/**
 * @module Internal
 */
/// <reference types="node" />
export declare type CAOptions = HttpsOptions | HttpsPathOptions;
export declare type HttpsOptions = {
    key: string;
    cert: string;
};
export declare type HttpsPathOptions = {
    keyPath: string;
    certPath: string;
};
export declare type PEM = string | string[] | Buffer | Buffer[];
export declare type GeneratedCertificate = {
    key: string;
    cert: string;
    ca: string;
};
export declare function getCA(options: CAOptions): Promise<CA>;
export declare class CA {
    private static readonly KEYS;
    private caCert;
    private caKey;
    private certCache;
    constructor(caKey: PEM, caCert: PEM);
    generateCertificate(domain: string): GeneratedCertificate;
}