Set up shared package for components and utilities.

packages/site_shared/analysis_options.yaml

@@ -0,0 +1,4 @@
+include: package:analysis_defaults/analysis.yaml
+
+formatter:
+  trailing_commas: preserve

site/lib/_sass/components/_button.scss → packages/site_shared/lib/_sass/_button.scss

@@ -1,4 +1,4 @@
-@use '../base/mixins';
+@use 'base/mixins';
 
 a {
   color: var(--site-link-fgColor);

site/lib/_sass/components/_card.scss → packages/site_shared/lib/_sass/_card.scss

@@ -1,4 +1,4 @@
-@use '../base/mixins';
+@use 'base/mixins';
 
 .card-list {
   display: flex;

site/lib/_sass/components/_dropdown.scss → packages/site_shared/lib/_sass/_dropdown.scss

@@ -1,4 +1,4 @@
-@use '../base/mixins';
+@use 'base/mixins';
 
 .dropdown {
   .dropdown-content {

packages/site_shared/lib/_sass/_menu-toggle.scss

@@ -0,0 +1,26 @@
+// Toggle between menu and close buttons if sidenav is open or not.
+body:not(.sidenav-closed) #menu-toggle {
+  @media (min-width: 1024px) {
+    display: none;
+  }
+}
+
+#menu-toggle span.material-symbols {
+  &:first-child {
+    display: inline;
+  }
+
+  &:last-child {
+    display: none;
+  }
+}
+
+body.open_menu #menu-toggle span.material-symbols {
+  &:first-child {
+    display: none;
+  }
+
+  &:last-child {
+    display: inline;
+  }
+}

site/lib/_sass/components/_site-switcher.scss → packages/site_shared/lib/_sass/_site-switcher.scss

@@ -1,5 +1,3 @@
-@use '../base/mixins';
-
 #site-switcher {
   position: relative;
 
@@ -64,4 +62,4 @@
       letter-spacing: normal;
     }
   }
-}
+}

site/lib/_sass/components/_tabs.scss → packages/site_shared/lib/_sass/_tabs.scss

@@ -1,4 +1,4 @@
-@use '../base/mixins';
+@use 'base/mixins';
 
 .tab-pane {
   display: none;

packages/site_shared/lib/analytics.dart

@@ -0,0 +1,21 @@
+// Copyright 2025 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:meta/meta.dart';
+
+import 'src/analytics/analytics_server.dart'
+    if (dart.library.js_interop) 'src/analytics/analytics_web.dart';
+
+/// Used to report analytic events.
+final analytics = AnalyticsImplementation();
+
+/// Contains methods for reporting analytics events.
+abstract class Analytics {
+  @protected
+  void sendEvent(String eventName, Map<String, Object?> parameters);
+
+  void sendFeedback(bool helpful) {
+    sendEvent('feedback', {'feedback_type': helpful ? 'up' : 'down'});
+  }
+}

site/lib/src/components/common/breadcrumbs.dart → packages/site_shared/lib/common/breadcrumbs.dart

@@ -7,7 +7,7 @@ import 'package:jaspr/dom.dart';
 import 'package:jaspr/jaspr.dart';
 import 'package:jaspr_content/jaspr_content.dart';
 
-import '../../util.dart';
+import '../util.dart';
 import 'material_icon.dart';
 
 /// Breadcrumbs navigation component that
@@ -18,11 +18,14 @@ import 'material_icon.dart';
 /// - https://schema.org/BreadcrumbList
 /// - https://www.w3.org/TR/wai-aria-practices/examples/breadcrumb/index.html
 class PageBreadcrumbs extends StatelessComponent {
-  const PageBreadcrumbs({super.key});
+  const PageBreadcrumbs({this.crumbs, super.key});
+
+  final List<BreadcrumbItem>? crumbs;
 
   @override
   Component build(BuildContext context) {
-    final crumbs = _breadcrumbsForPage(context.pages, context.page);
+    final crumbs =
+        this.crumbs ?? _breadcrumbsForPage(context.pages, context.page);
     if (crumbs == null || crumbs.isEmpty) {
       return const Component.empty();
     }
@@ -54,7 +57,7 @@ class PageBreadcrumbs extends StatelessComponent {
   ///
   /// Uses page metadata to generate breadcrumb titles with fallbacks:
   /// `breadcrumb` > `shortTitle` > `title`.
-  List<_BreadcrumbItem>? _breadcrumbsForPage(List<Page> pages, Page page) {
+  List<BreadcrumbItem>? _breadcrumbsForPage(List<Page> pages, Page page) {
     final pageUrl = page.url;
 
