feat: create announcements banner

src/generators/web/index.mjs

@@ -34,6 +34,7 @@ export default createLazyGenerator({
     useAbsoluteURLs: false,
     editURL: `${GITHUB_EDIT_URL}/doc/api{path}.md`,
     pageURL: '{baseURL}/latest-{version}/api{path}.html',
+    remoteConfig: 'https://nodejs.org/site.json',
     imports: {
       '#theme/Logo': '@node-core/ui-components/Common/NodejsLogo',
       '#theme/Navigation': join(import.meta.dirname, './ui/components/NavBar'),

src/generators/web/ui/components/AnnouncementBanner/AnnouncementBanner.jsx

@@ -0,0 +1,26 @@
+import { ArrowUpRightIcon } from '@heroicons/react/24/outline';
+import Banner from '@node-core/ui-components/Common/Banner';
+
+import styles from './index.module.css';
+
+/**
+ * @param {import('./types.d.ts').AnnouncementBannerProps} props
+ */
+const AnnouncementBanner = ({ banners }) => (
+  <div role="region" aria-label="Announcements" className={styles.banners}>
+    {banners.map(banner => (
+      <Banner key={banner.text} type={banner.type}>
+        {banner.link ? (
+          <a href={banner.link} target="_blank" rel="noopener noreferrer">
+            {banner.text}
+          </a>
+        ) : (
+          banner.text
+        )}
+        {banner.link && <ArrowUpRightIcon />}
+      </Banner>
+    ))}
+  </div>
+);
+
+export default AnnouncementBanner;

src/generators/web/ui/components/AnnouncementBanner/__tests__/loadBanners.test.mjs

