memory.js

var MemoryStorage, e,
  extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
  hasProp = {}.hasOwnProperty;

MemoryStorage = (function(superClass) {
  extend(MemoryStorage, superClass);

  function MemoryStorage() {
    this.db = {};
  }

  MemoryStorage.prototype.getItem = function(key) {
    if (this.db.hasOwnProperty(key)) {
      return this.db[key];
    } else {
      return void 0;
    }
  };

  MemoryStorage.prototype.setItem = function(key, value) {
    this.db[key] = value;
    return true;
  };

  MemoryStorage.prototype.clear = function() {
    return this.db = {};
  };

  MemoryStorage.prototype.removeItem = function(key) {
    delete this.db[key];
  };

  return MemoryStorage;

})(Storage);

Object.defineProperty(MemoryStorage.prototype, "length", {
  get: function() {
    return Object.keys(this.db).length;
  }
});

window.MemoryStorage = MemoryStorage;

try {
  window.localStorage.setItem("enabled", "true");
  window.localStorage.removeItem("enabled");
  window.pubgStorage = window.localStorage;
} catch (error) {
  e = error;
  window.pubgStorage = new MemoryStorage();
}

// then you can just use `window.pubgStorage` for everything