// ✅ passes (1 mock call)
const a = vi.fn<() => Promise<string>>().mockResolvedValueOnce('a');

// ❌ false positive (2 mock calls — type param IS present)
const b = vi.fn<() => Promise<string>>()
  .mockResolvedValueOnce('a')
  .mockResolvedValueOnce('b');
The rule appears to treat the outermost call in the chain (.mockResolvedValueOnce) as the mock function call requiring type parameters, rather than vi.fn.