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🎯 Changes
Replace the three temporary arrays used to read a hash-history URL with string offsets. Preserve outer-query placement, repeated fragments, encoded delimiters, and the existing URL normalization. No cache or changes to
parseHref.Performance
Local Node.js 24.12.0 comparison of
6494e75362and7edd7ea841, using 128 mixed URLs and actualcreateHashHistoryreads with a synthetic window/history object. Medians from seven alternating timing rounds of 500,000 reads and three allocation profiles of 100,000 reads:Allocation profiles include objects collected by GC; these are not retained-heap or end-to-end application measurements. The standalone bundle uses Vite 8.0.14, minified ESM,
es2022, and gzip level 9. Browser-history-only output is byte-identical.✅ Checklist
🚀 Release Impact
Summary by CodeRabbit
Bug Fixes
Tests