Function useController

src/useController.ts:50–284

(
  props: UseControllerProps<TFieldValues, TName, TTransformedValues>,
)

 * ```
 */
export function useController<
  TFieldValues extends FieldValues = FieldValues,
  TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>,
  TTransformedValues = TFieldValues,
>(
  props: UseControllerProps<TFieldValues, TName, TTransformedValues>,
): UseControllerReturn<TFieldValues, TName> {
  const formControl = useFormControlContext<
    TFieldValues,
    any,
    TTransformedValues
  >();
  const {
    name,
    disabled,
    control = formControl,
    shouldUnregister,
    defaultValue,
    exact = true,
  } = props;
  const isArrayField = isNameInFieldArray(control._names.array, name);

  const defaultValueMemo = React.useMemo(
    () =>
      get(
        control._formValues,
        name,
        get(control._defaultValues, name, defaultValue),
      ),
    [control, name, defaultValue],
  );

  const value = useWatch({
    control,
    name,
    defaultValue: defaultValueMemo,
    exact,
  }) as FieldPathValue<TFieldValues, TName>;

  const formState = useFormState({
    control,
    name,
    exact,
  });

  const _props = React.useRef(props);
  const _proxyRef = React.useRef<any>(null);

  const _registerProps = React.useRef(
    control.register(name, {
      ...props.rules,
      value,
      ...(isBoolean(props.disabled) ? { disabled: props.disabled } : {}),
    }),
  );

  _props.current = props;