fix(powersync-db-collection): additional export to make type definitions portable

[illkle]

🎯 Changes

In monorepo setups you might have something like this:

• packages/db/powersync/schema.ts
• web/db/powersync.ts // new PowerSyncDatabase({database: WaSqlite, schema: SchemaFromSharedPackage}
• expo/db/powersync.ts // new PowerSyncDatabase({database: opSqlite, schema: SchemaFromSharedPackage}
• packages/db/tanstack-db/index.ts

However currently it's not possible to make a function that will take db: AbstractPowerSyncDatabase and return a tanstack collection due to type issues.

Error is:

The inferred type of 'createTanstackCollection' cannot be named without a reference to '../../../../node_modules/@tanstack/powersync-db-collection/dist/esm/helpers'. This is likely not portable. A type annotation is necessary

Collection type looks like this

type SomeCollection = Collection<OptionalExtractedTable<SomeTableType>, string, PowerSyncCollectionUtils<SomeTableType> never,OptionalExtractedTable<SomeTableType>> &  NonSingleResult;

The only export missing from @tanstack/powersync-db-collection is OptionalExtractedTable.

Video demonstration of me patching node_modules and the typescript issue going away

2026-02-20.at.00.34.23.mp4

✅ Checklist

• I have tested this code locally with pnpm test.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

[changeset-bot]

🦋 Changeset detected

Latest commit: abd6572

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@tanstack/powersync-db-collection	Minor

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