export type SSLCertificate = {
    serialNumber: string;
    issuer: {
        C: string;
        O: string;
        CN: string;
    };
    subject: {
        CN: string;
        C: string;
        O: string;
    };
    valid_to: string;
    valid_from: string;
    bits: number;
};
export declare function getSSLCertificate(url: string, timeout?: number): Promise<SSLCertificate>;