If class name in class expression equals to variable name Consulo displays "Duplicate declaration" error #47

/**
 * Форматирование даты в стиле Java SimpleDateFormat.
 */
class DateFormatter
{
    constructor()
    {
        const DateMacro = class DateMacro
        {
            constructor(macro, leadingChars, dateFunc)
            {
                this.macro = macro;
                this.leadingChars = leadingChars;
                this.dateFunc = dateFunc;
            }

            pad(value)
            {
                const len = value.length, minLen = this.leadingChars.length;
                return (len >= minLen) ? value : this.leadingChars.substring(len) + value;
            }

            replace(pattern, date)
            {
                if (pattern.indexOf(this.macro) < 0) return pattern;
                const value = this.pad("" + this.dateFunc(date));
                return pattern.replace(this.macro, value);
            }
        };

        this.macros = [
            new DateMacro("yyyy", "0000", date => date.getFullYear()),
            new DateMacro("yy", "00", date => date.getFullYear() % 100),
            new DateMacro("MM", "00", date => date.getMonth() + 1),
            new DateMacro("M", "0", date => date.getMonth() + 1),
            new DateMacro("dd", "00", date => date.getDate()),
            new DateMacro("d", "0", date => date.getDate()),
            new DateMacro("HH", "00", date => date.getHours()),
            new DateMacro("H", "0", date => date.getHours()),
            new DateMacro("mm", "00", date => date.getMinutes()),
            new DateMacro("m", "0", date => date.getMinutes()),
            new DateMacro("ss", "00", date => date.getSeconds()),
            new DateMacro("s", "0", date => date.getSeconds()),
            new DateMacro("SSS", "000", date => date.getMilliseconds()),
            new DateMacro("S", "0", date => date.getMilliseconds())
        ];
    }

    format(date, format)
    {
        let result = format;
        for (const macro of this.macros) result = macro.replace(result, date);
        return result;
    }
}

DateFormatter.instance = new DateFormatter();

Date.prototype.format = function (format) { return DateFormatter.instance.format(this, format); };