How to use the @fullcalendar/core.asRoughMs function in @fullcalendar/core

TimeGrid.prototype.renderSlatRowHtml = function (dateProfile) {
        var _a = this, dateEnv = _a.dateEnv, theme = _a.theme, isRtl = _a.isRtl;
        var html = '';
        var dayStart = startOfDay(dateProfile.renderRange.start);
        var slotTime = dateProfile.minTime;
        var slotIterator = createDuration(0);
        var slotDate; // will be on the view's first day, but we only care about its time
        var isLabeled;
        var axisHtml;
        // Calculate the time for each slot
        while (asRoughMs(slotTime) < asRoughMs(dateProfile.maxTime)) {
            slotDate = dateEnv.add(dayStart, slotTime);
            isLabeled = wholeDivideDurations(slotIterator, this.labelInterval) !== null;
            axisHtml =
                '' +
                    (isLabeled ?
                        '<span>' + // for matchCellWidths
                            htmlEscape(dateEnv.format(slotDate, this.labelFormat)) +
                            '</span>' :
                        '') +
                    '';
            html +=
                '' +
                    (!isRtl ? axisHtml : '') +
                    '' +

renderSlatRowHtml(dateProfile: DateProfile) {
    let { dateEnv, theme, isRtl } = this.context
    let html = ''
    let dayStart = startOfDay(dateProfile.renderRange.start)
    let slotTime = dateProfile.minTime
    let slotIterator = createDuration(0)
    let slotDate // will be on the view's first day, but we only care about its time
    let isLabeled
    let axisHtml

    // Calculate the time for each slot
    while (asRoughMs(slotTime) < asRoughMs(dateProfile.maxTime)) {
      slotDate = dateEnv.add(dayStart, slotTime)
      isLabeled = wholeDivideDurations(slotIterator, this.labelInterval) !== null

      axisHtml =
        '' +
          (isLabeled ?
            '<span>' + // for matchCellWidths
              htmlEscape(dateEnv.format(slotDate, this.labelFormat)) +
            '</span>' :
            ''
            ) +
        ''

      html +=
        '

computeTimeTop(duration: Duration) {
    let len = this.slatEls.length
    let dateProfile = this.props.dateProfile
    let slatCoverage = (duration.milliseconds - asRoughMs(dateProfile.minTime)) / asRoughMs(this.slotDuration) // floating-point value of # of slots covered
    let slatIndex
    let slatRemainder

    // compute a floating-point number for how many slats should be progressed through.
    // from 0 to number of slats (inclusive)
    // constrained because minTime/maxTime might be customized.
    slatCoverage = Math.max(0, slatCoverage)
    slatCoverage = Math.min(len, slatCoverage)

    // an integer index of the furthest whole slat
    // from 0 to number slats (*exclusive*, so len-1)
    slatIndex = Math.floor(slatCoverage)
    slatIndex = Math.min(slatIndex, len - 1)

    // how much further through the slatIndex slat (from 0.0-1.0) must be covered in addition.
    // could be 1.0 if slatCoverage is covering *all* the slots

TimeGrid.prototype.computeTimeTop = function (duration) {
        var len = this.slatEls.length;
        var dateProfile = this.props.dateProfile;
        var slatCoverage = (duration.milliseconds - asRoughMs(dateProfile.minTime)) / asRoughMs(this.slotDuration); // floating-point value of # of slots covered
        var slatIndex;
        var slatRemainder;
        // compute a floating-point number for how many slats should be progressed through.
        // from 0 to number of slats (inclusive)
        // constrained because minTime/maxTime might be customized.
        slatCoverage = Math.max(0, slatCoverage);
        slatCoverage = Math.min(len, slatCoverage);
        // an integer index of the furthest whole slat
        // from 0 to number slats (*exclusive*, so len-1)
        slatIndex = Math.floor(slatCoverage);
        slatIndex = Math.min(slatIndex, len - 1);
        // how much further through the slatIndex slat (from 0.0-1.0) must be covered in addition.
        // could be 1.0 if slatCoverage is covering *all* the slots
        slatRemainder = slatCoverage - slatIndex;
        return this.slatPositions.tops[slatIndex] +
            this.slatPositions.getHeight(slatIndex) * slatRemainder;