Repro of serialport/node-serialport#1938

.gitignore

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+node_modules

main.js

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+import { isMainThread, Worker } from "node:worker_threads";
+
+if (isMainThread) {
+  const worker = new Worker("./worker.js");
+  worker.on("exit", (code) => {
+    console.log(`Worker excited with code ${code}`);
+  });
+
+  setTimeout(() => {
+    worker.postMessage({
+      type: "stop",
+    });
+  }, 5000);
+}

package.json

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+{
+  "name": "serial-port-1938",
+  "version": "1.0.0",
+  "description": "Repro of https://github.com/serialport/node-serialport/issues/1938",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "license": "MIT",
+  "dependencies": {
+    "serialport": "^12.0.0"
+  }
+}

worker.js

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+import { isMainThread, parentPort } from "node:worker_threads";
+import { SerialPort, ReadlineParser } from "serialport";
+
+async function main() {
+  await new Promise((resolve) => {
+    const port = new SerialPort({
+      path: "/dev/tty.usbmodem101", // Replace with valid path
+      baudRate: 115200,
+      parser: new ReadlineParser({
+        delimiter: "\r\n",
+      }),
+    });
+
+    port.on("data", (data) => {
+      console.log(data);
+    });
+
+    parentPort.on("message", (message) => {
+      if (message.type === "stop") {
+        resolve();
+      }
+    });
+  });
+}
+
+if (!isMainThread) {
+  main();
+}