Watermark: (
    ctx: BGContext,
    style: ObjectStyle,
    plotArea: Bounds,
    plotAreaInsets: EdgeInsets,
    chartButtonsRatio: number,
) => void

Watermark function implementations need to be registered with the BG.charts.utils.addWatermark function, and can then be set active by calling BG.charts.utils.set('activeWatermark', $name);

Type declaration