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

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5833#discussion_r2007242779">app/assets/javascripts/heatmap.js</a>:</p>
<pre style='color:#555'>> @@ -59,9 +60,10 @@ document.addEventListener("DOMContentLoaded", () => {
       },
       scale: {
         color: {
-          type: "threshold",
-          range: currentTheme === "dark" ? rangeColors : Array.from(rangeColors).reverse(),
-          domain: [10, 20, 30, 40]
+          type: "linear",
+          // reverse mutates the array. But with theme changes we must work on the original data.
+          range: currentTheme === "dark" ? rangeColors : Array.from(rangeColors).toReversed(),
</pre>
<p dir="auto">I experimented with <code class="notranslate">toReversed</code> (from es2023) and failed to revert as I found that eslint had es2021 as min version.</p>

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