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;
+}

tests/fixtures/reference-javascript/src/app/service.mjs

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+import { clamp } from "./shared.js";
+
+export class Service {
+  run(value) {
+    return clamp(value);
+  }
+}
+
+export const buildService = (enabled) => {
+  if (enabled) {
+    return new Service();
+  }
+  return null;
+};

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

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+export const DEFAULT_LIMIT = 3;
+
+export function clamp(value, limit = DEFAULT_LIMIT) {
+  if (value < 0) {
+    return 0;
+  }
+  if (value > limit) {
+    return limit;
+  }
+  return value;
+}

tests/fixtures/reference-javascript/src/app/worker.cjs

@@ -0,0 +1,5 @@
+export { Service } from "./service.mjs";
+
+export function execute(worker, value) {
+  return worker.run(value);
+}