# Welcome to the Highcharts Maps JS (highmaps) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

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# series.geoheatmap

A `geoheatmap` series. If the type option is not specified, it is inherited from chart.type.

Configuration options for the series are given in three levels:

1. Options for all series in a chart are defined in the plotOptions.series object.
2. Options for all `geoheatmap` series are defined in plotOptions.geoheatmap.
3. Options for one single series are given in the series instance array.

    Highcharts.chart('container', {
        plotOptions: {
            series: {
                // general options for all series
            },
            geoheatmap: {
                // shared options for all geoheatmap series
            }
        },
        series: [{
            // specific options for this series instance
            type: 'geoheatmap'
        }]
    });

TypeScript:

- type option should always be set, otherwise a broad set of unsupported options is allowed.
- when accessing an array of series, the combined set of all series types is represented by Highcharts.SeriesOptionsType . Narrowing down to the specific type can be done by checking the `type` property.

    if (chart.options.series?.[0]?.type === geoheatmap) {
        // code specific to the geoheatmap series
    }