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:

/* 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:

/* eslint "@tanstack/query/no-void-query-fn": "error" */
useQuery({
  queryKey: ['todos'],
  queryFn: async () => {
    const todos = await api.todos.fetch()
    return todos
  },
})

The rule requires typed linting and does not report anything without it.

Attributes#

• ✅ Recommended
• 🔧 Fixable