diff --git a/website/src/lib/locales.mjs b/website/src/lib/locales.mjs
index 05684d8d4..14cef3c06 100644
--- a/website/src/lib/locales.mjs
+++ b/website/src/lib/locales.mjs
@@ -1,40 +1,47 @@
-/**
- * Shared i18n locale configuration.
- *
- * Single source of truth for locale definitions used by:
- *   - website/astro.config.mjs  (Starlight i18n)
- *   - tools/build-docs.mjs      (llms-full.txt locale exclusion)
- *   - website/src/pages/404.astro (client-side locale redirect)
- *
- * The root locale (English) uses Starlight's 'root' key convention
- * (no URL prefix). All other locales get a URL prefix matching their key.
- */
-
-export const locales = {
-  root: {
-    label: 'English',
-    lang: 'en',
-  },
-  'vi-vn': {
-    label: 'Tiếng Việt',
-    lang: 'vi-VN',
-  },
-  'zh-cn': {
-    label: '简体中文',
-    lang: 'zh-CN',
-  },
-  fr: {
-    label: 'Français',
-    lang: 'fr-FR',
-  },
-  cs: {
-    label: 'Čeština',
-    lang: 'cs-CZ',
-  },
-};
-
-/**
- * Non-root locale keys (the URL prefixes for translated content).
- * @type {string[]}
- */
-export const translatedLocales = Object.keys(locales).filter((k) => k !== 'root');
+/**
+ * Shared i18n locale configuration.
+ *
+ * Single source of truth for locale definitions used by:
+ *   - website/astro.config.mjs  (Starlight i18n)
+ *   - tools/build-docs.mjs      (llms-full.txt locale exclusion)
+ *   - website/src/pages/404.astro (client-side locale redirect)
+ *
+ * The root locale (English) uses Starlight's 'root' key convention
+ * (no URL prefix). All other locales get a URL prefix matching their key.
+ */
+
+/**
+ * @typedef {Object} Locale
+ * @property {string} label - The display name of the locale.
+ * @property {string} lang - The BCP 47 language tag.
+ */
+
+/** @type {Record<string, Locale>} */
+export const locales = {
+  root: {
+    label: 'English',
+    lang: 'en',
+  },
+  'vi-vn': {
+    label: 'Tiếng Việt',
+    lang: 'vi-VN',
+  },
+  'zh-cn': {
+    label: '简体中文',
+    lang: 'zh-CN',
+  },
+  fr: {
+    label: 'Français',
+    lang: 'fr-FR',
+  },
+  cs: {
+    label: 'Čeština',
+    lang: 'cs-CZ',
+  },
+};
+
+/**
+ * Non-root locale keys (the URL prefixes for translated content).
+ * @type {string[]}
+ */
+export const translatedLocales = Object.keys(locales).filter((k) => k !== 'root');