/**
 * TTY detection for TUI mode
 */
/**
 * Error thrown when TTY is required but not available
 */
export declare class TTYError extends Error {
    readonly exitCode = 1;
    constructor(message: string);
}
/**
 * Check if the current environment is a TTY
 *
 * Throws TTYError if stdin or stdout is not a TTY,
 * which means TUI mode cannot be used.
 *
 * @throws {TTYError} If not running in a TTY
 */
export declare function checkTTY(): void;
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