From 2c3c84ccbd7ddcd62dddf786acd9729875fb6b41 Mon Sep 17 00:00:00 2001
From: Zelys <zelys@dfkhelper.com>
Date: Sun, 29 Mar 2026 15:58:41 -0500
Subject: [PATCH] test(eslint-plugin-query/no-void-query-fn): add coverage for
 prefetchQuery, prefetchInfiniteQuery, ensureQueryData,
 ensureInfiniteQueryData

---
 .../src/__tests__/no-void-query-fn.test.ts    | 114 ++++++++++++++++++
 1 file changed, 114 insertions(+)

diff --git a/packages/eslint-plugin-query/src/__tests__/no-void-query-fn.test.ts b/packages/eslint-plugin-query/src/__tests__/no-void-query-fn.test.ts
index e26c21de8f..c47856fbc6 100644
--- a/packages/eslint-plugin-query/src/__tests__/no-void-query-fn.test.ts
+++ b/packages/eslint-plugin-query/src/__tests__/no-void-query-fn.test.ts
@@ -215,6 +215,58 @@ ruleTester.run('no-void-query-fn', rule, {
         })
       `,
     },
+    {
+      name: 'prefetchQuery queryFn returns a value',
+      code: normalizeIndent`
+        import { QueryClient } from '@tanstack/react-query'
+
+        const queryClient = new QueryClient()
+        queryClient.prefetchQuery({
+          queryKey: ['test'],
+          queryFn: () => fetch('/api/test').then((r) => r.json()),
+        })
+      `,
+    },
+    {
+      name: 'prefetchInfiniteQuery queryFn returns a value',
+      code: normalizeIndent`
+        import { QueryClient } from '@tanstack/react-query'
+
+        const queryClient = new QueryClient()
+        queryClient.prefetchInfiniteQuery({
+          queryKey: ['test'],
+          queryFn: ({ pageParam }: { pageParam: number }) =>
+            fetch(\`/api/test?page=\${pageParam}\`).then((r) => r.json()),
+          initialPageParam: 0,
+        })
+      `,
+    },
+    {
+      name: 'ensureQueryData queryFn returns a value',
+      code: normalizeIndent`
+        import { QueryClient } from '@tanstack/react-query'
+
+        const queryClient = new QueryClient()
+        queryClient.ensureQueryData({
+          queryKey: ['test'],
+          queryFn: () => fetch('/api/test').then((r) => r.json()),
+        })
+      `,
+    },
+    {
+      name: 'ensureInfiniteQueryData queryFn returns a value',
+      code: normalizeIndent`
+        import { QueryClient } from '@tanstack/react-query'
+
+        const queryClient = new QueryClient()
+        queryClient.ensureInfiniteQueryData({
+          queryKey: ['test'],
+          queryFn: ({ pageParam }: { pageParam: number }) =>
+            fetch(\`/api/test?page=\${pageParam}\`).then((r) => r.json()),
+          initialPageParam: 0,
+        })
+      `,
+    },
   ],
   invalid: [
     {
@@ -439,5 +491,67 @@ ruleTester.run('no-void-query-fn', rule, {
       `,
       errors: [{ messageId: 'noVoidReturn' }],
     },
+    {
+      name: 'prefetchQuery queryFn returns void',
+      code: normalizeIndent`
+        import { QueryClient } from '@tanstack/react-query'
+
+        const queryClient = new QueryClient()
+        queryClient.prefetchQuery({
+          queryKey: ['test'],
+          queryFn: async () => {
+            await fetch('/api/test')
+          },
+        })
+      `,
+      errors: [{ messageId: 'noVoidReturn' }],
+    },
+    {
+      name: 'prefetchInfiniteQuery queryFn returns void',
+      code: normalizeIndent`
+        import { QueryClient } from '@tanstack/react-query'
+
+        const queryClient = new QueryClient()
+        queryClient.prefetchInfiniteQuery({
+          queryKey: ['test'],
+          queryFn: async ({ pageParam }: { pageParam: number }) => {
+            await fetch(\`/api/test?page=\${pageParam}\`)
+          },
+          initialPageParam: 0,
+        })
+      `,
+      errors: [{ messageId: 'noVoidReturn' }],
+    },
+    {
+      name: 'ensureQueryData queryFn returns void',
+      code: normalizeIndent`
+        import { QueryClient } from '@tanstack/react-query'
+
+        const queryClient = new QueryClient()
+        queryClient.ensureQueryData({
+          queryKey: ['test'],
+          queryFn: async () => {
+            await fetch('/api/test')
+          },
+        })
+      `,
+      errors: [{ messageId: 'noVoidReturn' }],
+    },
+    {
+      name: 'ensureInfiniteQueryData queryFn returns void',
+      code: normalizeIndent`
+        import { QueryClient } from '@tanstack/react-query'
+
+        const queryClient = new QueryClient()
+        queryClient.ensureInfiniteQueryData({
+          queryKey: ['test'],
+          queryFn: async ({ pageParam }: { pageParam: number }) => {
+            await fetch(\`/api/test?page=\${pageParam}\`)
+          },
+          initialPageParam: 0,
+        })
+      `,
+      errors: [{ messageId: 'noVoidReturn' }],
+    },
   ],
 })