snapshot of https://github.com/TanStack/query.git (main, 2026-09-16; blobs > 131072B omitted)

docs/eslint/no-void-query-fn.md

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+---
+id: no-void-query-fn
+title: Disallow returning void from query functions
+---
+
+Query functions must return a value that will be cached by TanStack Query. Functions that don't return a value (void functions) can lead to unexpected behavior and might indicate a mistake in the implementation.
+
+## Rule Details
+
+Example of **incorrect** code for this rule:
+
+```tsx
+/* eslint "@tanstack/query/no-void-query-fn": "error" */
+
+useQuery({
+  queryKey: ['todos'],
+  queryFn: async () => {
+    await api.todos.fetch() // Function doesn't return the fetched data
+  },
+})
+```
+
+Example of **correct** code for this rule:
+
+```tsx
+/* eslint "@tanstack/query/no-void-query-fn": "error" */
+useQuery({
+  queryKey: ['todos'],
+  queryFn: async () => {
+    const todos = await api.todos.fetch()
+    return todos
+  },
+})
+```
+
+## Attributes
+
+- [x] ✅ Recommended
+- [ ] 🔧 Fixable