luhn-generator/update/node_modules/core-js-pure/es/instance/flags.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

var flags = require('../regexp/flags');

var RegExpPrototype = RegExp.prototype;

module.exports = function (it) {
  return (it === RegExpPrototype || it instanceof RegExp) && !('flags' in it) ? flags(it) : it.flags;
};