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

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

// FF99+ bug
var BROKEN_ON_SPARSE = fails(function () {
  // eslint-disable-next-line es/no-array-prototype-includes -- detection
  return !Array(1).includes();
});

// `Array.prototype.includes` method
// https://tc39.es/ecma262/#sec-array.prototype.includes
$({ target: 'Array', proto: true, forced: BROKEN_ON_SPARSE }, {
  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');