text: 'use strict';
  
  var toInteger = require('./_lib/toInteger/index');
  var addYears = require('./addYears');
  
  /**
   * @name subYears
   * @category Year Helpers
   * @summary Subtract the specified number of years from the given date.
   *
   * @description
   * Subtract the specified number of years from the given 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).
   *
   * @param {Date|number} dirtyDate - the date to be changed
   * @param {number} dirtyAmount - the amount of years to be subtracted
   * @returns {Date} the new date with the years subtracted
   * @throws {TypeError} 2 arguments required
   *
   * @example
   * // Subtract 5 years from 1 September 2014:
   * var result = subYears(new Date(2014, 8, 1), 5)
   * //=> Tue Sep 01 2009 00:00:00
   */
  module.exports = function subYears(dirtyDate, dirtyAmount) {
      if (arguments.length < 2) {
          throw new TypeError(
              '2 arguments required, but only ' + arguments.length + ' present'
          );
      }
  
      var amount = toInteger(dirtyAmount);
      return addYears(dirtyDate, -amount);
  };
  