refactor(router-core): decodePath fast path when no encoded chars

[Sheraff]

Most paths do not contain encoded paths and are just alphanumeric and -_/. We can optimize decodePath to return early in that case.

In our simple benchmark, this is a 3x improvement on the total time of decodePath from 156ms to 47ms (in a 30s run)

before

after

Summary by CodeRabbit

• Chores
  • Optimized path decoding performance by adding an early-exit mechanism for already-decoded and safe paths, reducing unnecessary processing overhead.

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[nx-cloud]

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---

☁️ Nx Cloud last updated this comment at 2026-01-25 10:56:53 UTC

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds an early-exit fast path optimization to decodePath that immediately returns when input contains no encoded markers, backslashes, control characters, or protocol-relative patterns, bypassing the full decoding logic for already-safe paths.

Changes

Cohort / File(s)	Summary
decodePath Fast Path Optimization packages/router-core/src/utils.ts	Adds conditional check to skip decoding for paths that are already safe (no encoded characters, backslashes, control chars, or protocol-relative patterns); returns early before existing decode logic executes

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• refactor(router-core): simplify decodePath implementation, improve performance #5867: Also modifies decodePath in the same file; one PR adds this early-exit fast path while the other rewrites it with an iterative/regex-based decoder approach
• refactor(router-core): utils/decodePath minor performance improvements #5865: Modifies the same decodePath implementation with performance-focused refactoring that overlaps in optimization goals

Suggested labels

performance

Suggested reviewers

• schiller-manuel
• nlynzaad

Poem

🐰 Hop-skip optimization so neat,
Fast paths make decodePath fleet,
Safe strings bypass decode's dance,
Quick return—no redundant prance! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and accurately describes the main change: adding a fast path optimization to the decodePath function that skips decoding when no encoded characters are present.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

---

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commit: e30a1fb