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

Allow custom config for create-react-app without ejecting

// 20.1.2.3 Number.isInteger(number)
var isObject = require('./_is-object')
  , floor    = Math.floor;
module.exports = function isInteger(it){
  return !isObject(it) && isFinite(it) && floor(it) === it;
};