Function findDebugSourceReact19

package/src/utils/source-location.ts:322–377

* Attempts to find source location using React 19's potentially different structure * * @param fiber - Starting fiber node * @returns Source location info or null

(
  fiber: ReactFiber
)

 * @returns Source location info or null
 */
function findDebugSourceReact19(
  fiber: ReactFiber
): { source: ReactFiber["_debugSource"]; componentName: string | null } | null {
  // React 19 may store debug info differently
  // This is a forward-compatible attempt based on React 19 RFCs

  let current: ReactFiber | null | undefined = fiber;
  let depth = 0;
  const maxDepth = 50;

  while (current && depth < maxDepth) {
    // Check for new React 19 debug patterns
    const anyFiber = current as unknown as Record<string, unknown>;

    // Possible React 19 locations for debug info
    const possibleSourceKeys = [
      "_debugSource",
      "__source",
      "_source",
      "debugSource",
    ];

    for (const key of possibleSourceKeys) {
      const source = anyFiber[key];
      if (source && typeof source === "object" && "fileName" in source) {
        return {
          source: source as ReactFiber["_debugSource"],
          componentName: getComponentName(current),
        };
      }
    }

    // Check if debug info is in the element itself
    if (current.memoizedProps) {
      const props = current.memoizedProps as Record<string, unknown>;
      if (props.__source && typeof props.__source === "object") {
        const source = props.__source as { fileName?: string; lineNumber?: number };
        if (source.fileName && source.lineNumber) {
          return {
            source: {
              fileName: source.fileName,
              lineNumber: source.lineNumber,
              columnNumber: (source as { columnNumber?: number }).columnNumber,
            },
            componentName: getComponentName(current),
          };
        }
      }
    }

    current = current.return;
    depth++;
  }

  return null;
}

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