react-native-gesture-handler/lib/module/findNodeHandle.web.js

Declarative API exposing native platform touch and gesture system to React Native

import { isRNSVGElement } from './web/utils';
export default function findNodeHandle(viewRef) {
  // Old API assumes that child handler is HTMLElement.
  // However, if we nest handlers, we will get ref to another handler.
  // In that case, we want to recursively call findNodeHandle with new handler viewTag (which can also be ref to another handler).
  if ((viewRef === null || viewRef === void 0 ? void 0 : viewRef.viewTag) !== undefined) {
    return findNodeHandle(viewRef.viewTag);
  }

  if (viewRef instanceof Element) {
    if (viewRef.style.display === 'contents') {
      return findNodeHandle(viewRef.firstChild);
    }

    return viewRef;
  }

  if (isRNSVGElement(viewRef)) {
    return viewRef.elementRef.current;
  } // In new API, we receive ref object which `current` field points to  wrapper `div` with `display: contents;`.
  // We want to return the first descendant (in DFS order) that doesn't have this property.


  let element = viewRef === null || viewRef === void 0 ? void 0 : viewRef.current;

  while (element && element.style.display === 'contents') {
    element = element.firstChild;
  }

  return element;
}
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