Function findNodeHandle

packages/react-native-renderer/src/ReactNativePublicCompat.js:91–160

(componentOrHandle: any)

}

export function findNodeHandle(componentOrHandle: any): ?number {
  if (__DEV__) {
    const owner = currentOwner;
    if (owner !== null && isRendering && owner.stateNode !== null) {
      if (!owner.stateNode._warnedAboutRefsInRender) {
        console.error(
          '%s is accessing findNodeHandle inside its render(). ' +
            'render() should be a pure function of props and state. It should ' +
            'never access something that requires stale data from the previous ' +
            'render, such as refs. Move this logic to componentDidMount and ' +
            'componentDidUpdate instead.',
          getComponentNameFromType(owner.type) || 'A component',
        );
      }

      owner.stateNode._warnedAboutRefsInRender = true;
    }
  }

  if (componentOrHandle == null) {
    return null;
  }

  if (typeof componentOrHandle === 'number') {
    // Already a node handle
    return componentOrHandle;
  }

  // For compatibility with legacy renderer instances
  if (componentOrHandle._nativeTag) {
    return componentOrHandle._nativeTag;
  }

  // For compatibility with Fabric instances
  if (
    componentOrHandle.canonical != null &&
    componentOrHandle.canonical.nativeTag != null
  ) {
    return componentOrHandle.canonical.nativeTag;
  }

  // For compatibility with Fabric public instances
  const nativeTag = getNativeTagFromPublicInstance(componentOrHandle);
  if (nativeTag) {
    return nativeTag;
  }

  let hostInstance;
  if (__DEV__) {
    hostInstance = findHostInstanceWithWarning(
      componentOrHandle,
      'findNodeHandle',
    );
  } else {
    hostInstance = findHostInstance(componentOrHandle);
  }

  if (hostInstance == null) {