/** True when the caller asked for JSON, from either the global or local flag. */
export declare function jsonRequested(globalJson: unknown, localJson?: unknown): boolean;
/** Print one JSON object to stdout, pretty-printed so a human can read it too. */
export declare function emitJson(value: unknown): void;
/**
 * Report a recoverable error the way an agent can consume it: a JSON envelope
 * on stdout when `--json`, a clean `error:` line on stderr otherwise, and a
 * non-zero exit either way. Never throws, so callers can `return` right after.
 */
export declare function failJson(json: boolean, message: string, extra?: Record<string, unknown>): void;
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