complete performance and reliability follow-ups

packages/uploader/test/uploader.test.ts

@@ -11,6 +11,12 @@ import {
   upload,
   verifySignedFileToken,
 } from "../src/index.ts";
+import { UPLOAD_RUNTIME } from "../src/runtime.ts";
+
+test("browser upload response parse failures emit a diagnostic", () => {
+  expect(UPLOAD_RUNTIME).toContain("upload response was not valid JSON");
+  expect(UPLOAD_RUNTIME).not.toContain("catch (e2) {}");
+});
 
 function configure() {
   configureStorage(