Function updateFields

src/App.tsx:33–37

(fields: Partial<FormData>)

function App() {
  const [data, setData] = useState(INITIAL_DATA)
  function updateFields(fields: Partial<FormData>) {
    setData(prev => {
      return { ...prev, ...fields }
    })
  }
  const { steps, currentStepIndex, step, isFirstStep, isLastStep, back, next } =
    useMultistepForm([
      <UserForm {...data} updateFields={updateFields} />,