import type { RelativeRoundingMethod } from "../../types/index.js";
type RelativeUnit = "year" | "month" | "week" | "day";
export interface FormatRelativeDateOptions {
    style?: "long" | "short" | "narrow";
    numeric?: "always" | "auto";
    largestUnit?: RelativeUnit;
    /**
     * How the computed distance rounds to the display unit: "floor" rounds toward the
     * earlier boundary, "ceil" toward the later boundary, "round" (default) to the nearest —
     * matches current behavior when omitted.
     */
    roundingMethod?: RelativeRoundingMethod;
    reference?: string;
}
/**
 * Format the relative time between a plain date and a reference date.
 *
 * - Auto-picks the display unit (day/week/month/year) based on the distance, unless
 *   `largestUnit` forces one.
 * - `roundingMethod` controls how the distance rounds to the display unit.
 *
 * @param value ISO date string to format
 * @param locale optional: BCP 47 locale tag
 * @param options optional: { style, numeric, largestUnit, roundingMethod, reference }
 * @returns the formatted relative-time string, or "" on invalid input
 *
 * @example formatRelativeDate("2026-01-15", "en-US", { reference: "2026-04-15" }) // "3 months ago"
 * @example formatRelativeDate(value, "en-US", { roundingMethod: "floor" }) // rounds toward the earlier boundary
 * @example formatRelativeDate("not-a-date") // ""
 */
export declare function formatRelativeDate(value: string, locale?: string, options?: FormatRelativeDateOptions): string;
export {};