/**
 * Output data as JSON (if --json flag is set) or do nothing and let
 * the calling command handle human-friendly rendering.
 */
export declare function output(data: unknown, opts: {
    json?: boolean;
}): void;
/** Check whether JSON output mode is active. */
export declare function isJsonMode(options: {
    json?: boolean;
}): boolean;
/** Print a success message with a green checkmark. */
export declare function printSuccess(message: string): void;
/** Print an error message with a red X. */
export declare function printError(message: string): void;
/** Print a next-step hint with a dim prefix. */
export declare function printHint(message: string): void;