luhn-generator/update/node_modules/core-js-pure/internals/species-constructor.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 anObject = require('../internals/an-object');
var aFunction = require('../internals/a-function');
var wellKnownSymbol = require('../internals/well-known-symbol');

var SPECIES = wellKnownSymbol('species');

// `SpeciesConstructor` abstract operation
// https://tc39.github.io/ecma262/#sec-speciesconstructor
module.exports = function (O, defaultConstructor) {
  var C = anObject(O).constructor;
  var S;
  return C === undefined || (S = anObject(C)[SPECIES]) == undefined ? defaultConstructor : aFunction(S);
};