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