@@ -0,0 +1,174 @@
+import assert from 'node:assert/strict';
+import { describe, it } from 'node:test';
+
+import { loadBanners } from '../loadBanners.mjs';
+
+const PAST = new Date(Date.now() - 86_400_000).toISOString(); // yesterday
+const FUTURE = new Date(Date.now() + 86_400_000).toISOString(); // tomorrow
+
+const makeResponse = (banners, ok = true) => ({
+  ok,
+  json: async () => ({ websiteBanners: banners }),
+});
+
+describe('loadBanners', () => {
+  describe('fetch behavior', () => {
+    it('fetches from the given URL', async t => {
+      t.mock.method(global, 'fetch', () => Promise.resolve(makeResponse({})));
+
+      await loadBanners('https://example.com/site.json', null);
+
+      assert.equal(global.fetch.mock.calls.length, 1);
+      assert.equal(
+        global.fetch.mock.calls[0].arguments[0],
+        'https://example.com/site.json'
+      );
+    });
+
+    it('returns an empty array on non-ok response', async t => {
+      t.mock.method(global, 'fetch', () =>
+        Promise.resolve(makeResponse({}, false))
+      );
+
+      const result = await loadBanners('https://example.com/site.json', null);
+
+      assert.deepEqual(result, []);
+    });
+
+    it('handles fetch errors silently', async t => {
+      t.mock.method(global, 'fetch', () =>
+        Promise.reject(new Error('Network error'))
+      );
+
+      const result = await loadBanners('https://example.com/site.json', null);
+
+      assert.deepEqual(result, []);
+    });
+
+    it('returns an empty array when remoteConfig is absent', async t => {
+      t.mock.method(global, 'fetch', () => Promise.resolve(makeResponse({})));
+
+      const result = await loadBanners(undefined, null);
+
+      assert.deepEqual(result, []);
+      assert.equal(global.fetch.mock.calls.length, 0);
+    });
+  });
+
+  describe('banner selection', () => {
+    it('returns the active global (index) banner', async t => {
+      const banner = { text: 'Global banner', type: 'warning' };
+      t.mock.method(global, 'fetch', () =>
+        Promise.resolve(makeResponse({ index: banner }))
+      );
+
+      const result = await loadBanners('https://example.com/site.json', null);
+
+      assert.deepEqual(result, [banner]);
+    });
+
+    it('returns the active version-specific banner', async t => {
+      const banner = { text: 'v20 banner', type: 'warning' };
+      t.mock.method(global, 'fetch', () =>
+        Promise.resolve(makeResponse({ v20: banner }))
+      );
+
+      const result = await loadBanners('https://example.com/site.json', 20);
+
+      assert.deepEqual(result, [banner]);
+    });
+
+    it('returns both global and version banners when both are active', async t => {
+      const globalBanner = { text: 'Global banner', type: 'warning' };
+      const versionBanner = { text: 'v20 banner', type: 'error' };
+      t.mock.method(global, 'fetch', () =>
+        Promise.resolve(
+          makeResponse({ index: globalBanner, v20: versionBanner })
+        )
+      );
+
+      const result = await loadBanners('https://example.com/site.json', 20);
+
+      assert.deepEqual(result, [globalBanner, versionBanner]);
+    });
+
+    it('returns global banner first, version banner second', async t => {
+      const globalBanner = { text: 'Global', type: 'warning' };
+      const versionBanner = { text: 'v22', type: 'error' };
+      t.mock.method(global, 'fetch', () =>
+        Promise.resolve(
+          makeResponse({ index: globalBanner, v22: versionBanner })
+        )
+      );
+
+      const result = await loadBanners('https://example.com/site.json', 22);
+
+      assert.equal(result[0], globalBanner);
+      assert.equal(result[1], versionBanner);
+    });
+
+    it('does not include the version banner when versionMajor is null', async t => {
+      const globalBanner = { text: 'Global banner', type: 'warning' };
+      const versionBanner = { text: 'v20 banner', type: 'error' };
+      t.mock.method(global, 'fetch', () =>
+        Promise.resolve(
+          makeResponse({ index: globalBanner, v20: versionBanner })
+        )
+      );
+
+      const result = await loadBanners('https://example.com/site.json', null);
+
+      assert.deepEqual(result, [globalBanner]);
+    });
+
+    it('returns an empty array when websiteBanners is absent', async t => {
+      t.mock.method(global, 'fetch', () =>
+        Promise.resolve({ ok: true, json: async () => ({}) })
+      );
+
+      const result = await loadBanners('https://example.com/site.json', null);
+
+      assert.deepEqual(result, []);
+    });
+  });
+
+  describe('date filtering', () => {
+    it('excludes a banner whose endDate has passed', async t => {
+      const banner = { text: 'Expired', type: 'warning', endDate: PAST };
+      t.mock.method(global, 'fetch', () =>
+        Promise.resolve(makeResponse({ index: banner }))
+      );
+
+      const result = await loadBanners('https://example.com/site.json', null);
+
+      assert.deepEqual(result, []);
+    });
+
+    it('excludes a banner whose startDate is in the future', async t => {
+      const banner = { text: 'Upcoming', type: 'warning', startDate: FUTURE };
+      t.mock.method(global, 'fetch', () =>
+        Promise.resolve(makeResponse({ index: banner }))
+      );
+
+      const result = await loadBanners('https://example.com/site.json', null);
+
+      assert.deepEqual(result, []);
+    });
+
+    it('includes a banner within its active date range', async t => {
+      const banner = {
+        text: 'Active',
+        type: 'warning',
+        startDate: PAST,
+        endDate: FUTURE,
+      };
+      t.mock.method(global, 'fetch', () =>
+        Promise.resolve(makeResponse({ index: banner }))
+      );
+
+      const result = await loadBanners('https://example.com/site.json', null);
+
+      assert.deepEqual(result, [banner]);
+    });
+  });
+});

