[fix] findOne returns array instead of single object in angular-db (issue #1261)

[claude]

Summary

• Fixes injectLiveQuery in @tanstack/angular-db to return a single object (or undefined) when used with findOne(), instead of always returning an array
• Adds proper type overloads so TypeScript correctly infers Signal<T | undefined> for findOne() queries

Fixes#1261
Repro PR: #1272

Root cause

The angular-db adapter was missing the singleResult handling that was already implemented in react-db and vue-db. Specifically:

1. Runtime: syncDataFromCollection always converted collection values to an array via Array.from(currentCollection.values()) and set it directly on the data signal. It never checked collection.config.singleResult to decide whether to return a single item or the full array.

2. Types: InjectLiveQueryResult.data was always typed as Signal<Array<TResult>>, with no way to express Signal<TResult | undefined> for findOne() queries.

Fix

• Added a computed signal for data that checks collection.config.singleResult and returns either the first element or the full array (matching the pattern in vue-db and react-db)
• Updated InjectLiveQueryResult to use InferResultType<TContext> for the data signal type, which correctly resolves to T | undefined for SingleResult contexts and Array<T> otherwise
• Added InjectLiveQueryResultWithCollection and InjectLiveQueryResultWithSingleResultCollection interfaces for pre-created collection overloads

How to test

pnpm --filter @tanstack/angular-db test -- --run

All 21 tests pass, including the new findOne test.

🤖 Generated with Claude Code

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🦋 Changeset detected

Latest commit: 60c11dd

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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@tanstack/angular-db	Patch

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commit: 60c11dd

[github-actions]

Size Change: 0 B

Total Size: 92.1 kB

ℹ️ View Unchanged

Filename	Size
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./packages/db/dist/esm/deferred.js	207 B
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./packages/db/dist/esm/local-only.js	808 B
./packages/db/dist/esm/local-storage.js	2.1 kB
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./packages/db/dist/esm/proxy.js	3.75 kB
./packages/db/dist/esm/query/builder/functions.js	733 B
./packages/db/dist/esm/query/builder/index.js	4.09 kB
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./packages/db/dist/esm/query/compiler/expressions.js	430 B
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./packages/db/dist/esm/query/expression-helpers.js	1.43 kB
./packages/db/dist/esm/query/ir.js	673 B
./packages/db/dist/esm/query/live-query-collection.js	360 B
./packages/db/dist/esm/query/live/collection-config-builder.js	5.44 kB
./packages/db/dist/esm/query/live/collection-registry.js	264 B
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./packages/db/dist/esm/query/live/internal.js	145 B
./packages/db/dist/esm/query/optimizer.js	2.62 kB
./packages/db/dist/esm/query/predicate-utils.js	2.97 kB
./packages/db/dist/esm/query/subset-dedupe.js	921 B
./packages/db/dist/esm/scheduler.js	1.3 kB
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./packages/db/dist/esm/strategies/debounceStrategy.js	247 B
./packages/db/dist/esm/strategies/queueStrategy.js	428 B
./packages/db/dist/esm/strategies/throttleStrategy.js	246 B
./packages/db/dist/esm/transactions.js	2.9 kB
./packages/db/dist/esm/utils.js	924 B
./packages/db/dist/esm/utils/browser-polyfills.js	304 B
./packages/db/dist/esm/utils/btree.js	5.61 kB
./packages/db/dist/esm/utils/comparison.js	952 B
./packages/db/dist/esm/utils/cursor.js	457 B
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./packages/db/dist/esm/utils/type-guards.js	157 B

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[github-actions]

Size Change: 0 B

Total Size: 3.7 kB

ℹ️ View Unchanged

Filename	Size
./packages/react-db/dist/esm/index.js	225 B
./packages/react-db/dist/esm/useLiveInfiniteQuery.js	1.17 kB
./packages/react-db/dist/esm/useLiveQuery.js	1.34 kB
./packages/react-db/dist/esm/useLiveSuspenseQuery.js	559 B
./packages/react-db/dist/esm/usePacedMutations.js	401 B

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[samwillis]

LGTM

[github-actions]

🎉 This PR has been released!

• @tanstack/angular-db@0.1.55

Thank you for your contribution!