export function getAtPath(obj: unknown, path: string): unknown {
  if (obj == null) return undefined;
  // Split "a.b[0].c" -> ['a','b','0','c']
  const segments = path.replace(/\[(\d+)\]/g, '.$1').split('.').filter(Boolean);
  let cur: unknown = obj;
  for (const seg of segments) {
    if (cur == null || typeof cur !== 'object') return undefined;
    cur = (cur as Record<string, unknown>)[seg];
  }
  return cur;
}