core-js/modules/es6.string.includes.js

Standard library

'use strict';
var $def    = require('./$.def')
  , context = require('./$.string-context');

$def($def.P, 'String', {
  // 21.1.3.7 String.prototype.includes(searchString, position = 0)
  includes: function includes(searchString /*, position = 0 */){
    return !!~context(this, searchString, 'includes').indexOf(searchString, arguments[1]);
  }
});