import type { ComPlainDate } from "../PlainDate.js";
/**
 * Jump to January 1 of a plain-date's year.
 *
 * @param date A plain-date
 * @returns A new plain-date that is the 1st day of the given plain-date's year
 */
export declare function startOfYear<T extends ComPlainDate>(date: T): T;
//# sourceMappingURL=startOfYear.d.ts.map