Function fn

packages/query-core/src/__tests__/notifyManager.test.tsx:86–86

(a, b)

    // we define some fn with its signature:
    const fn: (a: string, b: number) => string = (a, b) => a + b

    // now someFn expect to be called with args [a: string, b: number]
    const someFn = notifyManagerTest.batchCalls(fn)