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Bun supports the Node.js process global, including the process.on() method for listening to OS signals. 
process.on("SIGINT", () => {
  console.log("Received SIGINT");
});
If you don’t know which signal to listen for, listen for the "beforeExit" and "exit" events. 
process.on("beforeExit", code => {
  console.log(`Event loop is empty!`);
});

process.on("exit", code => {
  console.log(`Process is exiting with code ${code}`);
});
See Utils for more utilities.