interface PushOptions {
    /**
     * Either to convert the push object into a base64 string
     * @default true
     */
    base64?: boolean;
    /**
     * Either to start subscribing, when the user is visible
     * @default true
     */
    user_visible_only?: boolean;
}
declare type base64 = string;
export declare function push(sw_url: string, vapid: base64, options?: PushOptions): {
    result: import("svelte/store").Writable<string | PushSubscription>;
    is_supported: import("svelte/store").Readable<boolean>;
};
export {};