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/**
* @name lastDayOfDecade
* @category Decade Helpers
* @summary Return the last day of a decade for the given date.
*
* @description
* Return the last day of a decade for the given date.
*
* @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
*
* @param date - The original date
*
* @returns The last day of a decade
*
* @example
* // The last day of a decade for 21 December 2012 21:12:00:
* const result = lastDayOfDecade(new Date(2012, 11, 21, 21, 12, 00))
* //=> Wed Dec 31 2019 00:00:00
*/
export declare function lastDayOfDecade<DateType extends Date>(
date: DateType | number | string,
): DateType;