/**
 * @name subBusinessDays
 * @category Day Helpers
 * @summary Substract the specified number of business days (mon - fri) to the given date.
 *
 * @description
 * Substract the specified number of business days (mon - fri) to the given date, ignoring weekends.
 *
 * @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 date to be changed
 * @param amount - The amount of business days to be subtracted.
 *
 * @returns The new date with the business days subtracted
 *
 * @example
 * // Substract 10 business days from 1 September 2014:
 * const result = subBusinessDays(new Date(2014, 8, 1), 10)
 * //=> Mon Aug 18 2014 00:00:00 (skipped weekend days)
 */
export declare function subBusinessDays<DateType extends Date>(
  date: DateType | number | string,
  amount: number,
): DateType;