fix: export types used in public API signatures for declaration emit compatibility

.changeset/fix-declaration-emit-exports.md

@@ -0,0 +1,12 @@
+---
+'@tanstack/db': patch
+---
+
+fix: export types used in public API signatures for declaration emit compatibility
+
+Types like `SchemaFromSource`, `MergeContextWithJoinType`, `WithResult`, `ResultTypeFromSelect`, and others
+are used in the public method signatures of `BaseQueryBuilder` (e.g. `from()`, `join()`, `select()`) but
+were not re-exported from the package's public API. This caused TypeScript error TS2742 when consumers used
+`declaration: true` in their tsconfig, as TypeScript could not name the inferred types in generated `.d.ts` files.
+
+Fixes #1012

packages/db/src/query/builder/index.ts

@@ -910,8 +910,26 @@ export type QueryResult<T> = GetResult<ExtractContext<T>>
 // Export the types from types.ts for convenience
 export type {
   Context,
+  ContextSchema,
   Source,
   GetResult,
   RefLeaf as Ref,
   InferResultType,
+  // Types used in public method signatures that must be exported
+  // for declaration emit to work (see https://github.com/TanStack/db/issues/1012)
+  SchemaFromSource,
+  InferCollectionType,
+  MergeContextWithJoinType,
+  MergeContextForJoinCallback,
+  ApplyJoinOptionalityToMergedSchema,
+  ResultTypeFromSelect,
+  WithResult,
+  JoinOnCallback,
+  RefsForContext,
+  WhereCallback,
+  OrderByCallback,
+  GroupByCallback,
+  SelectObject,
+  FunctionalHavingRow,
+  Prettify,
 } from './types.js'

packages/db/src/query/index.ts

@@ -7,11 +7,28 @@ export {
   type InitialQueryBuilder,
   type QueryBuilder,
   type Context,
+  type ContextSchema,
   type Source,
   type GetResult,
   type InferResultType,
   type ExtractContext,
   type QueryResult,
+  // Types needed for declaration emit (https://github.com/TanStack/db/issues/1012)
+  type SchemaFromSource,
+  type InferCollectionType,
+  type MergeContextWithJoinType,
+  type MergeContextForJoinCallback,
+  type ApplyJoinOptionalityToMergedSchema,
+  type ResultTypeFromSelect,
+  type WithResult,
+  type JoinOnCallback,
+  type RefsForContext,
+  type WhereCallback,
+  type OrderByCallback,
+  type GroupByCallback,
+  type SelectObject,
+  type FunctionalHavingRow,
+  type Prettify,
 } from './builder/index.js'
 
 // Expression functions exports