/**
 * Interactive vs headless detection.
 *
 * Humans get prompts; agents and CI must run headless — every value comes from
 * a flag and the CLI never blocks on a prompt. Headless is forced by
 * APSO_NONINTERACTIVE=1, by CI=true, or auto-detected when stdin/stdout is not
 * a TTY (e.g. an agent capturing output). Commands should check `isInteractive()`
 * and, when false, require the equivalent flag instead of prompting.
 */
export declare function isInteractive(): boolean;
/**
 * Message for a missing required value in headless mode. Name the flag that
 * would have supplied it so an agent can retry deterministically.
 */
export declare function missingFlag(details: string): string;