export interface TimeAgoOptions {
    invalidValue?: string;
    locale?: Intl.LocalesArgument;
    now?: number;
}
/**
 * Formats a past timestamp as a compact relative label (e.g. "3 days ago").
 *
 * Invalid dates return `invalidValue` (default `"Unknown"`). Future dates
 * collapse to "now" because the helper only walks elapsed seconds.
 */
export declare function timeAgo(date: Date, options?: TimeAgoOptions): string;