PluginsAPI.Map.addActionButton(function(options){
	if (options.tiles.length > 0){
		// TODO: pick the topmost layer instead
		// of the first on the list, to support
		// maps that display multiple tasks.

		var tile = options.tiles[0];
		var url = window.location.protocol + "//" + 
					window.location.host +
					tile.url.replace(/tiles\.json$/, "tiles/{zoom}/{x}/{ty}.png");

		return React.createElement("button", {
				type: "button",
				className: "btn btn-sm btn-secondary",
				onClick: function(){
					var mapLocation = options.map.getZoom() + "/" + 
									  options.map.getCenter().lat + "/" + 
									  options.map.getCenter().lng;
					window.location.href = "https://www.openstreetmap.org/edit?editor=id#map=" + mapLocation + 
											"&background=custom:" + url;
				}
			}, React.createElement("i", {className: "far fa-map"}, ""), 
				" OSM Digitize");
	}

});
PluginsAPI.Map.addActionButton(function(options){
	if (options.tiles.length > 0){
		// TODO: pick the topmost layer instead
		// of the first on the list, to support
		// maps that display multiple tasks.

		var tile = options.tiles[0];
		var url = window.location.protocol + "//" + 
					window.location.host +
					tile.url + "tiles/{zoom}/{x}/{y}.png";

		return React.createElement("button", {
				type: "button",
				className: "btn btn-sm btn-secondary",
				onClick: function(){
					var mapLocation = options.map.getZoom() + "/" + 
									  options.map.getCenter().lat + "/" + 
									  options.map.getCenter().lng;
					window.location.href = "https://www.openstreetmap.org/edit?editor=id#map=" + mapLocation + 
											"&background=custom:" + url;
				}
			}, React.createElement("i", {className: "far fa-map"}, ""), 
				" OSM Digitize");
	}

});
Adjust url from custom baselayer in OSM