(async () => {

    const topology = await fetch(
        'https://code.highcharts.com/mapdata/custom/world.topo.json'
    ).then(response => response.json());

    Highcharts.getJSON('https://cdn.jsdelivr.net/gh/highcharts/[email protected]/samples/data/world-population-density.json', function (data) {

        // Prevent logarithmic errors in color calulcation
        data.forEach(function (p) {
            p.value = (p.value < 1 ? 1 : p.value);
        });

        // Initialize the chart
        Highcharts.mapChart('container', {
            chart: {
                map: topology
            },

            title: {
                text: 'Zoom in on country by double click'
            },

            mapNavigation: {
                enabled: true,
                enableDoubleClickZoomTo: true
            },

            colorAxis: {
                min: 1,
                max: 1000,
                type: 'logarithmic'
            },

            series: [{
                data: data,
                joinBy: ['iso-a3', 'code3'],
                name: 'Population density',
                states: {
                    hover: {
                        color: '#a4edba'
                    }
                },
                tooltip: {
                    valueSuffix: '/km²'
                }
            }]
        });
    });

})();