Fix useQueries type

.changepacks/changepack_log_2_T-K8HzrduvcHMnQArqi.json

@@ -0,0 +1 @@
+{"changes":{"packages/react-query/package.json":"Patch"},"note":"Fix useQueries type","date":"2026-03-25T11:48:18.986238800Z"}

.gitignore

@@ -35,3 +35,4 @@ report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
 
 .claude
 .sisyphus
+.omc

package.json

@@ -5,6 +5,7 @@
   "private": true,
   "devDependencies": {
     "@biomejs/biome": "^2.3",
+    "@devup-api/react-query": "workspace:*",
     "@testing-library/react": "^16.3.2",
     "@testing-library/react-hooks": "^8.0.1",
     "@types/bun": "latest",

packages/react-query/src/__tests__/types.test.ts

@@ -0,0 +1,213 @@
+/**
+ * Type tests for DevupQueryClient
+ * Verify that useQueries type inference works correctly per element
+ */
+import { describe, expectTypeOf, test } from 'bun:test'
+import type { DevupGetApiStruct } from '@devup-api/core'
+import type { DevupQueryClient } from '../query-client'
+
+// =============================================================================
+// Test Fixtures
+// =============================================================================
+
+declare module '@devup-api/core' {
+  interface DevupApiServers {
+    'react-query-test.json': never
+  }
+
+  interface DevupGetApiStruct {
+    'react-query-test.json': {
+      '/users': {
+        response: { id: number; name: string }[]
+        error: { message: string }
+      }
+      '/users/{id}': {
+        params: { id: string }
+        response: { id: number; name: string; email: string }
+        error: { message: string; code: number }
+      }
+      '/posts': {
+        response: { id: number; title: string }[]
+        error: { message: string }
+      }
+    }
+  }
+
+  interface DevupPostApiStruct {
+    'react-query-test.json': {
+      '/users': {
+        body: { name: string; email: string }
+        response: { id: number }
+        error: { message: string }
+      }
+    }
+  }
+
+  interface DevupDeleteApiStruct {
+    'react-query-test.json': {
+      '/users/{id}': {
+        params: { id: string }
+        response: { success: boolean }
+        error: { message: string }
+      }
+    }
+  }
+}
+
+type QC = DevupQueryClient<'react-query-test.json'>
+
+// =============================================================================
+// useQueries - Per-element return type inference
+// =============================================================================
+
+describe('useQueries per-element type inference', () => {
+  test('different endpoints return different response types', () => {
+    type Result = ReturnType<
+      (
+        qc: QC,
+      ) => ReturnType<
+        typeof qc.useQueries<[['get', '/users'], ['get', '/posts']]>
+      >
+    >
+
+    expectTypeOf<Result[0]['data']>().toEqualTypeOf<
+      { id: number; name: string }[] | undefined
+    >()
+    expectTypeOf<Result[1]['data']>().toEqualTypeOf<
+      { id: number; title: string }[] | undefined
+    >()
+  })
+
+  test('different endpoints return different error types', () => {
+    type Result = ReturnType<
+      (
+        qc: QC,
+      ) => ReturnType<
+        typeof qc.useQueries<
+          [
+            ['get', '/users/{id}', { params: { id: string } }],
+            ['get', '/users'],
+          ]
+        >
+      >
+    >
+
+    expectTypeOf<Result[0]['data']>().toEqualTypeOf<
+      { id: number; name: string; email: string } | undefined
+    >()
+    expectTypeOf<Result[0]['error']>().toEqualTypeOf<{
+      message: string
+      code: number
+    } | null>()
+    expectTypeOf<Result[1]['data']>().toEqualTypeOf<
+      { id: number; name: string }[] | undefined
+    >()
+    expectTypeOf<Result[1]['error']>().toEqualTypeOf<{
+      message: string
+    } | null>()
+  })
+
+  test('single element preserves exact type', () => {
+    type Result = ReturnType<
+      (qc: QC) => ReturnType<typeof qc.useQueries<[['get', '/posts']]>>
+    >
+
+    expectTypeOf<Result[0]['data']>().toEqualTypeOf<
+      { id: number; title: string }[] | undefined
+    >()
+  })
+
+  test('result types are not intersected', () => {
+    type Result = ReturnType<
+      (
+        qc: QC,
+      ) => ReturnType<
+        typeof qc.useQueries<[['get', '/users'], ['get', '/posts']]>
+      >
+    >
+
+    // result[0] should NOT have title (from /posts)
+    type Data0 = NonNullable<Result[0]['data']>[number]
+    expectTypeOf<
+      'title' extends keyof Data0 ? true : false
+    >().toEqualTypeOf<false>()
+
+    // result[1] should NOT have name (from /users)
+    type Data1 = NonNullable<Result[1]['data']>[number]
+    expectTypeOf<
+      'name' extends keyof Data1 ? true : false
+    >().toEqualTypeOf<false>()
+  })
+})
+
+// =============================================================================
+// useQueries - params constraint
+// =============================================================================
+
+describe('useQueries params constraint', () => {
+  test('endpoint with params accepts params option', () => {
+    // This should be valid: correct params provided
+    type _Valid = ReturnType<
+      (
+        qc: QC,
+      ) => ReturnType<
+        typeof qc.useQueries<
+          [['get', '/users/{id}', { params: { id: string } }]]
+        >
+      >
+    >
+  })
+
+  test('endpoint without params has optional options', () => {
+    // This should be valid: no options needed
+    type _Valid = ReturnType<
+      (qc: QC) => ReturnType<typeof qc.useQueries<[['get', '/users']]>>
+    >
+  })
+})
+
+// =============================================================================
+// useQuery - single query type inference (baseline)
+// =============================================================================
+
+describe('useQuery type inference baseline', () => {
+  test('response type inferred from endpoint', () => {
+    type Result = ReturnType<
+      (
+        qc: QC,
+      ) => ReturnType<
+        typeof qc.useQuery<
+          'get',
+          DevupGetApiStruct['react-query-test.json'],
+          '/users'
+        >
+      >
+    >
+
+    expectTypeOf<Result['data']>().toEqualTypeOf<
+      { id: number; name: string }[] | undefined
+    >()
+  })
+
+  test('error type inferred from endpoint', () => {
+    type Result = ReturnType<
+      (
+        qc: QC,
+      ) => ReturnType<
+        typeof qc.useQuery<
+          'get',
+          DevupGetApiStruct['react-query-test.json'],
+          '/users/{id}'
+        >
+      >
+    >
+
+    expectTypeOf<Result['data']>().toEqualTypeOf<
+      { id: number; name: string; email: string } | undefined
+    >()
+    expectTypeOf<Result['error']>().toEqualTypeOf<{
+      message: string
+      code: number
+    } | null>()
+  })
+})