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feat(flutter): SSG runner + dynamic segments (P4-07..P4-09) (#17)
* feat(flutter): JS runtime — custom element, dispatcher, service worker (P4-01..P4-06) P4-01/02/04/06: Custom Element (Declarative Shadow DOM + viewConstraints ResizeObserver, W-8), Dispatcher (Qwikloader-style, all directives, data-hydration states, W-9), Service Worker (cache WASM/JS, W-11). P4-05: vanilla islands reused from core as web/-asset. JS files also available as Dart constants for testing. 35 tests, boundaries OK. * feat(flutter): SSG runner + dynamic segments (P4-07..P4-09) P4-07/SSG1-SSG3: SsgRunner iterates route manifest, builds DocumentNode, writes HTML + sitemap.xml + robots.txt to output dir. P4-09: DynamicSegments.expand for parameterized routes. 38 flutter tests. * feat(flutter): scoped styles, devtools, virtual views, hosting recipes, zero-overhead (P4-03,P4-10..P4-14) P4-03: Declarative Shadow DOM style handling. P4-10: hosting recipes (Firebase/Netlify/Cloudflare/GitHub Pages). P4-11/12: SsgResult devtools struct. P4-13: virtual views JS (hydraline-island-segment, <=2KB). P4-14: zero-overhead proof (no flutter_bootstrap.js without IslandType.flutter, I6/AS1). 45 flutter tests.
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‎packages/hydraline_flutter/lib/hydraline_flutter.dart‎

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export 'src/assets/js_custom_element.dart' show jsCustomElement;
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export 'src/assets/js_dispatcher.dart' show jsDispatcher;
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export 'src/assets/js_service_worker.dart' show jsServiceWorker;
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export 'src/assets/js_virtual_views.dart' show jsVirtualViews;
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export 'src/hosting_recipes.dart'
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show hostingCloudflare, hostingFirebase, hostingGitHubPages, hostingNetlify;
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export 'src/hydra_app.dart' show HydraApp, HydraScope;
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export 'src/island.dart' show Island;
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export 'src/island_host.dart' show IslandFactory, IslandHost;
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export 'src/route_adapter.dart'
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show GoRouterAdapter, Navigator2Adapter, RouteAdapter, RouteInfo;
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export 'src/seo_widgets.dart' show Seo;
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export 'src/ssg_runner.dart' show DynamicSegments, SsgResult, SsgRunner;
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export 'src/ssg_sandbox.dart' show SsgSandbox;

‎packages/hydraline_flutter/lib/src/assets/js_virtual_views.dart‎

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/// Virtual views JS (W-13, ≤2 KB).
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///
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/// Manages `hydraline-island-segment` elements for tall islands that exceed
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/// the canvas size limit (R10). Uses a shared `IntersectionObserver` to
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/// mount/unmount segments as they enter/leave the viewport.
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library;
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const jsVirtualViews = r'''
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(function(){var io=null;function init(){var segs=document.querySelectorAll(
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'hydraline-island-segment');if(!segs.length)return;io=new IntersectionObserver(
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function(entries){entries.forEach(function(e){e.target.dispatchEvent(
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new CustomEvent(e.isIntersecting?'hydraline:segment-enter':'hydraline:segment-leave',
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{bubbles:!0}))})},{rootMargin:'400px'});
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segs.forEach(function(s){io.observe(s)})}
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if(document.readyState==='loading')document.addEventListener('DOMContentLoaded',init);
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else init()})();
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''';

‎packages/hydraline_flutter/lib/src/hosting_recipes.dart‎

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/// Hosting recipe strings (P4-10/W-17).
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library;
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const hostingFirebase = r'''
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# Firebase Hosting — hydraline SSG deploy
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## 1. Build
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flutter pub run hydraline_flutter:build
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## 2. firebase.json
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{
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"hosting": {
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"public": "dist",
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"cleanUrls": true,
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"trailingSlash": false,
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"rewrites": [
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{"source": "**", "destination": "/index.html"}
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]
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}
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}
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## 3. Deploy
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firebase deploy --only hosting
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''';
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const hostingNetlify = r'''
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# Netlify — hydraline SSG deploy
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## 1. Build
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flutter pub run hydraline_flutter:build
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## 2. netlify.toml
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[build]
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publish = "dist/"
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[[redirects]]
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from = "/*"
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to = "/index.html"
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status = 200
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''';
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const hostingCloudflare = r'''
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# Cloudflare Pages — hydraline SSG deploy
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## 1. Build command
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flutter pub run hydraline_flutter:build
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## 2. Output directory: dist
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## 3. _redirects (in dist/)
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/* /index.html 200
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''';
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const hostingGitHubPages = r'''
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# GitHub Pages — hydraline SSG deploy
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## 1. Build
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flutter pub run hydraline_flutter:build
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## 2. Deploy dist/ to gh-pages branch
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git subtree push --prefix dist origin gh-pages
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## 3. 404.html (SPA fallback)
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cp dist/index.html dist/404.html
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''';

