Flagged SSR support (#2548)

* Checkpoint, basics are working

* Add the `--experimental-ssr` flag

* Adds the changeset

* Fixes population of getStaticPaths results

* Pass through the imported module

* Route manifest test

* Fix remaining tests

* Fix remaining tests

* Copy server assets over

* Fix types

* Allowing passing in the request to the Node version of App

* Improve the example app

* Gets CI to pass

4 files changed, 149 insertions, 0 deletions

diff --git a/examples/ssr/server/api.mjs b/examples/ssr/server/api.mjs
new file mode 100644
index 000000000..3928d0507
--- /dev/null
+++ b/examples/ssr/server/api.mjs
@@ -0,0 +1,49 @@
+import fs from 'fs';
+const dbJSON = fs.readFileSync(new URL('./db.json', import.meta.url));
+const db = JSON.parse(dbJSON);
+const products = db.products;
+const productMap = new Map(products.map(product => [product.id, product]));
+
+const routes = [
+	{
+		match: /\/api\/products\/([0-9])+/,
+		async handle(_req, res, [,idStr]) {
+			const id = Number(idStr);
+			if(productMap.has(id)) {
+				const product = productMap.get(id);
+				res.writeHead(200, {
+					'Content-Type': 'application/json'
+				});
+				res.end(JSON.stringify(product));
+			} else {
+				res.writeHead(404, {
+					'Content-Type': 'text/plain'
+				});
+				res.end('Not found');
+			}
+		}
+	},
+	{
+		match: /\/api\/products/,
+		async handle(_req, res) {
+			res.writeHead(200, {
+				'Content-Type': 'application/json',
+			});
+			res.end(JSON.stringify(products));
+		}
+	}
+
+]
+
+export async function apiHandler(req, res) {
+	for(const route of routes) {
+		const match = route.match.exec(req.url);
+		if(match) {
+			return route.handle(req, res, match);
+		}
+	}
+	res.writeHead(404, {
+		'Content-Type': 'text/plain'
+	});
+	res.end('Not found');
+}
diff --git a/examples/ssr/server/db.json b/examples/ssr/server/db.json
new file mode 100644
index 000000000..76f9e4da3
--- /dev/null
+++ b/examples/ssr/server/db.json
@@ -0,0 +1,28 @@
+{
+  "products": [
+    {
+      "id": 1,
+      "name": "Cereal",
+      "price": 3.99,
+      "image": "/images/products/cereal.jpg"
+    },
+    {
+      "id": 2,
+      "name": "Yogurt",
+      "price": 3.97,
+      "image": "/images/products/yogurt.jpg"
+    },
+    {
+      "id": 3,
+      "name": "Rolled Oats",
+      "price": 2.89,
+      "image": "/images/products/oats.jpg"
+    },
+    {
+      "id": 4,
+      "name": "Muffins",
+      "price": 4.39,
+      "image": "/images/products/muffins.jpg"
+    }
+  ]
+}
diff --git a/examples/ssr/server/dev-api.mjs b/examples/ssr/server/dev-api.mjs
new file mode 100644
index 000000000..74e0ef83b
--- /dev/null
+++ b/examples/ssr/server/dev-api.mjs
@@ -0,0 +1,17 @@
+import { createServer } from 'http';
+import { apiHandler } from './api.mjs';
+
+const PORT = process.env.PORT || 8085;
+
+const server = createServer((req, res) => {
+	apiHandler(req, res).catch(err => {
+		console.error(err);
+		res.writeHead(500, {
+			'Content-Type': 'text/plain'
+		});
+		res.end(err.toString());
+	})
+});
+
+server.listen(PORT);
+console.log(`API running at http://localhost:${PORT}`);
diff --git a/examples/ssr/server/server.mjs b/examples/ssr/server/server.mjs
new file mode 100644
index 000000000..6f0a0dea6
--- /dev/null
+++ b/examples/ssr/server/server.mjs
@@ -0,0 +1,55 @@
+import { createServer } from 'http';
+import fs from 'fs';
+import mime from 'mime';
+import { loadApp } from 'astro/app/node';
+import { polyfill } from '@astropub/webapi'
+import { apiHandler } from './api.mjs';
+
+polyfill(globalThis);
+
+const clientRoot = new URL('../dist/client/', import.meta.url);
+const serverRoot = new URL('../dist/server/', import.meta.url);
+const app = await loadApp(serverRoot);
+
+async function handle(req, res) {
+	const route = app.match(req);
+
+	if(route) {
+		const html = await app.render(req, route);
+
+		res.writeHead(200, {
+			'Content-Type': 'text/html'
+		});
+		res.end(html)
+	} else if(/^\/api\//.test(req.url)) {
+		return apiHandler(req, res);
+	} else {
+		let local = new URL('.' + req.url, clientRoot);
+		try {
+			const data = await fs.promises.readFile(local);
+			res.writeHead(200, {
+				'Content-Type': mime.getType(req.url)
+			});
+			res.end(data);
+		} catch {
+			res.writeHead(404);
+			res.end();
+		}
+	}
+}
+
+const server = createServer((req, res) => {
+	handle(req, res).catch(err => {
+		console.error(err);
+		res.writeHead(500, {
+			'Content-Type': 'text/plain'
+		});
+		res.end(err.toString());
+	})
+});
+
+server.listen(8085);
+console.log('Serving at http://localhost:8085');
+
+// Silence weird <time> warning
+console.error = () => {};