/**
 * How to reach the local UI from where the admin is sitting. On a machine with a desktop, open
 * the URL; over SSH or on a headless server, forward the port from the admin's own computer
 * first. The UI binds 127.0.0.1 only and checks the Host header, so the local port must equal
 * the remote one.
 */
/** Over SSH, or Linux with no display server: a browser here would show nothing to the admin. */
export declare function isHeadless(platform?: NodeJS.Platform, env?: NodeJS.ProcessEnv): boolean;
/** Who to SSH in as, and where; `sshPort` only when it is not 22. */
export interface SshLogin {
    user: string;
    host: string;
    sshPort?: number;
}
/** The lines telling the admin how to open the UI at `port`. */
export declare function uiAccessLines(port: number, headless: boolean, who?: SshLogin): string[];
/**
 * Over SSH, the server address and port the admin's client connected to (`SSH_CONNECTION` is
 * "client-ip client-port server-ip server-port"): a VPS's hostname rarely resolves from the
 * admin's computer, the address they just reached does. Otherwise this machine's hostname.
 */
export declare function currentLogin(env?: NodeJS.ProcessEnv): SshLogin;