/**
 * Output formatting for the CLI.
 */
export declare function setJsonMode(enabled: boolean): void;
export declare function isJsonMode(): boolean;
/** Print data — as JSON if --json flag, otherwise as formatted text. */
export declare function output(data: unknown, formatted?: string): void;
/** Print a simple table to the terminal. */
export declare function printTable(headers: string[], rows: string[][]): void;
/** Print an error and exit. */
export declare function die(msg: string): never;
/** Truncate a string. */
export declare function truncate(text: string, max: number): string;