Flip site to v3 as the latest Lit version

packages/lit-dev-content/samples/base.json

@@ -1,3 +1,3 @@
 {
-  "extends": "/samples/v2-base.json"
+  "extends": "/samples/v3-base.json"
 }

packages/lit-dev-content/site/_includes/default.html

@@ -67,17 +67,12 @@
 
     {% include 'header.html' %}
 
-    {% if selectedVersion !== latestVersion and selectedVersion !== "v3"  %}
+    {% if selectedVersion !== latestVersion %}
       <litdev-banner>
         You're viewing docs for an older version of Lit. Click
         <a href="{{ versions[latestVersion].path }}/{{ versionLinks[latestVersion] }}">
         here</a> for the latest version.
       </litdev-banner>
-    {% elif selectedVersion === "v3" %}
-      <litdev-banner>
-        You're viewing docs for a pre-release version of Lit. Read the Lit 3.0 pre-releases
-        announcement <a href="/blog/2023-09-27-lit-3.0-prerelease-2/">here</a>.
-      </litdev-banner>
     {% endif %}
 
     <main {% if not page.url.includes('/docs/')

packages/lit-dev-content/site/docs/v2/v2.json

@@ -1,3 +1,4 @@
 {
-  "collection": "docs-v2"
+  "collection": "docs-v2",
+  "selectedVersion": "v2"
 }

packages/lit-dev-content/site/home/1-splash.html

@@ -1,5 +1,5 @@
 <section id="new-banner">
-  <p><span class="emoji">📣</span> Have a question, or looking to chat? Join our <a href="{{site.baseurl}}/discord/">Discord server!</a></p>
+  <p><span class="emoji">📣</span> Lit 3 just landed! Check out the <a href="/blog/2023-10-10-lit-3.0/">Lit 3 release announcement!</a></p>
 </section>
 <section id="intro">
   <div id="splashLogo" role="heading" aria-level="1">

packages/lit-dev-content/site/site.json

@@ -1,13 +1,13 @@
 {
-  "selectedVersion": "v2",
-  "latestVersion": "v2",
+  "selectedVersion": "v3",
+  "latestVersion": "v3",
   "versions": {
     "v3": {
-      "path": "/docs/v3",
+      "path": "/docs",
       "label": "v3"
     },
     "v2": {
-      "path": "/docs",
+      "path": "/docs/v2",
       "label": "v2"
     },
     "v1": {

packages/lit-dev-server/src/redirects.ts

@@ -12,26 +12,29 @@ export const pageRedirects = new Map([
   ['/msg/dev-mode',                   '/docs/tools/development/#development-and-production-builds'],
   // TODO(sorvell) https://github.com/lit/lit.dev/issues/455
   ['/msg/multiple-versions',          '/docs/tools/requirements/'],
-  ['/msg/polyfill-support-missing',   '/docs/tools/requirements/#polyfills'],
+  ['/msg/polyfill-support-missing',   '/docs/v2/tools/requirements/#polyfills'],
   ['/msg/class-field-shadowing',      '/docs/components/properties/#avoiding-issues-with-class-fields'],
   // TODO(aomarks) Should we add something specifically about this issue?
   ['/msg/change-in-update',           '/docs/components/properties/#when-properties-change'],
-  ['/msg/deprecated-import-path',     '/docs/releases/upgrade/#update-packages-and-import-paths'],
-  ['/msg/removed-api',                '/docs/releases/upgrade/#litelement'],
-  ['/msg/renamed-api',                '/docs/releases/upgrade/#update-to-renamed-apis'],
-  ['/msg/undefined-attribute-value',  '/docs/releases/upgrade/#litelement'],
-  ['/msg/request-update-promise',     '/docs/releases/upgrade/#litelement'],
+  ['/msg/deprecated-import-path',     '/docs/v2/releases/upgrade/#update-packages-and-import-paths'],
+  ['/msg/removed-api',                '/docs/v2/releases/upgrade/#litelement'],
+  ['/msg/renamed-api',                '/docs/v2/releases/upgrade/#update-to-renamed-apis'],
+  ['/msg/undefined-attribute-value',  '/docs/v2/releases/upgrade/#litelement'],
+  ['/msg/request-update-promise',     '/docs/v2/releases/upgrade/#litelement'],
   ['/msg/expression-in-template',     '/docs/templates/expressions/#invalid-locations'],
   ['/msg/expression-in-textarea',     '/docs/templates/expressions/#invalid-locations'],
   // Relocated pages
   ['/docs/libraries/localization',    '/docs/localization/overview/'],
   ['/blog/feed.xml',                  '/blog/atom.xml'],
   // Urls not ending with '/' violate CSP policies.
-  ['/docs/releases/release-notes/1.3.0.html', '/docs/releases/release-notes/1.3.0/'],
-  ['/docs/releases/release-notes/1.2.0.html', '/docs/releases/release-notes/1.2.0/'],
+  ['/docs/releases/release-notes/1.3.0.html', '/docs/v2/releases/release-notes/1.3.0/'],
+  ['/docs/releases/release-notes/1.2.0.html', '/docs/v2/releases/release-notes/1.2.0/'],
   // `.0` is treated as a file extension, ensure it resolves correctly.
-  ['/docs/releases/release-notes/1.3.0',      '/docs/releases/release-notes/1.3.0/'],
-  ['/docs/releases/release-notes/1.2.0',      '/docs/releases/release-notes/1.2.0/'],
+  ['/docs/releases/release-notes/1.3.0',      '/docs/v2/releases/release-notes/1.3.0/'],
+  ['/docs/releases/release-notes/1.2.0',      '/docs/v2/releases/release-notes/1.2.0/'],
+  // Old release-notes redirects to new v2 location.
+  ['/docs/releases/release-notes/1.3.0/',      '/docs/v2/releases/release-notes/1.3.0/'],
+  ['/docs/releases/release-notes/1.2.0/',      '/docs/v2/releases/release-notes/1.2.0/'],
   // Old Lit tutorial redirect to new tutorial catalog
   ['/tutorial/', '/tutorials/'],
 ].map(([path, redir]) => [

