Fill layer

C# type: FillLayer — requires source (and source-layer for vector tiles).

Key paint properties: FillColor, FillOpacity, FillOutlineColor, FillPattern, FillLayerOpacity, FillEmissiveStrength.

Layout: FillSortKey, Visibility.

await map.AddLayer(new FillLayer
{
    Id = "regions",
    Source = "geojson",
    Paint = new FillLayerPaint { FillColor = "#4e8752", FillOpacity = 0.8 },
});

See Load GeoJSON example.