Nodejs threads creating threads - demonstrates that if the intermediary thread dies, the child thread can't access the main thread

index.js

const { Worker, isMainThread, parentPort, threadId } = require('worker_threads');

if (isMainThread) {
    const worker = new Worker(__filename);

    worker.on('message', (msg) => {
        console.log(`${msg}`);
    });

    worker.postMessage('main >');
} else {
    parentPort.on('message', (message) => {
        const innerWorker = new Worker('./thread2.js');
        innerWorker.postMessage(message + threadId + '> ');

        innerWorker.on('message', (msg) => {
            parentPort.postMessage(msg)
        });

        setTimeout(() => {
            innerWorker.terminate()
        }, 2000);
    });
}

thread2.js

const { Worker, isMainThread, parentPort, threadId } = require('worker_threads');

if (isMainThread) {
} else {
    parentPort.on('message', (message) => {
        const innerWorker = new Worker('./thread3.js');
        innerWorker.postMessage(message + threadId + '> ');

        innerWorker.on('message', (msg) => {
            parentPort.postMessage(msg)
        });

    });
}

thread3.js

const { Worker, isMainThread, parentPort, threadId } = require('worker_threads');

if (isMainThread) {
} else {
    parentPort.on('message', (message) => {
            // This works even with sync execution
//         let lastExecuted = Date.now();
//         while (true) {
//             if (Date.now() - lastExecuted > 900) {
//                 parentPort.postMessage(message + threadId);
//                 lastExecuted = Date.now();
//             }
//         }
        setInterval(() => {
            parentPort.postMessage(message + threadId);
        }, 1000);
    });
}