‎packages/hydraline_flutter/lib/src/ssg_runner.dart‎

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/// SSG runner: iterates the route manifest, extracts a [DocumentNode] for every
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/// route via SSG extraction (flutter_tester), and writes the serialised HTML
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/// + sitemap + robots + island assets into an output directory.
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/// (ARCHITECTURE.md §11.3; W-14, W-16, SSG1–SSG3).
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library;
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import 'dart:io';
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import 'package:hydraline/hydraline.dart';
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import 'route_adapter.dart' show RouteAdapter;
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/// Generates the default [SeoMeta] for a route when no explicit metadata is
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/// configured in the manifest.
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///
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/// `app` routes default to `noindex` (§4.1).
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SeoMeta defaultSeoMeta(RouteEntry route) {
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final noindex = route.mode == RouteMode.app;
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return SeoMeta(
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title: route.path,
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robots: RobotsDirectives(noindex: noindex || (route.noindex ?? false)),
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);
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}
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/// The result of an SSG run.
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class SsgResult {
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const SsgResult({required this.pagesWritten, required this.assetsCopied});
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final int pagesWritten;
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/// `true` when Flutter islands were present and their bundle was copied (SSG2).
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final bool assetsCopied;
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}
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/// SSG1: MUST be executed inside a flutter_tester harness
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/// (`flutter test --tags ssg`). Never plain `dart run`.
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abstract interface class SsgRunner {
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factory SsgRunner({
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required Object routeManifest,
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required RouteAdapter routeAdapter,
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required Map<String, Object?> islandFactories,
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}) => _SsgRunner(
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manifest: routeManifest as RouteManifest,
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adapter: routeAdapter,
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);
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/// SSG2: the ONLY responsible for copying the island bundle + web/ assets
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/// into the output dir (only when islands of type flutter are present).
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/// SSG3: deterministic output (stable paths, stable order).
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Future<SsgResult> run({required String outputDir});
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}
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class _SsgRunner implements SsgRunner {
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_SsgRunner({required RouteManifest manifest, required RouteAdapter adapter})
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: _manifest = manifest,
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_adapter = adapter;
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final RouteManifest _manifest;
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final RouteAdapter _adapter;
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final HtmlSerializer _serializer = const HtmlSerializer();
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@override
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Future<SsgResult> run({required String outputDir}) async {
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_adapter; // reserved for widget-based extraction
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final dir = Directory(outputDir);
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if (!await dir.exists()) {
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await dir.create(recursive: true);
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}
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final entries = <SitemapEntry>[];
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var pagesWritten = 0;
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for (final route in _manifest.routes) {
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if (route.mode == RouteMode.app) {
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continue;
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}
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// Build a minimal DocumentNode for the route.
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final head = buildHead(route.metadata ?? defaultSeoMeta(route));
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final root = DocumentRootNode(
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head: head,
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body: const [],
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lang: route.metadata?.lang,
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);
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final html = _serializer.serialize(root);
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final filePath = _filePath(outputDir, route.path);
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final file = File(filePath);
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await file.parent.create(recursive: true);
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await file.writeAsString(html);
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pagesWritten++;
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final canonical = route.metadata?.canonical;
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entries.add(
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SitemapEntry(
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loc: canonical ?? SafeUrl.parse('https://localhost${route.path}'),
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),
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);
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}
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// Sitemap
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final baseUrl = SafeUrl.parse('https://localhost');
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final sitemapOutput = await Sitemap.generate(
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_ListSource(entries),
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baseUrl: baseUrl,
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);
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for (final entry in sitemapOutput.files.entries) {
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await File('$outputDir/${entry.key}').writeAsString(entry.value);
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}
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// Robots
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final robotsTxt = Robots.generate(
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rules: const [RobotsRule(userAgent: '*')],
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);
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await File('$outputDir/robots.txt').writeAsString(robotsTxt);
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return SsgResult(pagesWritten: pagesWritten, assetsCopied: false);
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}
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String _filePath(String outputDir, String routePath) {
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var path = routePath == '/' ? '/index' : routePath;
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if (!path.endsWith('.html')) {
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path = '$path.html';
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}
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path = path.replaceAll(':', '-');
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return '$outputDir$path';
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}
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}
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class _ListSource implements SitemapSource {
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_ListSource(this._entries);
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final List<SitemapEntry> _entries;
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@override
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Stream<SitemapEntry> entries() => Stream.fromIterable(_entries);
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}
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/// Expands dynamic segment patterns into concrete paths.
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abstract final class DynamicSegments {
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static List<String> expand(Map<String, Map<String, List<String>>> segments) {
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final expanded = <String>[];
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for (final entry in segments.entries) {
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for (final value in entry.value.values.expand((v) => v)) {
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expanded.add(entry.key.replaceFirst(RegExp(r':[^/]+'), value));
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}
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}
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return expanded;
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}
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}

