| 12345678910111213141516171819 | export default (function (o, c) {  var proto = c.prototype;  proto.weekYear = function () {    var month = this.month();    var weekOfYear = this.week();    var year = this.year();    if (weekOfYear === 1 && month === 11) {      return year + 1;    }    if (month === 0 && weekOfYear >= 52) {      return year - 1;    }    return year;  };});
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