/**
 * Keeps prop overrides across reloads for the browser extension, whose page
 * runtime must not write the site's own storage. The overrides live in the
 * extension's `chrome.storage.session`, which only the ISOLATED world's relay
 * can reach (through the background), so the store here holds them in memory
 * and talks to the relay over `window.postMessage`:
 *
 * - on install it asks for the saved overrides (`want`); the relay answers
 *   with `seed` once the background has read them, and also sends `seed`
 *   unasked as soon as it has them, since either script may load first;
 * - every save goes out as `save`, the whole store as JSON, for the relay to
 *   hand to the background.
 *
 * The background keys them by the page's origin, from the sender the browser
 * reports, not from anything the page says.
 */
/** Install the override store over the relay on `target`. */
export declare const installWindowOverrideStore: (target?: Window) => void;
//# sourceMappingURL=window-override-storage.d.ts.map