export declare function registerServiceWorker(path?: string): Promise<ServiceWorkerRegistration | null>;
/**
 * Outcome of {@link subscribeToPush}. Deliberately discriminated instead of
 * `PushSubscription | null`: a broken VAPID key, a dead push service, or a
 * missing service worker must never be indistinguishable from the user
 * declining the permission prompt — a consumer reading `null` as "user said
 * no" would show a permanently dead Enable button with no trace of the real
 * problem.
 */
export type PushSubscribeResult = {
    status: 'subscribed';
    subscription: PushSubscription;
}
/** The browser has no service-worker/Push API support. */
 | {
    status: 'unsupported';
}
/** The user declined (or has previously blocked) the permission prompt. */
 | {
    status: 'denied';
}
/** An operational failure: malformed VAPID key, push service down, no service worker registered (ready timed out), … */
 | {
    status: 'error';
    error: unknown;
};
export declare function subscribeToPush(vapidPublicKey: string, options?: {
    /**
     * How long to wait for `serviceWorker.ready` before reporting an error.
     * `ready` never settles when no service worker is registered (worker file
     * 404s, `registerServiceWorker` never ran), which would otherwise hang the
     * caller forever. Default 10s.
     */
    readyTimeoutMs?: number;
}): Promise<PushSubscribeResult>;
export declare function unsubscribeFromPush(): Promise<void>;