packages/lit-dev-tests/known-good-urls.txt

@@ -497,3 +497,20 @@ https://docs.astro.build/en/guides/integrations-guide/lit/
 https://rocket.modern-web.dev/
 https://stackblitz.com/edit/lit-ssr-global?file=src/server.js
 https://twitter.com/techytacos
+https://github.com/itsdouges/typescript-transformer-handbook#the-basics
+https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function
+https://developer.mozilla.org/en-US/docs/Glossary/Primitive
+https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing_operator
+https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes/extends#mix-ins
+https://github.com/webcomponents-cg/community-protocols/blob/main/proposals/context.md
+https://www.w3.org/community/webcomponents/
+https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API
+https://developer.mozilla.org/en-US/docs/Web/API/AbortController
+https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal
+https://developer.mozilla.org/en-US/docs/Web/API/fetch
+https://developer.mozilla.org/en-US/docs/Web/CSS/display#box
+https://github.com/google/safe-html-types/blob/master/doc/safehtml-types.md
+https://devblogs.microsoft.com/typescript/announcing-typescript-5-2/#decorator-metadata
+https://preactjs.com/guide/v10/signals/
+https://www.youtube.com/watch?v=l6Gn5uV83sw
+https://github.com/e111077

packages/lit-dev-tests/src/playwright/components-styles.spec.ts

@@ -19,15 +19,15 @@ test.describe('docs/components/styles', () => {
 
     // Wait for the exact playground preview we want to load.
     await page.waitForSelector(
-      'litdev-example[project="v2-docs/components/style/superstyles"] playground-preview [part="preview-loading-indicator"][aria-hidden="true"]'
+      'litdev-example[project="v3-docs/components/style/superstyles"] playground-preview [part="preview-loading-indicator"][aria-hidden="true"]'
     );
     // Wait for the loading bar to fade out.
     await page.waitForTimeout(250);
 
     await expect(
       await page
         .locator(
-          'litdev-example[project="v2-docs/components/style/superstyles"] playground-preview'
+          'litdev-example[project="v3-docs/components/style/superstyles"] playground-preview'
         )
         .screenshot()
     ).toMatchSnapshot('inheritingStylesPlaygroundPreview.png');

packages/lit-dev-tools-esm/src/build-unversioned-docs.ts

@@ -15,7 +15,7 @@ const CONTENT_PKG = pathlib.resolve(REPO_ROOT, 'packages', 'lit-dev-content');
 const SITE_JSON = pathlib.resolve(CONTENT_PKG, 'site', 'site.json');
 
 interface SiteJSON {
-  latestVersion: 'v1' | 'v2';
+  latestVersion: 'v1' | 'v2' | 'v3';
 }
 
 type EleventyFrontMatterData = string[];
@@ -44,7 +44,7 @@ const UNVERSIONED_VERSION_LOCATION = pathlib.resolve(
  *
  * The following transforms are then applied on the files:
  *   - Permalink frontmatter is added to strip the version from the URL. E.g.,
- *     /docs/v2/* becomes /docs/*.
+ *     /docs/v3/* becomes /docs/*.
  *  - `api.html` has frontmatter transformed so base api paths become
  *    unversioned.
  *  - The latest version `v[N].json` file is renamed `unversioned.json` so it