/**
 * Window-based provider.
 *
 * Implements the Provider interface targeting a Window reference,
 * using `window.postMessage` for bidirectional communication.
 *
 * Accepts either a direct Window reference or a Promise that resolves
 * to one (e.g. when the iframe hasn't loaded yet). Messages sent before
 * the promise resolves are delivered once the window becomes available.
 */
import type { Provider } from "./provider.js";
export declare function createWindowProvider(targetOrPromise: Window | Promise<Window>): Provider;
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