/** Whether a person is at the keyboard, as opposed to a pipe, an agent or CI. */
export declare function isInteractive(): boolean;
/** One line of answer, trimmed. The question is written to stderr. */
export declare function askOnStdin(question: string): Promise<string>;
/**
 * `y` / `yes`, case-insensitive. Everything else is no — including an empty line, so
 * hitting return on a `[y/N]` prompt declines rather than spends.
 */
export declare function isAffirmative(answer: string): boolean;