luhn-generator/update/node_modules/@babel/runtime/helpers/isNativeFunction.js

A generator of numbers that passes the validation of Luhn algorithm or Luhn formula, also known as the 'modulus 10' or 'mod 10' algorithm

function _isNativeFunction(fn) {
  return Function.toString.call(fn).indexOf("[native code]") !== -1;
}

module.exports = _isNativeFunction;