chore: New demo server featuring SSR

dev-server/app.tsx

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+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+import React, { createContext, Suspense, useContext, useEffect, useState } from 'react';
+
+import ErrorBoundary from './error-boundary';
+import { defaultURLParams, formatURLParams, URLParams } from './url-params';
+
+/**
+ * App context for sharing URL parameters and page state
+ */
+export interface AppContextType {
+  pageId?: string;
+  urlParams: URLParams;
+  isServer: boolean;
+  setUrlParams: (newParams: Partial<URLParams>) => void;
+}
+
+const AppContext = createContext<AppContextType>({
+  pageId: undefined,
+  urlParams: defaultURLParams,
+  isServer: true,
+  setUrlParams: () => {},
+});
+
+export const useAppContext = () => useContext(AppContext);
+
+/**
+ * Props for the App shell component
+ */
+export interface AppProps {
+  pageId?: string;
+  urlParams: URLParams;
+  isServer: boolean;
+  children: React.ReactNode;
+}
+
+/**
+ * Check if a page is an AppLayout page (needs special handling)
+ */
+function isAppLayoutPage(pageId?: string): boolean {
+  if (!pageId) {
+    return false;
+  }
+  const appLayoutPages = [
+    'app-layout',
+    'content-layout',
+    'grid-navigation-custom',
+    'expandable-rows-test',
+    'container/sticky-permutations',
+    'copy-to-clipboard/scenario-split-panel',
+    'prompt-input/simple',
+    'funnel-analytics/static-single-page-flow',
+    'funnel-analytics/static-multi-page-flow',
+    'charts.test',
+    'error-boundary/demo-async-load',
+    'error-boundary/demo-components',
+  ];
+  return appLayoutPages.some(match => pageId.includes(match));
+}
+
+/**
+ * Theme switcher component with toggles for dark mode, density, motion, etc.
+ */
+function ThemeSwitcher({
+  urlParams,
+  setUrlParams,
+}: {
+  urlParams: URLParams;
+  setUrlParams: (p: Partial<URLParams>) => void;
+}) {
+  const switcherStyle: React.CSSProperties = {
+    display: 'flex',
+    gap: '12px',
+    alignItems: 'center',
+    fontSize: '12px',
+  };
+
+  const labelStyle: React.CSSProperties = {
+    display: 'flex',
+    alignItems: 'center',
+    gap: '4px',
+    cursor: 'pointer',
+  };
+
+  return (
+    <div style={switcherStyle}>
+      <label style={labelStyle}>
+        <input
+          id="visual-refresh-toggle"
+          type="checkbox"
+          checked={urlParams.visualRefresh}
+          onChange={e => {
+            const newVisualRefresh = e.target.checked;
+            const updatedParams = { ...urlParams, visualRefresh: newVisualRefresh };
+            // Update URL first, then reload
+            const currentPath = window.location.pathname;
+            const newUrl = `${currentPath}${formatURLParams(updatedParams)}`;
+            window.location.href = newUrl;
+          }}
+        />
+        Visual refresh
+      </label>
+      <label style={labelStyle}>
+        <input
+          id="mode-toggle"
+          type="checkbox"
+          checked={urlParams.mode === 'dark'}
+          onChange={e => setUrlParams({ mode: e.target.checked ? 'dark' : 'light' })}
+        />
+        Dark mode
+      </label>
+      <label style={labelStyle}>
+        <input
+          id="density-toggle"
+          type="checkbox"
+          checked={urlParams.density === 'compact'}
+          onChange={e => setUrlParams({ density: e.target.checked ? 'compact' : 'comfortable' })}
+        />
+        Compact mode
+      </label>
+      <label style={labelStyle}>
+        <input
+          id="disabled-motion-toggle"
+          type="checkbox"
+          checked={urlParams.motionDisabled}
+          onChange={e => setUrlParams({ motionDisabled: e.target.checked })}
+        />
+        Disable motion
+      </label>
+    </div>
+  );
+}
+
+/**
+ * Header component for the demo pages
+ */
+function Header({
+  sticky,
+  urlParams,
+  setUrlParams,
+}: {
+  sticky?: boolean;
+  urlParams: URLParams;
+  setUrlParams: (p: Partial<URLParams>) => void;
+}) {
+  const headerStyle: React.CSSProperties = {
+    boxSizing: 'border-box',
+    background: '#232f3e',
+    paddingBlockStart: '12px',
+    paddingBlockEnd: '11px',
+    paddingInline: '12px',
+    fontSize: '15px',
+    fontWeight: 700,
+    lineHeight: '17px',
+    display: 'flex',
+    color: '#eee',
+    justifyContent: 'space-between',
+    alignItems: 'center',
+    ...(sticky && {
+      inlineSize: '100%',
+      zIndex: 1000,
+      insetBlockStart: 0,
+      position: 'sticky' as const,
+    }),
+  };
+
+  const linkStyle: React.CSSProperties = {
+    textDecoration: 'none',
+    color: '#eee',
+  };
+
+  return (
+    <header id="h" style={headerStyle}>
+      <a href="/" style={linkStyle}>
+        Demo Assets
+      </a>
+      <ThemeSwitcher urlParams={urlParams} setUrlParams={setUrlParams} />
+    </header>
+  );
+}
+
+/**
+ * Client-side effects for applying global styles and modes
+ * These only run on the client after hydration
+ */
+function ClientEffects({ urlParams }: { urlParams: URLParams }) {
+  useEffect(() => {
+    // Apply mode (light/dark)
+    import('@cloudscape-design/global-styles').then(({ applyMode, Mode }) => {
+      applyMode(urlParams.mode === 'dark' ? Mode.Dark : Mode.Light);
+    });
+  }, [urlParams.mode]);
+
+  useEffect(() => {
+    // Apply density
+    import('@cloudscape-design/global-styles').then(({ applyDensity, Density }) => {
+      applyDensity(urlParams.density === 'compact' ? Density.Compact : Density.Comfortable);
+    });
+  }, [urlParams.density]);
+
+  useEffect(() => {
+    // Apply motion disabled
+    import('@cloudscape-design/global-styles').then(({ disableMotion }) => {
+      disableMotion(urlParams.motionDisabled);
+    });
+  }, [urlParams.motionDisabled]);
+
+  useEffect(() => {
+    // Apply direction
+    document.documentElement.setAttribute('dir', urlParams.direction);
+  }, [urlParams.direction]);
+
+  return null;
+}
+
+/**
+ * App shell component that wraps demo pages
+ * Similar to pages/app/index.tsx but for SSR
+ */
+export default function App({ pageId, urlParams: initialUrlParams, isServer, children }: AppProps) {
+  const [urlParams, setUrlParamsState] = useState(initialUrlParams);
+  const isAppLayout = isAppLayoutPage(pageId);
+  const ContentTag = isAppLayout ? 'div' : 'main';
+
+  // Update URL params and sync to URL
+  const setUrlParams = (newParams: Partial<URLParams>) => {
+    const updatedParams = { ...urlParams, ...newParams };
+    setUrlParamsState(updatedParams);
+
+    // Update URL without reload (except for visualRefresh which needs reload)
+    if (!isServer && !('visualRefresh' in newParams)) {
+      const newUrl = pageId ? `/${pageId}${formatURLParams(updatedParams)}` : `/${formatURLParams(updatedParams)}`;
+      window.history.replaceState({}, '', newUrl);
+    }
+  };
+
+  // Header is always rendered outside the error boundary so users can still
+  // toggle settings (like visual refresh) even when a page throws an error
+  const header = (
+    <Header
+      sticky={isAppLayout && pageId !== undefined && !pageId.includes('legacy')}
+      urlParams={urlParams}
+      setUrlParams={setUrlParams}
+    />
+  );
+
+  // Page content is wrapped in error boundary (client-side only)
+  const pageContent = isServer ? children : <ErrorBoundary pageId={pageId}>{children}</ErrorBoundary>;
+
+  // Wrap in Suspense on client side only (not supported in React 16 SSR)
+  const suspenseWrapped = isServer ? (
+    pageContent
+  ) : (
+    <Suspense fallback={<span>Loading...</span>}>{pageContent}</Suspense>
+  );
+
+  return (
+    <AppContext.Provider value={{ pageId, urlParams, isServer, setUrlParams }}>
+      {/* Client-side effects for applying global styles */}
+      {!isServer && <ClientEffects urlParams={urlParams} />}
+
+      <ContentTag>
+        {header}
+        {suspenseWrapped}
+      </ContentTag>
+    </AppContext.Provider>
+  );
+}

