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

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5402#discussion_r1937282323">app/assets/javascripts/heatmap.js</a>:</p>
<pre style='color:#555'>> +          type: "threshold",
+          range: currentTheme === "dark" ? rangeColors : Array.from(rangeColors).reverse(),
+          domain: [10, 20, 30, 40]
+        }
+      }
+    }, [
+      [Tooltip, {
+        text: (date, value) => getTooltipText(date, value, locale)
+      }]
+    ]);
+  }
+});
+
+function getThemeFromColorScheme(colorScheme) {
+  if (colorScheme === "auto") {
+    return window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
</pre>
<p dir="auto">You already have <code class="notranslate">mediaQuery</code> defined. It can be used here:</p>
⬇️ Suggested change
<pre style="color: #555">-    return window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
+    return mediaQuery.matches ? "dark" : "light";
</pre>

<p dir="auto">For this to work, declarations have to be moved around. Maybe this function doesn't need to be declared. You already have <code class="notranslate">if (colorScheme === "auto") ...</code> above that is not inside a function.</p>

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