/**
 * Verifies ACME challenges by making HTTP requests or DNS lookups.
 */
export declare class ChallengeVerifier {
    private verificationEnabled;
    constructor(verificationEnabled?: boolean);
    /**
     * Verify an HTTP-01 challenge by fetching the token from the domain.
     */
    verifyHttp01(domain: string, token: string, expectedKeyAuth: string): Promise<boolean>;
    /**
     * Verify a DNS-01 challenge by looking up the TXT record.
     */
    verifyDns01(domain: string, expectedHash: string): Promise<boolean>;
    private httpGet;
}