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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 Docs > API > import.meta for complete documentation.

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