fix(ext/http): Deno.Server should not be thenable (#20723)

Otherwise you can not return `Deno.Server` from async functions.

Co-authored-by: Yoshiya Hinosawa <stibium121@gmail.com>
Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/cli/tests/unit/serve_test.ts b/cli/tests/unit/serve_test.ts
index 6f58db006..2e560af99 100644
--- a/cli/tests/unit/serve_test.ts
+++ b/cli/tests/unit/serve_test.ts
@@ -3717,6 +3717,17 @@ async function curlRequestWithStdErr(args: string[]) {
   return [new TextDecoder().decode(stdout), new TextDecoder().decode(stderr)];
 }
 
+Deno.test("Deno.Server is not thenable", async () => {
+  // deno-lint-ignore require-await
+  async function serveTest() {
+    const server = Deno.serve({ port: servePort }, (_) => new Response(""));
+    assert(!("then" in server));
+    return server;
+  }
+  const server = await serveTest();
+  await server.shutdown();
+});
+
 Deno.test(
   {
     ignore: Deno.build.os === "windows",