diff --git a/package.json b/package.json
index fc5a376..e6fc97f 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "type": "module",
   "main": "retrieveGlobals.js",
   "scripts": {
-    "test": "npx ava"
+    "test": "NODE_OPTIONS='--experimental-vm-modules' npx ava"
   },
   "repository": {
     "type": "git",
diff --git a/retrieveGlobals.js b/retrieveGlobals.js
index 8df9caf..806f351 100644
--- a/retrieveGlobals.js
+++ b/retrieveGlobals.js
@@ -35,7 +35,10 @@ class RetrieveGlobals {
 		// to `const ___ = await import(___)`
 		// to emulate *some* import syntax.
 		// Doesn’t currently work with aliases (mod as name) or namespaced imports (* as name).
-		if(this.options.transformEsmImports) {
+		if(this.options.transformEsmImports === "require") {
+			let it = new ImportTransformer(this.originalCode);
+			this.code = it.transformToRequire();
+		} else if(this.options.transformEsmImports) {
 			let it = new ImportTransformer(this.originalCode);
 			this.code = it.transformToDynamicImport();
 		} else {
diff --git a/test/test.js b/test/test.js
index dc56a1a..1bbe065 100644
--- a/test/test.js
+++ b/test/test.js
@@ -100,15 +100,6 @@ test("destructured assignment via Array", async t => {
 	t.is(ret.b, 2);
 });
 
-
-test("dynamic import", async t => {
-	let vm = new RetrieveGlobals(`const { noop } = await import("@zachleat/noop");`);
-	let ret = await vm.getGlobalContext(undefined, {
-		dynamicImport: true
-	});
-	t.is(typeof ret.noop, "function");
-});
-
 test("global: same console.log", async t => {
 	let vm = new RetrieveGlobals(`const b = console.log`);
 	let ret = await vm.getGlobalContext(undefined, {
@@ -147,14 +138,41 @@ const b = 1;`);
 	t.is(ret.b, 1);
 });
 
-test("ESM import", async t => {
+test("dynamic import (no code transformation) (requires --experimental-vm-modules in Node v20.10)", async t => {
+	let vm = new RetrieveGlobals(`const { noop } = await import("@zachleat/noop");`);
+	let ret = await vm.getGlobalContext(undefined, {
+		dynamicImport: true
+	});
+	t.is(typeof ret.noop, "function");
+});
+
+test("ESM import (requires --experimental-vm-modules in Node v20.10)", async t => {
 	let vm = new RetrieveGlobals(`import { noop } from "@zachleat/noop";
 const b = 1;`, {
 		transformEsmImports: true,
 	});
 	let ret = await vm.getGlobalContext(undefined, {
-		dynamicImport: true
+		dynamicImport: true,
 	});
 	t.is(typeof ret.noop, "function");
 	t.is(ret.b, 1);
-});
\ No newline at end of file
+});
+
+test("ESM import (fallback to `require`)", async t => {
+	let vm = new RetrieveGlobals(`import { noop } from "@zachleat/noop";
+const b = 1;`, {
+		transformEsmImports: "require",
+	});
+
+	let ret = await vm.getGlobalContext(undefined, {
+		addRequire: true,
+	});
+
+	t.is(typeof ret.noop, "function");
+	t.is(ret.b, 1);
+});
+
+// test("__filename", t => {
+// 	let vm = new RetrieveGlobals("var b = __filename;");
+// 	t.deepEqual(vm.getGlobalContextSync({}, { reuseGlobal: true }), { b: __filename });
+// });
\ No newline at end of file