h54s/src/ie_polyfills.js

module.exports = function() {
  if (!Object.create) {
    Object.create = function(proto, props) {
      if (typeof props !== "undefined") {
        throw "The multiple-argument version of Object.create is not provided by this browser and cannot be shimmed.";
      }
      function ctor() { }
      ctor.prototype = proto;
      return new ctor();
    };
  }


  // From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys
  if (!Object.keys) {
    Object.keys = (function () {
      'use strict';
      var hasOwnProperty = Object.prototype.hasOwnProperty,
          hasDontEnumBug = !({toString: null}).propertyIsEnumerable('toString'),
          dontEnums = [
            'toString',
            'toLocaleString',
            'valueOf',
            'hasOwnProperty',
            'isPrototypeOf',
            'propertyIsEnumerable',
            'constructor'
          ],
          dontEnumsLength = dontEnums.length;

      return function (obj) {
        if (typeof obj !== 'object' && (typeof obj !== 'function' || obj === null)) {
          throw new TypeError('Object.keys called on non-object');
        }

        var result = [], prop, i;

        for (prop in obj) {
          if (hasOwnProperty.call(obj, prop)) {
            result.push(prop);
          }
        }

        if (hasDontEnumBug) {
          for (i = 0; i < dontEnumsLength; i++) {
            if (hasOwnProperty.call(obj, dontEnums[i])) {
              result.push(dontEnums[i]);
            }
          }
        }
        return result;
      };
    }());
  }

  // From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/lastIndexOf
  if (!Array.prototype.lastIndexOf) {
    Array.prototype.lastIndexOf = function(searchElement /*, fromIndex*/) {
      'use strict';

      if (this === void 0 || this === null) {
        throw new TypeError();
      }

      var n, k,
        t = Object(this),
        len = t.length >>> 0;
      if (len === 0) {
        return -1;
      }

      n = len - 1;
      if (arguments.length > 1) {
        n = Number(arguments[1]);
        if (n != n) {
          n = 0;
        }
        else if (n !== 0 && n != (1 / 0) && n != -(1 / 0)) {
          n = (n > 0 || -1) * Math.floor(Math.abs(n));
        }
      }

      for (k = n >= 0 ? Math.min(n, len - 1) : len - Math.abs(n); k >= 0; k--) {
        if (k in t && t[k] === searchElement) {
          return k;
        }
      }
      return -1;
    };
  }
}();

if (window.NodeList && !NodeList.prototype.forEach) {
   NodeList.prototype.forEach = Array.prototype.forEach;
}