JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://api-maps.yandex.ru/2.1-dev/?lang=ru-RU&amp;mode=debug"></script>
<div id=map></div>

CSS

html, body, #map {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%
}

JavaScript

ymaps.ready(function () {
    var myMap = new ymaps.Map('map', {
            center: [55.751574, 37.573856],
        controls: [],
            zoom: 9
        }),
        clusterer = new ymaps.Clusterer({
            clusterHideIconOnBalloonOpen: false,
            geoObjectHideIconOnBalloonOpen: false,
            disableClickZoom: true
        });
    
    var activeObjectMonitor;
    
    clusterer.events
        .add('balloonopen', function (event) {
            debugger;
           activeObjectMonitor = new ymaps.Monitor(event.get('cluster').state);
           activeObjectMonitor.add('activeObject', function (newValue, oldValue) {
               debugger;
           });
        })
        .remove('balloonclose', function (event) {
            activeObjectMonitor.removeAll();
        });

    var getPointData = function (index) {
            return {
                balloonContentBody: 'балун <strong>метки ' + index + '</strong>',
                clusterCaption: 'метка <strong>' + index + '</strong>'
            };
        },
        points = [
            [55.831903,37.411961], [55.763338,37.565466], [55.763338,37.565466], [55.744522,37.616378], [55.780898,37.642889], [55.793559,37.435983], [55.800584,37.675638], [55.716733,37.589988], [55.775724,37.560840], [55.822144,37.433781], [55.874170,37.669838], [55.716770,37.482338], [55.780850,37.750210], [55.810906,37.654142], [55.865386,37.713329], [55.847121,37.525797], [55.778655,37.710743], [55.623415,37.717934], [55.863193,37.737000], [55.866770,37.760113], [55.698261,37.730838], [55.633800,37.564769], [55.639996,37.539400], [55.690230,37.405853], [55.775970,37.512900], [55.775777,37.442180], [55.811814,37.440448], [55.751841,37.404853], [55.627303,37.728976], [55.816515,37.597163], [55.664352,37.689397], [55.679195,37.600961], [55.673873,37.658425], [55.681006,37.605126], [55.876327,37.431744], [55.843363,37.778445], [55.875445,37.549348], [55.662903,37.702087], [55.746099,37.434113], [55.838660,37.712326],...