fix(offline-transactions): harden value serialization - #1873
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Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughThe offline transaction serializer now validates Temporal brands, rejects circular values with a bounded error, preserves repeated non-cyclic references, and serializes arrays without precomputing index lists. Tests cover these behaviors. ChangesOffline serializer hardening
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to Supported serialization behavior is preserved, and invalid circular transactions fail before being stored. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Inline comments:
In `@packages/offline-transactions/src/outbox/TransactionSerializer.ts`:
- Line 238: Update serializeValue to add a toJSON receiver to ancestors while
traversing its replacement, pass that receiver through recursive calls, and
remove it afterward with cleanup in all paths. Permit the immediate toJSON() {
return this } replacement, but throw the existing circular-structure TypeError
for later references to that receiver; add regression coverage for a replacement
returning { back: source } while preserving existing self-replacement coverage.
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.changeset/fix-offline-serializer-hardening.mdpackages/offline-transactions/src/outbox/TransactionSerializer.tspackages/offline-transactions/tests/transaction-serializer.property.test.ts
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Follow up #1837 by making offline transaction serialization fail safely on cycles, preserving user objects that only imitate Temporal tags, and removing an avoidable allocation from array traversal. Apps now get a bounded circular-value error instead of a stack overflow, and spoofed values survive outbox storage instead of being silently dropped during replay.
Root cause
The v3 serializer recursively walked values without tracking the active ancestor chain. It also treated
Symbol.toStringTagas sufficient proof of a Temporal value and invoked the value's owntoString(), so ordinary user data could be encoded as a Temporal marker. Arrays additionally materialized a string-index array before traversal.Approach
WeakSet, remove each value infinally, and reject only actual cycles withTypeError: Converting circular structure to JSON.toStringmethod before writing a marker.Key invariants
Non-goals
Trade-offs
Ancestor tracking adds one
WeakSetmembership check per traversed object. It intentionally tracks only the current recursion path so repeated aliases do not become false cycle errors.Verification
Results: 187/187 package tests passed, including 37/37 serializer-oracle tests; typecheck, build, lint, formatting, and diff checks passed.
Files changed
TransactionSerializer.ts: bounded cycle rejection, Temporal brand validation, and direct array iteration.transaction-serializer.property.test.ts: permanent RED/GREEN witnesses and updated executable contract.@tanstack/offline-transactions.Related: #1837
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