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test/parallel/test-messaging-marktransfermode.js

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+// Flags: --expose-internals
+'use strict';
+
+const common = require('../common');
+
+const assert = require('assert');
+const { E, F } = require('internal/test/transfer');
+
+// Tests that F is transferable even tho it does not directly,
+// observably extend the JSTransferable class.
+
+const mc = new MessageChannel();
+
+mc.port1.onmessageerror = common.mustNotCall();
+
+mc.port1.onmessage = common.mustCall(({ data }) => {
+  assert(data instanceof F);
+  assert(data instanceof E);
+  assert.strictEqual(data.b, 1);
+  mc.port1.close();
+});
+
+mc.port2.postMessage(new F(1));