core-js/modules/es.array.includes.js

'use strict';
var $ = require('../internals/export');
var $includes = require('../internals/array-includes').includes;
var addToUnscopables = require('../internals/add-to-unscopables');
var arrayMethodUsesToLength = require('../internals/array-method-uses-to-length');

var USES_TO_LENGTH = arrayMethodUsesToLength('indexOf', { ACCESSORS: true, 1: 0 });

// `Array.prototype.includes` method
// https://tc39.es/ecma262/#sec-array.prototype.includes
$({ target: 'Array', proto: true, forced: !USES_TO_LENGTH }, {
  includes: function includes(el /* , fromIndex = 0 */) {
    return $includes(this, el, arguments.length > 1 ? arguments[1] : undefined);
  }
});

// https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
addToUnscopables('includes');