fix(react-db): support conditional query configs - #1757
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Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughThe live-query APIs now support conditional query callbacks that disable queries by returning ChangesConditional live-query configuration
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to The PR adds conditional query configuration support while preserving existing enabled-query behavior and reports passing targeted tests, type checks, and builds; no actionable merge-blocking risk remains beyond normal review. Sequence Diagram(s)sequenceDiagram
participant QueryCallback
participant prepareLiveQueryValue
participant useLiveQuery
participant LiveQueryResult
QueryCallback->>prepareLiveQueryValue: return query builder, undefined, or null
prepareLiveQueryValue->>useLiveQuery: provide prepared config or disabled value
useLiveQuery->>LiveQueryResult: expose data, status, collection, and isEnabled
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Inline comments:
In `@packages/react-db/tests/useLiveQuery.test.tsx`:
- Around line 2054-2095: The test around the conditional config query must cover
disabling while synchronization is still pending, not only after readiness. Add
a controlled asynchronous sync scenario that rerenders with enabled false before
sync resolves, then resolves the pending sync and verifies status stays disabled
while data and collection remain undefined, using the existing test helpers and
query symbols.
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packages/react-db/src/index.tspackages/react-db/src/useLiveQuery.tspackages/react-db/tests/useLiveQuery.test-d.tsxpackages/react-db/tests/useLiveQuery.test.tsx
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Allow
useLiveQuery({ query })callbacks to returnundefinedornull. Config-based queries can now use the same enabled/disabled pattern as the top-level callback form, with correct runtime state and TypeScript inference.Root cause
The config-object path invoked its
querycallback but always returned the surrounding config object. A nullish callback result therefore became{ query: undefined }or{ query: null }instead of the top-level nullish value used to mark a query as disabled. The React overloads also required config callbacks to return a builder, so valid conditional configs failed type checking before they reached that runtime path.Approach
querycallback to the prepared query value itself.ConditionalUseLiveQueryConfigfor disabled-capable configs while preserving the existing enabled-only meaning ofUseLiveQueryConfig.useLiveSuspenseQuery.Key invariants
undefinedandnullboth disable the query.UseLiveQueryConfigremains accepted byuseLiveSuspenseQuery.queryKeyis supplied.Non-goals
useLiveSuspenseQuery; suspense keeps the enabled-only config type.queryKeybehavior.Trade-offs
Preserving
UseLiveQueryConfigas enabled-only avoids a source-breaking change for reusable suspense configs. Conditional wrappers can use the new exportedConditionalUseLiveQueryConfigtype. This adds a public type and an overload, but keeps the patch release compatible and preserves precise enabled results.Verification
The React hook test file passes 54/54, the public type suite passes 16/16, and the affected package build and lint checks pass.
Files changed
packages/db/src/live-query-options.ts: propagate nullish config callback results as disabled queries.packages/db/tests/live-query-options.test.ts: cover config query preparation forundefinedandnull.packages/react-db/src/useLiveQuery.ts: add the conditional config type and standard/legacy overloads while preserving enabled config compatibility.packages/react-db/src/useLiveSuspenseQuery.ts: retain the public enabled-only config contract.packages/react-db/src/index.ts: exportConditionalUseLiveQueryConfig.packages/react-db/tests/useLiveQuery.test.tsx: cover disabled configs, derived-identity transitions, and the dependency-array compatibility path.packages/react-db/tests/useLiveQuery.test-d.tsx: cover conditionalfindOneinference, annotated suspense configs, dependency-array configs, and scalar rejection.docs/guides/live-queries.mdandpackages/react-db/skills/react-db/SKILL.md: document conditional config syntax and state..changeset/support-conditional-live-query-configs.md: publish patch releases for@tanstack/dband@tanstack/react-db.Summary by CodeRabbit
undefinedornullfrom a query callback.disabledstatus, undefined data, and appropriate readiness and enabled-state values.