import type { $Chronos, ChronosInput, DurationOptions, TimeDuration } from '../types';
declare module '../Chronos' {
    interface Chronos {
        /**
         * @instance Returns the full time duration breakdown between current input (start) and another time (to) as {@link TimeDuration} object.
         *
         * @remarks This method calculates the elapsed time difference (excludes the end day), if you need an inclusive calendar-style difference (counting both start and end days), adjust one day manually before calling `duration()`.
         *
         * @param toTime The time to compare with. Defaults to `now`.
         * @param absolute If true, returns all values as positive numbers. Defaults to `true`.
         * @returns An object of time units: `years`, `months`, `days`, `hours`, `minutes`, `seconds`, `milliseconds` ({@link TimeDuration}).
         */
        duration(toTime?: ChronosInput, absolute?: boolean): TimeDuration;
        /**
         * @instance Returns a human-readable formatted duration string between the current instance (start) and another time (to).
         *
         * @remarks This method calculates the elapsed time difference (excludes the end day), if you need an inclusive calendar-style difference (counting both start and end days), adjust one day manually before calling `durationString()`.
         *
         * @param options {@link DurationOptions} to format duration string, including the time to compare with.
         * @returns A formatted duration string, e.g. `"2 hours, 5 minutes"` or `"2h 5m"`.
         */
        durationString(options?: DurationOptions): string;
    }
}
/** * Plugin to inject `duration` related methods */
export declare const durationPlugin: ($Chronos: $Chronos) => void;