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export default (function (o, c) {
  var proto = c.prototype;

  proto.weekday = function (input) {
    var weekStart = this.$locale().weekStart || 0;
    var $W = this.$W;
    var weekday = ($W < weekStart ? $W + 7 : $W) - weekStart;

    if (this.$utils().u(input)) {
      return weekday;
    }

    return this.subtract(weekday, 'day').add(input, 'day');
  };
});