import type { RelativeRoundingMethod } from "../../types/index.js";
type RelativeUnit = "year" | "month" | "week" | "day" | "hour" | "minute" | "second";
export interface FormatRelativeDateTimeOptions {
    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-time and a reference date-time.
 *
 * - Auto-picks the display unit (second through year) based on the distance, unless
 *   `largestUnit` forces one.
 * - `roundingMethod` controls how the distance rounds to the display unit.
 *
 * @param value ISO date-time 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 formatRelativeDateTime("2026-03-17T09:00:00", "en-GB", { style: "long" }) // "in 3 hours"
 * @example formatRelativeDateTime(value, "en-US", { roundingMethod: "floor" }) // rounds toward the earlier boundary
 * @example formatRelativeDateTime("not-a-date") // ""
 */
export declare function formatRelativeDateTime(value: string, locale?: string, options?: FormatRelativeDateTimeOptions): string;
export {};