Function _subscribe

src/logic/createFormControl.ts:1330–1377

(props)

  };

  const _subscribe: FromSubscribe<TFieldValues> = (props) => {
    const needsValues = !!(props.formState as Record<string, unknown>)?.values;
    if (needsValues) {
      _valuesSubscriberCount++;
    }
    const { unsubscribe } = _subjects.state.subscribe({
      next: (
        formState: Partial<FormState<TFieldValues>> & {
          name?: InternalFieldName;
          values?: TFieldValues | undefined;
          type?: EventType;
        },
      ) => {
        if (
          shouldSubscribeByName(props.name, formState.name, props.exact) &&
          shouldRenderFormState(
            formState,
            (props.formState as ReadFormState) || _proxyFormState,
            _setFormState,
            props.reRenderRoot,
          )
        ) {
          const snapshot = { ..._formValues } as TFieldValues;

          props.callback({
            values: snapshot,
            ..._formState,
            ...formState,
            defaultValues:
              _defaultValues as FormState<TFieldValues>['defaultValues'],
          });
        }
      },
    });
    if (!needsValues) {
      return unsubscribe;
    }
    let called = false;
    return () => {
      if (called) {
        return;
      }

      called = true;
      _valuesSubscriberCount--;
      unsubscribe();
    };
  };

  const subscribe: UseFormSubscribe<TFieldValues> = (props) => {
    _state.mount = true;