import crypto from 'crypto';
import * as RequestHandler from './default-http-request-handler';
import type { PublicKey } from './jwt-utils/decode-validators';
export type PublicKeys = Record<string, Record<string, string | Buffer | PublicKey | crypto.KeyObject>>;
export interface JwkOptions {
    expiresSkew?: number;
    defaultAlgorithms?: string[];
}
export type FormattedPublicKeys = Record<string, PublicKey>;
export declare class PubkeysHelper {
    private requestHandler;
    constructor(httpRequestHandler?: RequestHandler.HttpRequestHandler);
    static fetchJwkKeys(url: string, options?: JwkOptions): Promise<FormattedPublicKeys | null>;
    private static formatPublicKeys;
    private static fetchJwkKeysImpl;
    fetchJwkKeys(url: string, options?: JwkOptions): Promise<FormattedPublicKeys | null>;
}