How to use the react-reconciler/reflection.findCurrentHostFiber function in react-reconciler

function findHostInstance(component: Object): PublicInstance | null {
  const fiber = getInstance(component);
  if (fiber === undefined) {
    if (typeof component.render === 'function') {
      invariant(false, 'Unable to find node on an unmounted component.');
    } else {
      invariant(
        false,
        'Argument appears to not be a ReactComponent. Keys: %s',
        Object.keys(component),
      );
    }
  }
  const hostFiber = findCurrentHostFiber(fiber);
  if (hostFiber === null) {
    return null;
  }
  return hostFiber.stateNode;
}

const getHostProps = function(fiber) {
    const host = findCurrentHostFiber(fiber);
    if (host) {
      return host.memoizedProps || emptyObject;
    }
    return emptyObject;
  };

function findHostInstance(component: Object): PublicInstance | null {
  const fiber = getInstance(component);
  if (fiber === undefined) {
    if (typeof component.render === 'function') {
      invariant(false, 'Unable to find node on an unmounted component.');
    } else {
      invariant(
        false,
        'Argument appears to not be a ReactComponent. Keys: %s',
        Object.keys(component),
      );
    }
  }
  const hostFiber = findCurrentHostFiber(fiber);
  if (hostFiber === null) {
    return null;
  }
  return hostFiber.stateNode;
}

methodName: string,
): PublicInstance | null {
  if (__DEV__) {
    const fiber = getInstance(component);
    if (fiber === undefined) {
      if (typeof component.render === 'function') {
        invariant(false, 'Unable to find node on an unmounted component.');
      } else {
        invariant(
          false,
          'Argument appears to not be a ReactComponent. Keys: %s',
          Object.keys(component),
        );
      }
    }
    const hostFiber = findCurrentHostFiber(fiber);
    if (hostFiber === null) {
      return null;
    }
    if (hostFiber.mode & StrictMode) {
      const componentName = getComponentName(fiber.type) || 'Component';
      if (!didWarnAboutFindNodeInStrictMode[componentName]) {
        didWarnAboutFindNodeInStrictMode[componentName] = true;
        if (fiber.mode & StrictMode) {
          warningWithoutStack(
            false,
            '%s is deprecated in StrictMode. ' +
              '%s was passed an instance of %s which is inside StrictMode. ' +
              'Instead, add a ref directly to the element you want to reference. ' +
              'Learn more about using refs safely here: ' +
              'https://fb.me/react-strict-mode-find-node%s',
            methodName,

const getHostProps = function(fiber) {
    const host = findCurrentHostFiber(fiber);
    if (host) {
      return host.memoizedProps || emptyObject;
    }
    return emptyObject;
  };

function findHostInstance(component: Object): PublicInstance | null {
  const fiber = ReactInstanceMap.get(component);
  if (fiber === undefined) {
    if (typeof component.render === 'function') {
      invariant(false, 'Unable to find node on an unmounted component.');
    } else {
      invariant(
        false,
        'Argument appears to not be a ReactComponent. Keys: %s',
        Object.keys(component),
      );
    }
  }
  const hostFiber = findCurrentHostFiber(fiber);
  if (hostFiber === null) {
    return null;
  }
  return hostFiber.stateNode;
}

findHostInstanceByFiber(fiber: Fiber): Instance | TextInstance | null {
      const hostFiber = findCurrentHostFiber(fiber);
      if (hostFiber === null) {
        return null;
      }
      return hostFiber.stateNode;
    },
    findFiberByHostInstance(instance: Instance | TextInstance): Fiber | null {