Interface ReactDOMElement

package/src/utils/source-location.ts:106–115

* Extended HTMLElement with React fiber properties

 * Extended HTMLElement with React fiber properties
 */
interface ReactDOMElement extends HTMLElement {
  // React 16-17 fiber key
  __reactFiber$?: string;
  // React 18+ fiber key pattern
  __reactFiber?: ReactFiber;
  // React internal instance (older pattern)
  __reactInternalInstance$?: string;
  // Alternative patterns
  _reactRootContainer?: unknown;
}

// React fiber tag constants (for reference)
const FIBER_TAGS = {