base/node_modules/at-least-node/index.js

module.exports = r => {
  const n = process.versions.node.split('.').map(x => parseInt(x, 10))
  r = r.split('.').map(x => parseInt(x, 10))
  return n[0] > r[0] || (n[0] === r[0] && (n[1] > r[1] || (n[1] === r[1] && n[2] >= r[2])))
}