TEST: Add a NS2 test (finally) (#458)

FixJSDOMEnvironment.ts

@@ -0,0 +1,15 @@
+import JSDOMEnvironment from "jest-environment-jsdom";
+
+// https://github.com/facebook/jest/blob/v29.4.3/website/versioned_docs/version-29.4/Configuration.md#testenvironment-string
+export default class FixJSDOMEnvironment extends JSDOMEnvironment {
+  constructor(...args: ConstructorParameters<typeof JSDOMEnvironment>) {
+    super(...args);
+
+    // FIXME https://github.com/nodejs/node/issues/35889
+    // Add missing importActual() function to mirror requireActual(),
+    // which lets us work around the ESM bug.
+    // Wrap the construction of the function in eval, so that transpilers
+    // don't touch the import() call.
+    this.global.importActual = eval("url => import(url)");
+  }
+}