export declare function formatJson(data: unknown): string;
/** Choose up to `max` scalar columns, preferring common fields. */
export declare function pickColumns(rows: Record<string, unknown>[], max?: number): string[];
export declare function formatTable(rows: Record<string, unknown>[], columns?: string[]): string;
export declare function formatKeyValues(obj: Record<string, unknown>, keys?: string[]): string;
/** Best-effort human render for an arbitrary API response. */
export declare function summarize(data: unknown): string;