/**
 * Parent-side recovery when the embed document loads but never posts
 * `IFRAME_READY` (stale HTML naming a deleted entry chunk, HTML 404
 * body instead of JS, etc.).
 *
 * Clock starts on iframe `load` — not at mount — so a slow download is
 * not treated as a failed handshake. After load, wait
 * {@link HANDSHAKE_RELOAD_GRACE_MS} for READY, then rewrite `src` once
 * with {@link HANDSHAKE_RELOAD_PARAM} so the next document is a real
 * navigation (same-src assignment is unreliable).
 */
export declare const HANDSHAKE_RELOAD_PARAM = "amosReload";
export declare const HANDSHAKE_RELOAD_GRACE_MS = 1500;
export declare function withHandshakeReloadParam(src: string, timestamp?: number): string;
/**
 * Arm a one-shot handshake reload on `iframe`.
 *
 * Attach **before** inserting the iframe into the document so the
 * `load` event is not missed. Call `noteReady()` from the `IFRAME_READY`
 * handler and `cancel()` from `destroy()`.
 */
export declare function armIframeHandshakeReload(iframe: HTMLIFrameElement, options?: {
    onBeforeReload?: () => void;
}): {
    noteReady: () => void;
    cancel: () => void;
};