dev-server/collect-styles.mjs

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+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+import { glob } from 'glob';
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const rootDir = path.resolve(__dirname, '..');
+const componentsDir = path.resolve(rootDir, 'lib/components');
+
+let cachedStyles = null;
+
+/**
+ * Gets the global styles CSS from @cloudscape-design/global-styles
+ */
+function getGlobalStyles() {
+  try {
+    // Find the global-styles package in node_modules
+    const globalStylesPath = path.resolve(rootDir, 'node_modules/@cloudscape-design/global-styles/index.css');
+    return fs.readFileSync(globalStylesPath, 'utf-8');
+  } catch (e) {
+    console.warn('Warning: Could not read global styles:', e.message);
+    return '';
+  }
+}
+
+/**
+ * Collects all scoped CSS files from the built component library
+ * and combines them into a single CSS string for SSR injection.
+ * Also includes global styles from @cloudscape-design/global-styles.
+ */
+export function collectStyles() {
+  // Return cached styles if available (for performance)
+  if (cachedStyles !== null) {
+    return cachedStyles;
+  }
+
+  // Start with global styles
+  const globalStyles = getGlobalStyles();
+
+  const cssFiles = glob.sync('**/*.scoped.css', {
+    cwd: componentsDir,
+    absolute: true,
+  });
+
+  const componentStyles = cssFiles
+    .map(file => {
+      try {
+        return fs.readFileSync(file, 'utf-8');
+      } catch (e) {
+        console.warn(`Warning: Could not read CSS file ${file}:`, e.message);
+        return '';
+      }
+    })
+    .filter(Boolean)
+    .join('\n');
+
+  // Combine global styles first, then component styles
+  cachedStyles = globalStyles + '\n' + componentStyles;
+  return cachedStyles;
+}
+
+/**
+ * Clears the cached styles (useful for development when styles change)
+ */
+export function clearStyleCache() {
+  cachedStyles = null;
+}