function groupByRange(numbers: number[], rangeSize: number): Record<string, number[]> {
  if(numbers.length === 0) return {}
  const mapp = new Map<string, number[]>();
  for(const num of numbers) {
    const toIndex = Math.floor(num/rangeSize);
    const limMin = toIndex * rangeSize;
    const limMax = (toIndex + 1) * rangeSize;
    const tag = `${limMin}-${limMax}`;
    const currValues = mapp.get(tag) || [];
    mapp.set(tag, [...currValues, num]);
  }

  // Escribe tu solución aquí
  return Object.fromEntries(mapp);
}

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