docs: Added package manager tab group synchronization across the entire installation page

docs/.vitepress/theme/index.ts

@@ -7,6 +7,7 @@ import BlogLayout from '../components/BlogLayout.vue';
 import './custom.css';
 import 'virtual:group-icons.css';
 import type { EnhanceAppContext } from 'vitepress/client';
+import { setupCodeGroupSync } from '../utils/code-groups';
 
 export default {
   extends: DefaultTheme,
@@ -17,5 +18,7 @@ export default {
       .component('UsingWxtSection', UsingWxtSection)
       .component('ExampleSearch', ExampleSearch)
       .component('blog', BlogLayout);
+
+    setupCodeGroupSync();
   },
 };

docs/.vitepress/utils/code-groups-sync.ts

@@ -0,0 +1,73 @@
+const CODE_GROUP_SELECTORS = {
+  root: '.vp-code-group',
+  input: '.vp-code-group .tabs input',
+  label: '.tabs label',
+} as const;
+
+function getTabTitle(label: HTMLLabelElement) {
+  return label.dataset.title?.trim() || label.textContent?.trim();
+}
+
+function getCodeGroupTitle(input: HTMLInputElement) {
+  const label = input.parentElement?.querySelector<HTMLLabelElement>(
+    `label[for="${input.id}"]`,
+  );
+
+  return label ? getTabTitle(label) : undefined;
+}
+
+function findCodeGroupTabIndex(group: HTMLElement, title: string) {
+  return Array.from(
+    group.querySelectorAll<HTMLLabelElement>(CODE_GROUP_SELECTORS.label),
+  ).findIndex((label) => getTabTitle(label) === title);
+}
+
+function syncCodeGroupSelection(group: HTMLElement, title: string) {
+  const targetIndex = findCodeGroupTabIndex(group, title);
+
+  if (targetIndex < 0) return;
+
+  const blocks = group.querySelector('.blocks');
+  const targetBlock = blocks?.children[targetIndex];
+  if (!blocks || !targetBlock || targetBlock.classList.contains('active'))
+    return;
+
+  blocks.querySelector('.active')?.classList.remove('active');
+  targetBlock.classList.add('active');
+
+  const input = group.querySelectorAll<HTMLInputElement>(
+    CODE_GROUP_SELECTORS.input,
+  )[targetIndex];
+  if (input) input.checked = true;
+}
+
+function syncCodeGroupTabs(event: Event) {
+  const target = event.target;
+  if (
+    !(target instanceof HTMLInputElement) ||
+    !target.matches(CODE_GROUP_SELECTORS.input)
+  )
+    return;
+
+  const activeGroup = target.closest(CODE_GROUP_SELECTORS.root);
+  const activeTitle = getCodeGroupTitle(target);
+  if (!activeTitle) return;
+
+  document
+    .querySelectorAll<HTMLElement>(CODE_GROUP_SELECTORS.root)
+    .forEach((group) => {
+      if (group === activeGroup) return;
+
+      syncCodeGroupSelection(group, activeTitle);
+    });
+}
+
+/**
+ * Keeps every code group on the page in sync: selecting a package manager (or
+ * any tab) in one group switches the matching tab in all the other groups.
+ */
+export function setupCodeGroupSync() {
+  if (typeof window === 'undefined') return;
+
+  window.addEventListener('change', syncCodeGroupTabs, true);
+}