Just stashing a proof-of-concept

clone.ts

const isPrimitive = (obj) => {
  if (typeof obj === 'number' || typeof obj === 'boolean' || typeof obj === 'string') return true;
  if (Number.isNaN(obj) || obj === null || obj === undefined) return true;
  return false;
}

const isIterable = (obj) => !isPrimitive(obj);

const clone = (obj) => {
  if (isIterable(obj)) {
    if (obj instanceof Map) {
      return new Map(Array.from(obj.entries()).map(entry => entry.map(clone)));
    } else if (obj instanceof Set) {
      return new Set(Array.from(obj.values()).map(clone));
    } else {
      const copy = {};
      for (const [key, value] of Object.entries(obj))
        copy[key] = clone(value);
      return copy;
    }
  } else {
    return obj;
  }
}