     // Only show breadcrumbs if the URL isn't empty.
@@ -71,7 +74,7 @@ class PageBreadcrumbs extends StatelessComponent {
         .toList(growable: false);
     if (segments.isEmpty) return null;
 
-    final breadcrumbs = <_BreadcrumbItem>[];
+    final breadcrumbs = <BreadcrumbItem>[];
     var currentPath = '';
 
     // Build breadcrumbs for each segment except the current page.
@@ -88,7 +91,7 @@ class PageBreadcrumbs extends StatelessComponent {
 
       if (indexPage.breadcrumb case final indexBreadcrumb?) {
         breadcrumbs.add(
-          _BreadcrumbItem(
+          BreadcrumbItem(
             title: indexBreadcrumb,
             url: indexPage.url,
           ),
@@ -104,7 +107,7 @@ class PageBreadcrumbs extends StatelessComponent {
 
     // Add the current page as the final breadcrumb.
     breadcrumbs.add(
-      _BreadcrumbItem(
+      BreadcrumbItem(
         title: pageBreadcrumb,
         url: pageUrl,
       ),
@@ -127,8 +130,8 @@ extension on Page {
   }
 }
 
-final class _BreadcrumbItem {
-  const _BreadcrumbItem({required this.title, required this.url});
+final class BreadcrumbItem {
+  const BreadcrumbItem({required this.title, required this.url});
 
   final String title;
   final String url;
@@ -142,7 +145,7 @@ final class _BreadcrumbItemComponent extends StatelessComponent {
     required this.isLast,
   });
 
-  final _BreadcrumbItem crumb;
+  final BreadcrumbItem crumb;
   final int index;
   final bool isLast;
 

site/lib/src/components/common/button.dart → packages/site_shared/lib/common/button.dart

@@ -5,7 +5,7 @@
 import 'package:jaspr/dom.dart';
 import 'package:jaspr/jaspr.dart';
 
-import '../../util.dart';
+import '../util.dart';
 import 'material_icon.dart';
 
 /// A generic button component with different style variants.
@@ -14,6 +14,7 @@ class Button extends StatelessComponent {
   const Button({
     super.key,
     this.icon,
+    this.trailingIcon,
     this.href,
     this.content,
     this.style = ButtonStyle.text,
@@ -30,6 +31,7 @@ class Button extends StatelessComponent {
   final String? title;
   final ButtonStyle style;
   final String? icon;
+  final String? trailingIcon;
   final String? id;
   final String? href;
   final Map<String, String> attributes;
@@ -48,14 +50,16 @@ class Button extends StatelessComponent {
 
     final mergedClasses = [
       style.cssClass,
-      if (icon != null && content == null) 'icon-button',
+      if ((icon != null || trailingIcon != null) && content == null)
+        'icon-button',
       ...?classes,
     ].toClasses;
 
     final children = <Component>[
       if (icon case final iconId?) MaterialIcon(iconId),
       if (content case final contentText?)
         asRaw ? RawText(contentText) : .text(contentText),
+      if (trailingIcon case final iconId?) MaterialIcon(iconId),
     ];
 
     if (href case final href?) {
@@ -90,17 +94,3 @@ enum ButtonStyle {
     ButtonStyle.text => 'text-button',
   };
 }
-
-class SegmentedButton extends StatelessComponent {
-  const SegmentedButton({
-    super.key,
-    required this.children,
-  });
-
-  final List<Component> children;
-
-  @override
-  Component build(BuildContext context) {
-    return span(classes: ['segmented-button'].toClasses, children);
-  }
-}

site/lib/src/components/common/card.dart → packages/site_shared/lib/common/card.dart

@@ -5,7 +5,7 @@
 import 'package:jaspr/dom.dart';
 import 'package:jaspr/jaspr.dart';
 
-import '../../util.dart';
+import '../util.dart';
 
 class Card extends StatelessComponent {
   /// Creates a card that can have a [header], [content], and [actions].

site/lib/src/components/common/chip.dart → packages/site_shared/lib/common/chip.dart

@@ -6,8 +6,8 @@ import 'package:jaspr/dom.dart';
 import 'package:jaspr/jaspr.dart';
 import 'package:universal_web/web.dart' as web;
 
-import '../../util.dart';
-import '../util/global_event_listener.dart';
+import '../util.dart';
+import '../utils/global_event_listener.dart';
 import 'material_icon.dart';
 
