Native modül, default export'lu örnek

index.js

import sleep from './utils.js'

console.log(`3000 milisaniye uyuyalım `);
sleep(3000);

package.json

{
  "name": "moduller",
  "type": "module"
}

utils.js

const DEFAULT_SLEEP_MILLISECONDS = 1000;

function sleep(milliseconds) {
  return new Promise(resolve =>
    setTimeout(resolve, milliseconds || DEFAULT_SLEEP_MILLISECONDS)
  );
}

export default sleep;
export { DEFAULT_SLEEP_MILLISECONDS, sleep };