/**
 * Promise deferred primitive — lets external code resolve or reject
 * a promise. Used by RoomCoordinator for host→joiners handoff.
 */

export interface Deferred<T> {
  promise: Promise<T>;
  resolve(value: T): void;
  reject(error: unknown): void;
}

export function deferred<T>(): Deferred<T> {
  let resolve!: (value: T) => void;
  let reject!: (error: unknown) => void;
  const promise = new Promise<T>((res, rej) => {
    resolve = res;
    reject = rej;
  });
  return { promise, resolve, reject };
}