(() => {
  const result = [];
  const seen = new Set();
  function walk(path, object, depth) {
    if (
      object === null ||
      (typeof object !== "object" && typeof object !== "function") ||
      seen.has(object) || depth > 3
    ) return;
    seen.add(object);
    const prototype = Object.getPrototypeOf(object);
    result.push(JSON.stringify([
      path,
      Object.isExtensible(object),
      Object.isFrozen(object),
      prototype === null ? null : prototype.constructor?.name,
    ]));
    const keys = Reflect.ownKeys(object).map((key) => [key, String(key)]);
    keys.sort((a, b) => a[1] < b[1] ? -1 : a[1] > b[1] ? 1 : 0);
    for (const [key, name] of keys) {
      const descriptor = Object.getOwnPropertyDescriptor(object, key);
      const child = `${path}.${name}`;
      result.push(JSON.stringify([
        child,
        descriptor.enumerable,
        descriptor.configurable,
        "value" in descriptor
          ? [
            descriptor.value === null ? "null" : typeof descriptor.value,
            descriptor.writable,
          ]
          : [typeof descriptor.get, typeof descriptor.set],
      ]));
      if ("value" in descriptor) walk(child, descriptor.value, depth + 1);
    }
  }
  walk("globalThis", globalThis, 0);
  result.push(`globalEventTarget: ${globalThis instanceof EventTarget}`);
  let dispatched = false;
  const listener = () => dispatched = true;
  addEventListener("snapshot-surface", listener, { once: true });
  dispatchEvent(new Event("snapshot-surface"));
  result.push(`globalDispatch: ${dispatched}`);
  return result;
})();