detect whether ES Module is run from command line in Node

by

Use

if (import.meta.url === `file://${process.argv[1]}`) {
  // module was not imported but called directly
}

See the MDN docs on import.meta for details.

Update Sep 27, 2021

Perhaps more robust, but involving an extra import (via Rich Harris)

import { pathToFileURL } from 'url'

if (import.meta.url === pathToFileURL(process.argv[1]).href) {
  // module was not imported but called directly
}

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