luhn-generator/update/node_modules/core-js/modules/_replacer.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

module.exports = function (regExp, replace) {
  var replacer = replace === Object(replace) ? function (part) {
    return replace[part];
  } : replace;
  return function (it) {
    return String(it).replace(regExp, replacer);
  };
};