/** Returns the known hosts content in SSH known_hosts format. */
export declare function getKnownHostsContent(): string;
/**
 * Ensures that the mittwald known_hosts file exists and is up-to-date. Returns
 * the path to the file.
 *
 * @param configDir The oclif config directory (typically ~/.config/mw on
 *   Linux/macOS)
 */
export declare function ensureKnownHostsFile(configDir: string): string;
/**
 * Returns SSH command-line options to use the embedded known hosts.
 *
 * These options configure SSH to use our embedded known hosts file as a
 * "global" known hosts file, which is checked in addition to the user's own
 * ~/.ssh/known_hosts file.
 *
 * @param configDir The oclif config directory (typically ~/.config/mw on
 *   Linux/macOS)
 */
export declare function getSSHKnownHostsFlags(configDir: string): string[];
/**
 * Returns the SSH options string for use with rsync's --rsh flag or scp.
 *
 * @example
 *   // For rsync:
 *   `--rsh "ssh ${getSSHKnownHostsArgsString(configDir)}"`;
 *
 * @example
 *   // For scp:
 *   `scp ${getSSHKnownHostsArgsString(configDir)} source dest`;
 *
 * @param configDir The oclif config directory (typically ~/.config/mw on
 *   Linux/macOS)
 */
export declare function getSSHKnownHostsArgsString(configDir: string): string;