Add test for async iterator body to adapter-node & handle empty headers

Author: jesseskinner

packages/adapter-node/src/kit-middleware.js

@@ -41,7 +41,7 @@ export function create_kit_middleware({ render }) {
 				typeof rendered.body === 'object' &&
 				typeof rendered.body[Symbol.asyncIterator] === 'function'
 			) {
-				const flush = compressible(rendered.headers['content-type']) ? res.flush : null;
+				const flush = rendered.headers && compressible(rendered.headers['content-type']) ? res.flush : null;
 				const data = Readable.from(rendered.body);
 				data.on('error', () => res.end());
 				if (flush) {

packages/adapter-node/tests/smoke.js

@@ -68,4 +68,22 @@ test('serve a 400 when we have a malformed url', async () => {
 	server.server.close();
 });
 
+test('handles an async iterator body', async () => {
+	const server = await startServer({
+		render: (incoming) => {
+			return {
+				status: 200,
+				body: (async function* () {
+					yield 'foo';
+					yield 'bar';
+				})()
+			};
+		}
+	});
+
+	const res = await fetch(`http://localhost:${PORT}`);
+	assert.equal(await res.text(), 'foobar');
+	server.server.close();
+});
+
 test.run();