fix(powersync): preserve updates and support PowerSync 2 - #1831
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Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughThe package adds PowerSync 2 compatibility, persists only changed fields, restricts diff triggers to declared columns, updates inferred table types, adopts structured logging, and adds correctness, declaration, integration, and documentation coverage. ChangesPowerSync correctness and compatibility
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix · Severity of issue fixed: Medium Suggested reviewers: Merge Risk: ⚪ Minimal · up to No actionable current-head risk remains from the reviewed change. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
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Full details: Out of Scope Changes checkExplanation The PR adds transformed Standard Schema comparator behavior in
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In `@docs/collections/powersync-collection.md`:
- Line 59: Change the CommonPowerSyncDatabase import in the connector example to
a type-only import, since uploadData uses it only as a parameter type and
verbatimModuleSyntax requires type-only imports for such symbols.
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.changeset/fix-powersync-correctness.mddocs/collections/powersync-collection.mdpackages/powersync-db-collection/package.jsonpackages/powersync-db-collection/src/PowerSyncTransactor.tspackages/powersync-db-collection/src/definitions.tspackages/powersync-db-collection/src/helpers.tspackages/powersync-db-collection/src/index.tspackages/powersync-db-collection/src/powersync.tspackages/powersync-db-collection/src/serialization.tspackages/powersync-db-collection/tests/correctness-oracle.test.tspackages/powersync-db-collection/tests/on-demand-sync.test.tspackages/powersync-db-collection/tests/portable-declarations.test.tspackages/powersync-db-collection/tests/powersync.test-d.tspackages/powersync-db-collection/tests/powersync.test.tspackages/powersync-db-collection/tests/transactor-readiness.test.ts
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simolus3
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From a PowerSync perspective I'm happy with the v2 migration here.
Co-authored-by: Ali Ansari <322224371+AliNaqiAnsari@users.noreply.github.com> Co-authored-by: lukasz wolski <5732713+lukiwolski@users.noreply.github.com> Co-authored-by: Simon Binder <simon@journeyapps.com> Co-authored-by: Kirill Kleymenov <k.kelolov@gmail.com>
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Fixes PowerSync collection updates so disjoint SQLite changes are conserved, keeps public rows congruent with declared PowerSync tables, and restores compatibility with PowerSync 2. It also fixes transformed-schema comparator types/runtime behavior and makes inferred public declarations portable.
Root cause
The adapter wrote each update's full optimistic row, so an independently newer SQLite field could be overwritten and emitted as a stale PATCH. Diff triggers also inferred keys from PowerSync's internal backing table instead of the declared table. Separately, the adapter still depended on PowerSync 1 database/logger/table internals, and its collection base type described comparators as raw SQLite rows even when a Standard Schema transformed the output.
Approach
mutation.changes, excludeidbefore serialization, and address the row by its original ID.[].OptionalExtractedTablehelper needed by emitted declarations.Key invariants
idas a changed value.1.0 code-weight gate
fileslist and add no published or bundle weight. The declaration harness consumes existing build output and never rebuilds shareddist/during tests.Non-goals
Trade-offs
PowerSync 2 is the single supported peer rather than carrying a version-detection shim. The update path preserves no-ops because they are valid existing mutations, while unsupported metadata remains unchanged instead of growing a general compatibility layer. The changeset is minor because the peer-major requirement is a compatibility boundary even though the adapter remains pre-1.0.
Verification
Exact rebased base:
3ad64a42a0088e1272176fb33c953526fed9b868The pre-simplification review head also passed all 148 package-local runtime/type tests. The final simplification head passed the direct adapter build, direct package typecheck, 16 affected oracle/declaration/serializer tests, and touched-file ESLint. Vitest's embedded typecheck process on the earlier head exited nonzero after its passing tests because of 128 pre-existing cross-package
rootDiralias diagnostics; the isolated packagetsc --noEmitcommand above is clean.Files changed
PowerSyncTransactor.ts: changes-only updates, empty-update handling, linear collection discovery, actual-write completion, and structured logging.definitions.ts,helpers.ts,serialization.ts,index.ts: PowerSync 2 inference, transformed output typing, and the narrow portable type export.powersync.ts: declared trigger columns and PowerSync 2 structured logger calls.Provenance and credit
7561bf90,f5f844054c2abb5dSupersedes #1277 and #1688.
Closes #1811
Closes #1817
Closes #1818
Summary by CodeRabbit
Bug Fixes
New Features
OptionalExtractedTableand improved inferred types and portable generated declarations.Documentation