Check if JS script is being invoked directly in Node

check-if-directly-invoked.js

// In CommonJS format:
if (require.main === module) {
  console.log("Invoked directly!")
}

// In ES module format:
if (import.meta.url.includes(process.argv[1])) {
  console.log("Invoked directly!")
}

// CAVEAT: I don't actually how robust the ES module format is; it's just the
// first solution that occurred to me.