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

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5550#discussion_r1929773940">app/assets/javascripts/embed.js.erb</a>:</p>
<pre style='color:#555'>> -    new L.OSM.CycleMap(thunderforestOptions).addTo(map);
-  } else if (args.layer === "transportmap") {
-    new L.OSM.TransportMap(thunderforestOptions).addTo(map);
-  } else if (args.layer === "hot") {
-    new L.OSM.HOT().addTo(map);
-  } else {
-    new L.OSM.Mapnik(mapnikOptions).addTo(map);
-  }
+  var baseLayers = {
+    cyclosm: ["CyclOSM"],
+    cyclemap: ["CycleMap", thunderforestOptions],
+    transportmap: ["TransportMap", thunderforestOptions],
+    hot: ["HOT"],
+    mapnik: ["Mapnik", mapnikOptions]
+  };
+  baseLayers["cycle map"] = baseLayers.cyclemap;
</pre>
<p dir="auto"><code class="notranslate">const</code> defines only the variable. Ii does not prevent changing the properties of the object.<br>
But yes, changing all <code class="notranslate">var</code> into <code class="notranslate">let</code>/<code class="notranslate">const</code> would be good because they work with much less surprise.</p>

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