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fix: preserve provider ancestry during hydration recovery - #40
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🦋 Changeset detectedLatest commit: afa47da The changes in this PR will be included in the next version bump. This PR includes changesets to release 1 package
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Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughHydration recovery selects a container based on the failing fiber and restarts hydration. Tests cover provider ancestry, consumer state, document-shell identity, and cleanup. Benchmark records document bundle measurements and the updated DOM API size budget. ChangesHydration recovery
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Suggested reviewers: Merge Risk: ⚪ Minimal · up to Hydration recovery is intended to preserve the surrounding app and document shell while replacing the failed subtree; the supplied tests cover the key recovery and cleanup behaviors. No outstanding merge-blocking issue is identified. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The recovery repair preserves application context and contains cleanup to the intended subtree. No introduced security issue was established. Remaining uncertainty concerns independently owned or overlapping rendering roots, which the demonstrated lifecycle coverage does not resolve. Retained concerns Security review detailsSecurity Blast Radius
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Full details: Docstring CoverageExplanation Docstring coverage is 7.69% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 4 files. (2 skipped: 2 unsupported.)
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Inline comments:
Review comments at @packages/redact/src/dom/features/hydration/full.ts:
- Line 559: Update the resetAfterHydrationFailure call in the narrowed-retry
catch to pass recoveryContainer as the reset target, preserving the adopted
document shell and head resources when recovery fails.
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📒 Files selected for processing (8)
.changeset/hydration-provider-ancestry.mdbenchmarks/HYDRATION_RECOVERY.mdbenchmarks/results/hydration-recovery-baseline-sizes.jsonbenchmarks/results/hydration-recovery-sizes.jsonpackages/redact/src/dom/features/hydration/full.tsscripts/size-check.mjstests/document-hydration.test.tsxtests/hydration-recovery-lifecycle.test.tsx
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Fix
Hydration mismatch recovery was mounting the failed host's children as a new root, dropping components and context providers above it. This could leave Router outlets reading stale matches after navigation.
Keep the original root and component tree, adopt the unaffected document shell, and replace only the failed subtree. Later root renders still update the full app, and abandoned effects and subscriptions are cleaned up. If the narrowed recovery itself throws, its cleanup also preserves the document shell and head resources.
Validation
pnpm test:pr: 1,639 tests passed, 91 existing skips, types, build verification, and size checks passed.Release and size
Patch changeset for
@tanstack/redact, expected release 0.1.4. No public API, dependency, or scheduling changes.The final built DOM entry adds 36 gzip bytes and exceeds the old budget by 6 bytes. The approved budget adjustment remains 36 bytes, from 25,246 to 25,282, retaining a 30-byte margin. DOM client shrinks by 66 gzip bytes, combined client by 64, and default-Vite combined client by 63.
The review follow-up leaves minified sizes unchanged and saves another 5 gzip bytes in the DOM entry, but increases that entry by 39 Brotli bytes. Its final cost against main is +44 minified, +36 gzip and +72 Brotli bytes. The other three main client bundles remain smaller in all three formats. The included size records preserve the baseline and repaired inputs, including every feature variant. This is an explicit correctness tradeoff, not a zero-size-cost claim, and no additional budget increase was made.
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