/**
 * Timestamp formatting for message display.
 *
 * Formats:
 * - "time-date-iso":  10:34 2025-03-24    (default)
 * - "date-time-iso":  2025-03-24 10:34
 * - "time-date-us":   10:34 AM 03/24/2025
 * - "date-time-us":   03/24/2025 10:34 AM
 */
export type TimestampFormat = "date-time-iso" | "date-time-us";
/**
 * Format a timestamp for message display using the specified format.
 */
export declare function formatTimestamp(timestamp: number, format?: TimestampFormat): string;
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