Fix bigint & HTMLElement serialization

[davidkpiano]

No description provided.

[jwyoo]

Performance improvement issues, but performance problems still exist.

function deepCopyAndPrepareForSafeStringify(
  obj: any,
  hash = new WeakMap()
): any {
  // check circular
  if (hash.has(obj)) {
    return hash.get(obj);
  }

  if (typeof obj === "bigint") {
    return { type: "bigint", value: obj.toString() };
  }

  if (obj === null || typeof obj !== "object") {
    return obj;
  }

  if (obj instanceof HTMLElement) {
    const element = {
      tag: obj.tagName,
      outerHTML: obj.outerHTML,
    };
    hash.set(obj, element);
    return element;
  }

  if (Object.prototype.hasOwnProperty.call(obj, "toJSON")) {
    const json = obj.toJSON();
    for (const key in json) {
      json[key] = deepCopyAndPrepareForSafeStringify(json[key], hash);
    }
    hash.set(obj, json);
    return json;
  }

  const copy = Array.isArray(obj)
    ? ([] as any[])
    : ({ __proto__: obj.__proto__ } as any);
  hash.set(obj, copy);
  for (const key in obj) {
    if (Object.prototype.hasOwnProperty.call(obj, key)) {
      copy[key] = deepCopyAndPrepareForSafeStringify(obj[key], hash);
    }
  }
  return copy;
}