Hooks like `useEffect` or `useLayoutEffect` will _never_ have names, so if a the only hooks for a given source file are these "unnamed" built-in hooks, we should skip loading the source code.
}
        } else {
          if (sourceMappingURLs.length > 1) {
            console.warn(
              'More than one external source map detected in the source file',
            );
          }
          let url = sourceMappingURLs[i].split('=')[1];
          if (!url.startsWith('http') && !url.startsWith('/')) {
            
            const lastSlashIdx = runtimeSourceURL.lastIndexOf('/');
            if (lastSlashIdx !== -1) {
              const baseURL = runtimeSourceURL.slice(
                0,
                runtimeSourceURL.lastIndexOf('/'),
              );
              url = `${baseURL}/${url}`;
            }
          }
          hookSourceData.sourceMapURL = url;
          const fetchPromise =
            fetchPromises.get(url) ||
            fetchFile(url).then(
              sourceMapContents =>
                new SourceMapConsumer(JSON.parse(sourceMapContents)),
            );
          if (__DEBUG__) {
            if (!fetchPromises.has(url)) {
              console.log(
                `extractAndLoadSourceMaps() External source map "${url}"`,