Incorrect documentation for tileUrl with null value

[reilem]

The docs for tileUrl state:

(optional) Tile server URL for the map base layer or null for empty base layer. {x},{y},{z} or {quadkey} supported.

However this "or null" is no longer true since version 1.11.0.

This code:

import StaticMaps from 'staticmaps';

async function main() {
    const map = new StaticMaps({
        width: 600,
        height: 600,
        tileUrl: null,
        reverseY: true,
    });

    await map.render([0, 0], 2);

    await map.image.save("map.png");
}

main();

On version 1.10.0 and before used to render an empty image where every pixel had rgba value (0,0,0,0). This was useful for creating a blank image with annotations rendered which could then be overlayed on top of other maps. However, since version 1.11.0 this now creates this image:

Is it still possible to create empty layers? Or has this been removed? If this feature has been removed then maybe it would be nice to add this to the release notes as a breaking change and also to update the docs. Thanks!

[reilem]

For those interested I found a way to get transparent maps by using a fake url that does not point to anything, e.g. "https://fake-tiles.example.com/{z}/{x}/{y}.png" this returns 404s and will result in a transparent layer.