test(db): cover independent observer revisions - #1842
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Included review availability: Your plan provides up to 8 included reviews per hour; 5 remain after this review. 📝 WalkthroughWalkthroughThe pull request adds a wholesale-mode ChangesLive Query Observer
Priority: ⬇️ Low Estimated code review effort: 1 (Trivial) | ~5 minutes Change: Other Merge Risk: ⚪ Minimal · up to The added test strengthens regression coverage for retained wholesale observer snapshots. No actionable current-head risk remains. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@packages/db/tests/live-query-observer.test.ts`:
- Line 648: Extend the live-query observer test to assert that the prior
snapshot remains unchanged after the layout update, in addition to the existing
afterLayout assertion. Reuse the earlier snapshot value and verify its state
keys still represent the pre-update result after the delete-and-insert commit.
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packages/db/tests/live-query-observer.test.ts
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This adds a focused contract test for the existing public
createLiveQueryObserverpath. There is no user-visible API or runtime change: the proposed React lazy hooks and@tanstack/react-db/lazyartifact are intentionally absent.Root cause
The observer suite covered fresh snapshots, immutable historical snapshots, and layout changes separately, but did not bind the two observer clocks in one public-path witness. A value-only update must publish a fresh snapshot without advancing
layoutRevision; a same-sized key replacement must advance it.Approach
Key invariants
layoutRevisiontracks ordered keys, not arbitrary value changes or collection size alone.Non-goals
useLazyLiveQueryoruseLazyItemimplementation.@tanstack/react-db/lazyexport or artifact.PR #1825 has landed and is included in this PR's base. Identity,
virtual-metadata, and paced-scheduler work remains deferred until the core
reconciliation/publication base in PR #1835 lands.
Trade-offs
The witness lives in the core observer owner rather than React conformance because it tests an existing core public path and would be false evidence of React behavior if placed in the framework suite. The diff is test-only, so no changeset is included.
Verification
Two hostile mutants were killed on the same public path: suppressing the
observer's layout-revision increment failed at the revision assertion, and
mutating the previously returned snapshot during the later membership update
failed with expected keys
[1, 2]versus received[1, 3]. Restoring theimplementation returned the exact focused command to green.
Package weight
Base and head normal/minified ESM and CJS outputs are byte-identical. Deterministic aggregate measurements across production JavaScript:
-n -9The npm archive is also identical: 1,547,892 B packed, 7,363,069 B unpacked, 641 entries, with the same SHA-512 integrity hash.
Files changed
packages/db/tests/live-query-observer.test.ts— adds the independent value/layout revision witness.Provenance and credit
thruflo), Kyle MathewsAddresses #50 and #126 by preserving the core observer law needed by a future fine-grained React adapter. This PR does not close either issue, and PR #1515 remains separate.
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