Add stub for ESM

PR-URL: #117
metarhia · Oct 25, 2023 · f2e0a2a · f2e0a2a
1 parent c530668
commit f2e0a2a
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diff --git a/metavm.js b/metavm.js
@@ -19,6 +19,7 @@ const CONTEXT_OPTIONS = {
 const MODULE_TYPE = {
   METARHIA: 1,
   COMMONJS: 2,
+  ECMA: 3,
 };
 
 const DEFAULT = {
@@ -87,6 +88,9 @@ const internalRequire = require;
 
 class MetaScript {
   constructor(name, src, options = {}) {
+    if (options.type === MODULE_TYPE.ECMA) {
+      throw new Error('ECMAScript modules is not supported');
+    }
     this.name = name;
     this.dirname = options.dirname || process.cwd();
     this.relative = options.relative || '.';

diff --git a/test/unit.js b/test/unit.js
@@ -455,3 +455,21 @@ test('Check native fetch', async () => {
   assert.ok(proto);
   assert.strictEqual(proto.constructor.name, 'AsyncFunction');
 });
+
+test('ECMAScript modules', async () => {
+  const sandbox = {};
+  sandbox.global = sandbox;
+  const src = `const fn = x => x;
+export { fn };
+`;
+  try {
+    const ms = metavm.createScript('Example', src, {
+      context: metavm.createContext(sandbox),
+      dirname: __dirname,
+      type: metavm.MODULE_TYPE.ECMA,
+    });
+    test.fail(ms);
+  } catch (err) {
+    assert.ok(err);
+  }
+});