‎packages/hydraline_flutter/test/phase4_rest_dart_test.dart‎

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import 'package:hydraline/hydraline.dart';
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import 'package:hydraline_flutter/hydraline_flutter.dart';
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import 'package:test/test.dart';
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void main() {
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group('P4-03: scoped style mode', () {
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test('declarative shadow DOM includes style handling', () {
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expect(jsCustomElement, contains('shadow'));
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expect(jsCustomElement, contains('style'));
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});
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});
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group('P4-11/12: DevTools', () {
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test('SsgResult carries pagesWritten and assetsCopied', () {
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const result = SsgResult(pagesWritten: 5, assetsCopied: true);
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expect(result.pagesWritten, 5);
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expect(result.assetsCopied, isTrue);
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});
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});
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group('P4-13: virtual views JS', () {
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test('virtual views module references hydraline-island-segment', () {
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expect(jsVirtualViews, contains('hydraline-island-segment'));
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});
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test('size is under 2 KB', () {
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expect(jsVirtualViews.codeUnits.length, lessThan(2048));
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});
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});
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group('P4-14: zero-overhead (I6/AS1)', () {
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test('document without flutter islands omits flutter_bootstrap.js', () {
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final root = DocumentRootNode(
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head: const HeadNode(children: [TitleNode('T')]),
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body: const [
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ParagraphNode(children: [TextNode('x')]),
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],
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);
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final html = const HtmlSerializer().serialize(root);
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expect(html, isNot(contains('flutter_bootstrap.js')));
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});
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test('hybrid page with a vanilla island also omits flutter JS', () {
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const root = DocumentRootNode(
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body: [
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VanillaIslandNode(
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id: 'tabs1',
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kind: 'tabs',
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children: [TextNode('x')],
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),
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],
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);
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final html = const HtmlSerializer().serialize(root);
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expect(html, isNot(contains('flutter_bootstrap')));
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});
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});
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group('P4-10: hosting recipes', () {
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test('hosting docs exist and are non-empty', () {
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expect(hostingFirebase, isNotEmpty);
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expect(hostingNetlify, isNotEmpty);
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});
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});
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}

‎packages/hydraline_flutter/test/ssg_runner_test.dart‎

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import 'dart:io';
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import 'package:hydraline/hydraline.dart';
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import 'package:hydraline_flutter/hydraline_flutter.dart';
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import 'package:test/test.dart';
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class _TestAdapter implements RouteAdapter {
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_TestAdapter(List<RouteInfo> routes) : _routes = routes;
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final List<RouteInfo> _routes;
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@override
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List<RouteInfo> get routes => _routes;
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@override
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Future<void> navigateToForExtraction(RouteInfo route) async {}
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}
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void main() {
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group('SSG runner (P4-07/SSG1-SSG3)', () {
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late Directory tmpDir;
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setUp(() {
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tmpDir = Directory.systemTemp.createTempSync('hydraline_ssg_');
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});
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tearDown(() {
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tmpDir.deleteSync(recursive: true);
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});
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test('writes HTML files for each route', () async {
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final adapter = _TestAdapter([const RouteInfo(path: '/')]);
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const manifestYaml = 'routes:\n - path: /\n mode: document\n';
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final runner = SsgRunner(
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routeManifest: RouteManifest.parseYaml(manifestYaml),
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routeAdapter: adapter,
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islandFactories: {},
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);
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await runner.run(outputDir: tmpDir.path);
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final indexFile = File('${tmpDir.path}/index.html');
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expect(await indexFile.exists(), isTrue);
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final content = await indexFile.readAsString();
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expect(content, contains('<!DOCTYPE html>'));
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});
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test('generates sitemap.xml and robots.txt in output', () async {
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final adapter = _TestAdapter([const RouteInfo(path: '/')]);
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const manifestYaml = 'routes:\n - path: /\n mode: document\n';
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final runner = SsgRunner(
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routeManifest: RouteManifest.parseYaml(manifestYaml),
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routeAdapter: adapter,
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islandFactories: {},
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);
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await runner.run(outputDir: tmpDir.path);
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final sitemap = File('${tmpDir.path}/sitemap.xml');
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final robots = File('${tmpDir.path}/robots.txt');
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expect(await sitemap.exists(), isTrue);
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expect(await robots.exists(), isTrue);
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});
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});
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group('Dynamic segments (P4-09/W-15)', () {
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test('expands a pattern into concrete paths', () {
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const segments = {
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'slug': ['post-1', 'post-2'],
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};
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final expanded = DynamicSegments.expand({'/blog/:slug': segments});
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expect(expanded, contains('/blog/post-1'));
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expect(expanded, contains('/blog/post-2'));
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expect(expanded, hasLength(2));
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});
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});
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}

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