src/generators/web/ui/components/AnnouncementBanner/index.jsx

@@ -0,0 +1,31 @@
+import { lazy, Suspense } from 'preact/compat';
+
+import AnnouncementBanner from './AnnouncementBanner.jsx';
+import { loadBanners } from './loadBanners.mjs';
+
+import { remoteConfig, versionMajor } from '#theme/config';
+
+// TODO: Revisit SERVER global usage.
+const LazyBanners = SERVER
+  ? null
+  : lazy(async () => {
+      const active = await loadBanners(remoteConfig, versionMajor);
+
+      if (!active.length) {
+        return { default: () => null };
+      }
+
+      return { default: () => <AnnouncementBanner banners={active} /> };
+    });
+
+const RemoteLoadableBanner = SERVER
+  ? () => <div />
+  : () => (
+      <div>
+        <Suspense fallback={null}>
+          <LazyBanners />
+        </Suspense>
+      </div>
+    );
+
+export default RemoteLoadableBanner;

src/generators/web/ui/components/AnnouncementBanner/index.module.css

@@ -0,0 +1,14 @@
+.banners {
+  animation: slideDown 300ms ease-out 400ms backwards;
+}
+
+@keyframes slideDown {
+  from {
+    opacity: 0;
+    transform: translateY(-0.5rem);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}

src/generators/web/ui/components/AnnouncementBanner/loadBanners.mjs

@@ -0,0 +1,33 @@
+import { isBannerActive } from '../../utils/banner.mjs';
+
+/**
+ * Fetches and returns active banners for the given version.
+ * Returns an empty array when remoteConfig is absent, the response is not ok,
+ * or on any fetch/parse failure.
+ *
+ * @param {string | undefined} remoteConfig
+ * @param {number | null} versionMajor
+ * @returns {Promise<Array<import('./types.d.ts').BannerEntry>>}
+ */
+export const loadBanners = async (remoteConfig, versionMajor) => {
+  if (!remoteConfig) {
+    return [];
+  }
+
+  try {
+    const res = await fetch(remoteConfig);
+
+    /** @type {import('./types.d.ts').RemoteConfig} */
+    const { websiteBanners = {} } = await res.json();
+
+    const keys = ['index', versionMajor != null && `v${versionMajor}`].filter(
+      Boolean
+    );
+
+    return keys
+      .map(key => websiteBanners[key])
+      .filter(banner => banner && isBannerActive(banner));
+  } catch {
+    return [];
+  }
+};

src/generators/web/ui/components/AnnouncementBanner/types.d.ts

@@ -0,0 +1,22 @@
+import type { BannerProps } from '@node-core/ui-components/Common/Banner';
+
+export type BannerEntry = {
+  startDate?: string;
+  endDate?: string;
+  text: string;
+  link?: string;
+  type?: BannerProps['type'];
+};
+
+export type RemoteConfig = {
+  websiteBanners?: Record<string, BannerEntry | undefined>;
+};
+
+export type AnnouncementBannerProps = {
+  banners: BannerEntry[];
+};
+
+export type RemoteLoadableBannerProps = {
+  remoteConfig: string;
+  versionMajor: number | null;
+};

src/generators/web/ui/components/Layout/index.jsx

@@ -1,6 +1,8 @@
 import TableOfContents from '@node-core/ui-components/Common/TableOfContents';
 import Article from '@node-core/ui-components/Containers/Article';
 
+import RemoteLoadableBanner from '../AnnouncementBanner';
+
 import Footer from '#theme/Footer';
 import MetaBar from '#theme/Metabar';
 import NavBar from '#theme/Navigation';
@@ -17,6 +19,7 @@ import SideBar from '#theme/Sidebar';
  */
 export default ({ metadata, headings, readingTime, children }) => (
   <>
+    <RemoteLoadableBanner />
     <NavBar metadata={metadata} />
     <Article>
       <SideBar metadata={metadata} />

src/generators/web/ui/types.d.ts

@@ -24,6 +24,7 @@ declare module '#theme/config' {
 
   // From config generation
   export const version: string;
+  export const versionMajor: number;
   export const versions: Array<{
     url: string;
     label: string;
@@ -32,6 +33,7 @@ declare module '#theme/config' {
   export const editURL: string;
   export const pages: Array<[string, string]>;
   export const languageDisplayNameMap: Map<string[], string>;
+  export const remoteConfig: string;
 }
 
 // Omit Primitives from Metadata