How to use the @js-joda/core.ChronoField.MONTH_OF_YEAR function in @js-joda/core

const month = ChronoField.MONTH_OF_YEAR.checkValidIntValue(fieldValues.get(ChronoField.MONTH_OF_YEAR));
                date = LocalDate.of(year, month, 8); // TODO: chrono.date(year, month, 8);
                const dateDow = this._localizedDayOfWeek(date, sow);
                const wom = this._range.checkValidIntValue(value, this);
                const weeks = wom - this._localizedWeekOfMonth(date, dateDow);
                days = weeks * 7 + (dow - dateDow);
            }
            date = date.plus(days, ChronoUnit.DAYS);
            if (resolverStyle === ResolverStyle.STRICT) {
                if (date.getLong(ChronoField.MONTH_OF_YEAR) !== fieldValues.get(ChronoField.MONTH_OF_YEAR)) {
                    throw new DateTimeException('Strict mode rejected date parsed to a different month');
                }
            }
            fieldValues.remove(this);
            fieldValues.remove(ChronoField.YEAR);
            fieldValues.remove(ChronoField.MONTH_OF_YEAR);
            fieldValues.remove(ChronoField.DAY_OF_WEEK);
            return date;
        } else if (this._rangeUnit === ChronoUnit.YEARS) {  // week-of-year
            const value = fieldValues.remove(this);
            let date = LocalDate.of(year, 1, 1); // TODO: chrono.date(year, 1, 1);
            let days;
            if (resolverStyle === ResolverStyle.LENIENT) {
                const dateDow = this._localizedDayOfWeek(date, sow);
                const weeks = value - this._localizedWeekOfYear(date, dateDow);
                days = weeks * 7 + (dow - dateDow);
            } else {
                const dateDow = this._localizedDayOfWeek(date, sow);
                const woy = this._range.checkValidIntValue(value, this);
                const weeks = woy - this._localizedWeekOfYear(date, dateDow);
                days = weeks * 7 + (dow - dateDow);
            }

}
            fieldValues.remove(this);
            fieldValues.remove(this._weekDef.weekOfWeekBasedYear());
            fieldValues.remove(ChronoField.DAY_OF_WEEK);
            return date;
        }

        if (fieldValues.containsKey(ChronoField.YEAR) === false) {
            return null;
        }
        const isoDow = ChronoField.DAY_OF_WEEK.checkValidIntValue(fieldValues.get(ChronoField.DAY_OF_WEEK));
        const dow = MathUtil.floorMod(isoDow - sow, 7) + 1;
        const year = ChronoField.YEAR.checkValidIntValue(fieldValues.get(ChronoField.YEAR));
        // const chrono = IsoChronology.INSTANCE; //TODO: Chronology.from(partialTemporal);  // defaults to ISO
        if (this._rangeUnit === ChronoUnit.MONTHS) {  // week-of-month
            if (fieldValues.containsKey(ChronoField.MONTH_OF_YEAR) === false) {
                return null;
            }
            const value = fieldValues.remove(this);
            let date;
            let days;
            if (resolverStyle === ResolverStyle.LENIENT) {
                const month = fieldValues.get(ChronoField.MONTH_OF_YEAR);
                date = LocalDate.of(year, 1, 1); // TODO: chrono.date(year, 1, 1);
                date = date.plus(month - 1, ChronoUnit.MONTHS);
                const dateDow = this._localizedDayOfWeek(date, sow);
                const weeks = value - this._localizedWeekOfMonth(date, dateDow);
                days = weeks * 7 + (dow - dateDow);
            } else {
                const month = ChronoField.MONTH_OF_YEAR.checkValidIntValue(fieldValues.get(ChronoField.MONTH_OF_YEAR));
                date = LocalDate.of(year, month, 8); // TODO: chrono.date(year, month, 8);
                const dateDow = this._localizedDayOfWeek(date, sow);

_createStore(field, locale) {
        Cldr.load(cldrData(`main/${locale.localeString()}/ca-gregorian.json`));
        const cldr = new Cldr(locale.localeString());
        if (field === ChronoField.MONTH_OF_YEAR) {
            const monthsData = cldr.main('dates/calendars/gregorian/months/format');
            const styleMap = {};
            let data = {};
            data[1] = monthsData.wide[1];
            data[2] = monthsData.wide[2];
            data[3] = monthsData.wide[3];
            data[4] = monthsData.wide[4];
            data[5] = monthsData.wide[5];
            data[6] = monthsData.wide[6];
            data[7] = monthsData.wide[7];
            data[8] = monthsData.wide[8];
            data[9] = monthsData.wide[9];
            data[10] = monthsData.wide[10];
            data[11] = monthsData.wide[11];
            data[12] = monthsData.wide[12];
            styleMap[TextStyle.FULL] = data;