core-js/es/instance/includes.js

Standard library

var arrayIncludes = require('../array/virtual/includes');
var stringIncludes = require('../string/virtual/includes');

var ArrayPrototype = Array.prototype;
var StringPrototype = String.prototype;

module.exports = function (it) {
  var own = it.includes;
  if (it === ArrayPrototype || (it instanceof Array && own === ArrayPrototype.includes)) return arrayIncludes;
  if (typeof it === 'string' || it === StringPrototype || (it instanceof String && own === StringPrototype.includes)) {
    return stringIncludes;
  } return own;
};