import type { $Chronos, ChronosInput, TimeUnit } from '../types';
declare module '../Chronos' {
    interface Chronos {
        /**
         * @instance Returns the number of full years between the input date and the current instance.
         * @param time Optional time to compare with the `Chronos` date/time. Defaults to current time.
         * @returns The difference in number, negative if past, positive if future.
         */
        getRelativeYear(time?: ChronosInput): number;
        /**
         * @instance Returns the number of full months between the input date and the current instance.
         * @param time Optional time to compare with the `Chronos` date/time. Defaults to current time.
         * @returns The difference in number, negative if past, positive if future.
         */
        getRelativeMonth(time?: ChronosInput): number;
        /**
         * @instance Determines how many full weeks apart the input date is from the `Chronos` instance.
         * @param time Optional time to compare with the `Chronos` date/time. Defaults to current time.
         * @returns The difference in number, negative if past, positive if future.
         */
        getRelativeWeek(time?: ChronosInput): number;
        /**
         * @instance Returns the number of full days between the input date and the current instance.
         * @param time Optional time to compare with the `Chronos` date/time. Defaults to current time.
         * @returns The difference in number, negative if past, positive if future.
         */
        getRelativeDay(time?: ChronosInput): number;
        /**
         * @instance Determines how many full hours apart the input date is from the `Chronos` instance.
         * @param time Optional time to compare with the `Chronos` date/time. Defaults to current time.
         * @returns The difference in number, negative if past, positive if future.
         */
        getRelativeHour(time?: ChronosInput): number;
        /**
         * @instance Returns the number of full minutes between the input date and the current instance.
         * @param time Optional time to compare with the `Chronos` date/time. Defaults to current time.
         * @returns The difference in number, negative if past, positive if future.
         */
        getRelativeMinute(time?: ChronosInput): number;
        /**
         * @instance Returns the number of full seconds between the input date and the current instance.
         * @param time Optional time to compare with the `Chronos` date/time. Defaults to current time.
         * @returns The difference in number, negative if past, positive if future.
         */
        getRelativeSecond(time?: ChronosInput): number;
        /**
         * @instance Returns the number of milliseconds between the input date and the current instance.
         * @param time Optional time to compare with the `Chronos` date/time. Defaults to current time.
         * @returns The difference in number, negative if past, positive if future.
         */
        getRelativeMilliSecond(time?: ChronosInput): number;
        /**
         * @instance Compares the stored date with the current instance, returning the relative difference in the specified unit.
         *
         * @remarks
         * - Internally uses {@link getRelativeYear}, {@link getRelativeMonth}, {@link getRelativeWeek}, {@link getRelativeDay}, {@link getRelativeHour}, {@link getRelativeMinute}, {@link getRelativeSecond} and {@link getRelativeMilliSecond} and rounds the result.
         * - To calculate accurate difference use {@link diff} method.
         *
         * @param unit The time unit to compare by. Defaults to `'minute'`.
         * @param time Optional time to compare with the `Chronos` date/time. Defaults to current time.
         * @returns The difference in number, negative if past, positive if future.
         */
        compare(unit?: TimeUnit, time?: ChronosInput): number;
        /** @instance Checks if the current date is today. */
        isToday(): boolean;
        /** @instance Checks if the current date is tomorrow. */
        isTomorrow(): boolean;
        /** @instance Checks if the current date is yesterday. */
        isYesterday(): boolean;
    }
}
/** * Plugin to inject `relative time` related methods */
export declare const relativeTimePlugin: ($Chronos: $Chronos) => void;