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

Allow custom config for create-react-app without ejecting

// 7.1.4 ToInteger
var ceil  = Math.ceil
  , floor = Math.floor;
module.exports = function(it){
  return isNaN(it = +it) ? 0 : (it > 0 ? floor : ceil)(it);
};