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src/scripts/theme-init.js

@@ -0,0 +1,22 @@
+(function () {
+  var key = 'theme';
+  var legacyKey = 'dark-mode';
+  var saved = null;
+  try {
+    var value = localStorage.getItem(key);
+    if (value === 'light' || value === 'dark') {
+      saved = value;
+    } else {
+      var legacyValue = localStorage.getItem(legacyKey);
+      if (legacyValue !== null) {
+        saved = JSON.parse(legacyValue) ? 'dark' : 'light';
+      }
+    }
+  } catch (e) {
+    saved = null;
+  }
+  var systemDark = matchMedia('(prefers-color-scheme: dark)').matches;
+  var theme = saved || (systemDark ? 'dark' : 'light');
+  document.documentElement.dataset.theme = theme;
+  document.documentElement.style.colorScheme = theme;
+})();