<p></p>
<p><b>@HolgerJeromin</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5416#discussion_r1891553543">app/assets/javascripts/leaflet.share.js</a>:</p>
<pre style='color:#555'>> @@ -411,34 +416,20 @@ L.OSM.share = function (options) {
       $("#mapnik_image_width").text(mapWidth);
       $("#mapnik_image_height").text(mapHeight);
 
-      const layerId = map.getMapBaseLayerId();
-      const layerKeys = new Map([
-        ["mapnik", "standard"],
-        ["cyclemap", "cycle_map"],
-        ["transportmap", "transport_map"]
-      ]);
+      const canDownloadImage = layer && layer.options.canDownloadImage;
</pre>
⬇️ Suggested change
<pre style="color: #555">-      const canDownloadImage = layer && layer.options.canDownloadImage;
+      const canDownloadImage = !!(layer && layer.options.canDownloadImage);
</pre>

<p dir="auto">or</p>
⬇️ Suggested change
<pre style="color: #555">-      const canDownloadImage = layer && layer.options.canDownloadImage;
+      const canDownloadImage = Boolean(layer && layer.options.canDownloadImage);
</pre>

<p dir="auto"><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing" rel="nofollow">Modern js</a> would be (available across browsers since September 2020):</p>
⬇️ Suggested change
<pre style="color: #555">-      const canDownloadImage = layer && layer.options.canDownloadImage;
+      const canDownloadImage = layer?.options.canDownloadImage ?? false;
</pre>


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