Add JavaScript and TypeScript reference adapter

tests/fixtures/reference-javascript/src/app/index.js

@@ -0,0 +1,8 @@
+import { Service } from "./service.mjs";
+export { clamp } from "./shared.js";
+
+throw new Error("The reference adapter must never execute project code");
+
+export function applicationName() {
+  return Service.name;
+}