function groupBy(items: Record<string, any>[], key: string): Record<string, Record<string, any>[]> {
  // Tu codigo aqui
  const groups : Record<string | number, T[]> = {};

  for (const item of items) {
    const groupKey = item[key] as unknown as string | number;
    if (!groups[groupKey]) groups[groupKey] = [];

    groups[groupKey].push(item);
  }

  return groups;
}

// No modificar: necesario para evaluar el resultado.
export { groupBy };