import { VapidDetails } from '../types/web-push';
export declare const getGCMAPIKey: () => string;
export declare const setGCMAPIKey: (apiKey: string | null) => void;
export declare const getVapidDetails: () => VapidDetails | null;
export declare const setVapidDetails: (subject: string | null, publicKey: string, privateKey: string) => void;