JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://code.highcharts.com/highcharts.src.js"></script>
<script src="http://code.highcharts.com/modules/exporting.js"></script>

<div id="container" style="min-width: 310px; height: 400px; margin: 0 auto"></div>

JavaScript

x = null;
$(function () {
        var a = new Highcharts.Chart({
          chart: {
            renderTo: 'container',
            type: 'line'
          },
            xAxis: {
                categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
                    'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
            },
            tooltip: {
                shared: true,
                enabled: true,
                formatter: function() { return 'aaaa'; }
            },
            
            plotOptions: {
                series: {
                    point: {
                    events: {
                        mouseOver: function(evt) {
                        a.options.tooltip.formatter = function() { return 'ggggg'; }
                        
                        var hoveredPoints = a.hoverPoints;
                            a.tooltip.refresh(hoveredPoints);
                        },
                        mouseOut: function() {
                            a.tooltip.hide();
                        }                       
                    }
                    }
                    
                    
                }
            },
            series: [{
                name: 'Tokyo',
                data: [7.0, 6.9, 9.5, 14.5, 18.2, 21.5, 25.2, 26.5, 23.3, 18.3, 13.9, 9.6]
            }, {
                name: 'LOBYO',
                data: [4.0, 1.9, 2.5, 1.5, 8.2, 15.5, 5.2, 16.5, 13.3, 1.3, 15.9, 7.6]
            }]
        });
    });