!(function (e, t) {
    if ('object' == typeof exports && 'undefined' != typeof module) {
        module.exports = t();
    } else {
        if ('function' == typeof define && define.amd) {
            define(t);
        } else {
            (e = 'undefined' != typeof globalThis ? globalThis : e || self).dayjs_plugin_isoWeek = t();
        }
    }
})(this, function () {
    'use strict';

    var e = 'day';
    return function (t, i, s) {
        var a = function (t) {
            return t.add(4 - t.isoWeekday(), e);
        };
        var d = i.prototype;
        d.isoWeekYear = function () {
            return a(this).year();
        };
        d.isoWeek = function (t) {
            if (!this.$utils().u(t)) {
                return this.add(7 * (t - this.isoWeek()), e);
            }
            var i;
            var d;
            var n;
            var o;
            var r = a(this);
            var u =
                ((i = this.isoWeekYear()), (d = this.$u), (n = (d ? s.utc : s)().year(i).startOf('year')), (o = 4 - n.isoWeekday()), n.isoWeekday() > 4 && (o += 7), n.add(o, e));
            return r.diff(u, 'week') + 1;
        };
        d.isoWeekday = function (e) {
            return this.$utils().u(e) ? this.day() || 7 : this.day(this.day() % 7 ? e : e - 7);
        };
        var n = d.startOf;
        d.startOf = function (e, t) {
            var i = this.$utils();
            var s = !!i.u(t) || t;
            return 'isoweek' === i.p(e)
                ? s
                    ? this.date(this.date() - (this.isoWeekday() - 1)).startOf('day')
                    : this.date(this.date() - 1 - (this.isoWeekday() - 1) + 7).endOf('day')
                : n.bind(this)(e, t);
        };
    };
});