What happens if a worker process crashes in a Node.js cluster setup with the following code?

What happens if a worker process crashes in a Node.js cluster setup with the following code?

const cluster = require('cluster');
if (cluster.isPrimary) {
  cluster.fork();
  cluster.on('exit', (worker) => {
    console.log(`Worker ${worker.process.pid} died`);
    cluster.fork();
  });
}