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test/parallel/test-worker-stdio-from-preload-module.js

@@ -0,0 +1,20 @@
+'use strict';
+const common = require('../common');
+const fixtures = require('../common/fixtures');
+const { Worker } = require('worker_threads');
+const assert = require('assert');
+
+// Regression test for https://github.com/nodejs/node/issues/31777:
+// stdio operations coming from preload modules should count towards the
+// ref count of the internal communication port on the Worker side.
+
+for (let i = 0; i < 10; i++) {
+  const w = new Worker('console.log("B");', {
+    execArgv: ['--require', fixtures.path('printA.js')],
+    eval: true,
+    stdout: true
+  });
+  w.on('exit', common.mustCall(() => {
+    assert.strictEqual(w.stdout.read().toString(), 'A\nB\n');
+  }));
+}