text: import toInteger from '../_lib/toInteger/index.js'
  import addISOWeekYears from '../addISOWeekYears/index.js'
  import requiredArgs from '../_lib/requiredArgs/index.js'
  
  /**
   * @name subISOWeekYears
   * @category ISO Week-Numbering Year Helpers
   * @summary Subtract the specified number of ISO week-numbering years from the given date.
   *
   * @description
   * Subtract the specified number of ISO week-numbering years from the given date.
   *
   * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
   *
   * ### v2.0.0 breaking changes:
   *
   * - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
   *
   * - The function was renamed from `subISOYears` to `subISOWeekYears`.
   *   "ISO week year" is short for [ISO week-numbering year](https://en.wikipedia.org/wiki/ISO_week_date).
   *   This change makes the name consistent with
   *   locale-dependent week-numbering year helpers, e.g., `setWeekYear`.
   *
   * @param {Date|Number} date - the date to be changed
   * @param {Number} amount - the amount of ISO week-numbering years to be subtracted
   * @returns {Date} the new date with the ISO week-numbering years subtracted
   * @throws {TypeError} 2 arguments required
   *
   * @example
   * // Subtract 5 ISO week-numbering years from 1 September 2014:
   * var result = subISOWeekYears(new Date(2014, 8, 1), 5)
   * //=> Mon Aug 31 2009 00:00:00
   */
  export default function subISOWeekYears(dirtyDate, dirtyAmount) {
    requiredArgs(2, arguments)
  
    var amount = toInteger(dirtyAmount)
    return addISOWeekYears(dirtyDate, -amount)
  }
  