Check if the current file is the entrypoint

Bun provides a handful of module-specific utilities on the import.meta object. Use import.meta.main to check if the current file is the entrypoint of the current process.

index.ts

if (import.meta.main) {
  // this file is directly executed with `bun run`
} else {
  // this file is being imported by another file
}

See import.meta.