babel-preset-test-bundled-dependencies/node_modules/core-js/modules/_is-array-iter.js

Allow custom config for create-react-app without ejecting

// check on default Array iterator
var Iterators  = require('./_iterators')
  , ITERATOR   = require('./_wks')('iterator')
  , ArrayProto = Array.prototype;

module.exports = function(it){
  return it !== undefined && (Iterators.Array === it || ArrayProto[ITERATOR] === it);
};