perf(history): intern parseHref and skip sanitize on simple paths

[anonrig]

Summary

Split out of #8085 so bundle size and performance can be measured independently.

Repeated pushes of the same href reuse the last split. Paths that start with a single slash and have no query, hash, or control characters skip the sanitize regex. Open-redirect cases still go through sanitizePath.

Also treats query/hash markers at offset 0 as delimiters, so ?tab=one and #section stay out of the pathname.

Test plan

• packages/history/tests/parseHref.test.ts

Summary by CodeRabbit

• Bug Fixes

  • Fixed handling of query-only, hash-only, and query-plus-hash links so their path remains empty while query and hash values are preserved.
  • Improved history link processing for more consistent navigation behavior.

• Performance

  • Optimized repeated parsing of identical links for faster history updates.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: b02a8fe1-60b1-44cd-846d-95447f3a84b0

📥 Commits

Reviewing files that changed from the base of the PR and between f97188f and fa7b7fd.

📒 Files selected for processing (2)

• packages/history/src/index.ts
• packages/history/tests/parseHref.test.ts

Included review availability: Your plan includes up to 10 reviews per rolling hour; 9 remain after this review.

---

📝 Walkthrough

Walkthrough

The history package now caches parsed href components, uses a fast path for simple paths, centralizes history-state creation, and adds tests for query-only and hash-only href parsing.

Changes

History href parsing

Layer / File(s)	Summary
History state and parsing cache packages/history/src/index.ts	parseHref caches repeated hrefs, uses a fast path for simple absolute paths, and centralizes default history-state creation.
Sanitized parsing and component validation packages/history/src/index.ts, packages/history/tests/parseHref.test.ts	Sanitized parsing caches parsed components and separates pathname, search, and hash values for query-only, hash-only, and ?# hrefs.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to fa7b7

This is a localized history URL parsing optimization with targeted test updates, and no actionable merge-blocking risk remains beyond normal checks and review.

Possibly related PRs

• TanStack/router#8085: Both changes modify parseHref with caching, fast-path parsing, and shared history-state handling.

Suggested labels: package: history

Suggested reviewers: sheraff

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main parseHref performance changes in the history package.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}