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fix(web): bound Next route cache memory - #1594
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Organization UI Review profile: CHILL Plan: Pro Plus Run ID: 📒 Files selected for processing (6)
WalkthroughThe web package upgrades Next.js from 16.2.11 to 16.3.1. The changelog records the dynamic-route cache fix. Tests update mock typing and fixture fields for current interfaces. ChangesNext.js upgrade and test compatibility
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk:🔵 Low · up to The PR does not introduce an identified runtime or availability risk, but its changelog entry is not at the bottom of the Fixed section, leaving release-note ordering inconsistent; this is a bounded documentation follow-up. Possibly related PRs
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In `@CHANGELOG.md`:
- Line 11: Move the Next.js 16.3.1 upgrade entry to the bottom of the ### Fixed
section, after the existing entries, without changing its content.
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Configuration used: Organization UI
Review profile: CHILL
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Run ID: 6e91a11e-4b3b-43a1-8260-7e27c0492f02
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yarn.lockis excluded by!**/yarn.lock,!**/*.lock
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CHANGELOG.mdpackages/web/package.jsonpackages/web/src/ee/features/chat/useUnsavedChangesGuard.test.tsx
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Summary
Finding
Better Stack showed the post-major-GC heap floor tracking request volume with a 0.996 correlation and an observed slope of about 1.30 KiB/request. ALB logs showed that 198,239 distinct
/browsepathnames were requested during the inspected window; 99.93% of/browserequests came frommeta-externalagent.The deployed Next.js 16.2.11 build checks a concrete pathname against its filesystem manifests before matching a dynamic route. Each distinct
/browse/...pathname is therefore inserted as a negative entry infsChecker.getItemsLru. That cache has a nominal size of 1,048,576, but a cached miss has a value ofnulland was charged as only one unit. Its key was also a V8 sliced string that retained the full request URL.I reproduced this with the exact production image and runtime under Linux. After forced full GC, 1,000 requests that varied only the query string were flat, while 1,579 distinct valid blob pathnames retained 1.631 MiB (1.058 KiB/path). The heap snapshot contained 1,581 route-cache entries versus two in the repeated-path control, with the retained paths rooted through
Symbol(@next/router-server-methods) -> fsChecker -> getItemsLru.This is the same defect described in vercel/next.js#94890 and fixed by vercel/next.js#96229. The upstream fix charges the cache for the key plus per-entry overhead, copies sliced keys, and bounds the cache at 8 MiB. Next.js 16.3.0 was the first stable release containing it; this PR upgrades to the latest stable 16.3.1.
Verification
yarn workspace @sourcebot/web test --run— 115 files and 1,261 tests passedyarn workspace @sourcebot/web vitest run src/ee/features/chat/useUnsavedChangesGuard.test.tsx— 6 tests passedtsc --noEmit --pretty false— passedyarn workspace @sourcebot/web lint— passedUpstream references:
Summary by CodeRabbit
Bug Fixes
Documentation