index.js

import cron from 'cron-parser';

export const main = () => {
  const x = cron.parseExpression('*/2 * * * *');
  console.log(x);
}

package.json

{
  "name": "intl-problem",
  "version": "0.1.0",
  "type": "module",
  "dependencies": {
    "cron-parser": "^4.9.0"
  },
  "devDependencies": {
    "@endo/cli": "^1.0.3"
  }
}