 /// A set of Material Design-like chips for configuration.

site/lib/src/components/common/client/cookie_notice.dart → packages/site_shared/lib/common/client/cookie_notice.dart

@@ -6,13 +6,20 @@ import 'package:jaspr/dom.dart';
 import 'package:jaspr/jaspr.dart';
 import 'package:universal_web/web.dart' as web;
 
-import '../../../util.dart';
+import '../../util.dart';
 import '../button.dart';
 
 /// The cookie banner to show on a user's first time visiting the site.
 @client
 final class CookieNotice extends StatefulComponent {
-  const CookieNotice({super.key});
+  const CookieNotice({
+    super.key,
+    required this.host,
+    this.alwaysDarkMode = false,
+  });
+
+  final String host;
+  final bool alwaysDarkMode;
 
   @override
   State<CookieNotice> createState() => _CookieNoticeState();
@@ -60,13 +67,16 @@ final class _CookieNoticeState extends State<CookieNotice> {
   Component build(BuildContext context) {
     return section(
       id: 'cookie-notice',
-      classes: [if (showNotice) 'show'].toClasses,
+      classes: [
+        if (showNotice) 'show',
+        if (component.alwaysDarkMode) 'always-dark-mode',
+      ].toClasses,
       attributes: {'data-nosnippet': 'true'},
       [
         div(classes: 'container', [
-          const p([
+          p([
             .text(
-              'docs.flutter.dev uses cookies from Google to deliver and '
+              '${component.host} uses cookies from Google to deliver and '
               'enhance the quality of its services and to analyze traffic.',
             ),
           ]),

site/lib/src/components/common/client/copy_button.dart → packages/site_shared/lib/common/client/copy_button.dart

@@ -11,11 +11,13 @@ import '../button.dart';
 class CopyButton extends StatefulComponent {
   const CopyButton({
     this.buttonText,
+    this.toCopy,
     this.classes = const [],
     this.title,
   });
 
   final String? title;
+  final String? toCopy;
   final String? buttonText;
   final List<String> classes;
 
@@ -32,38 +34,42 @@ class _CopyButtonState extends State<CopyButton> {
   @override
   void initState() {
     if (kIsWeb) {
-      // Extract the code content and unhide the copy button on the client.
-      context.binding.addPostFrameCallback(() {
-        setState(() {
-          final codeElement = buttonKey.currentNode
-              ?.closest('.code-block-wrapper')
-              ?.querySelector('pre code')
-              ?.cloneNode(true);
-          if (codeElement == null) return;
-
-          // Filter out hidden elements like the terminal sign or folding icons.
-          final iterator = web.document.createNodeIterator(
-            codeElement,
-            /* NodeFilter.SHOW_ELEMENT */ 1,
-          );
-          web.Node? currentNode;
-          while ((currentNode = iterator.nextNode()) != null) {
-            final element = currentNode as web.Element;
-            if (element.getAttribute('aria-hidden') == 'true') {
-              element.remove();
+      if (component.toCopy != null) {
+        content = component.toCopy;
+      } else {
+        // Extract the code content and unhide the copy button on the client.
+        context.binding.addPostFrameCallback(() {
+          setState(() {
+            final codeElement = buttonKey.currentNode
+                ?.closest('.code-block-wrapper')
+                ?.querySelector('pre code')
+                ?.cloneNode(true);
+            if (codeElement == null) return;
+
+            // Filter out hidden elements like the terminal sign or folding icons.
+            final iterator = web.document.createNodeIterator(
+              codeElement,
+              /* NodeFilter.SHOW_ELEMENT */ 1,
+            );
+            web.Node? currentNode;
+            while ((currentNode = iterator.nextNode()) != null) {
+              final element = currentNode as web.Element;
+              if (element.getAttribute('aria-hidden') == 'true') {
+                element.remove();
+              }
             }
-          }
 
-          // Remove zero-width spaces
-          content = codeElement.textContent?.replaceAll('\u200B', '');
-        });
+            // Remove zero-width spaces
+            content = codeElement.textContent?.replaceAll('\u200B', '');
+          });
 
-        assert(
-          content != null,
-          'CopyButton: Unable to find code content to copy. '
-          'Is the CopyButton inside a code block?',
-        );
-      });
+          assert(
+            content != null,
+            'CopyButton: Unable to find code content to copy. '
+            'Is the CopyButton inside a code block?',
+          );
+        });
+      }
     }
 
     super.initState();