Weirdness with @this

this.js

/**
 * @constructor
 */
function SomeConstructor() {
}

SomeConstructor.prototype = {
  /**
   * This one triggers the error.
   */
  someMethod: function() {
    this.foo = bar;
  },
};

(function() {

  /**
   * @constructor
   */
  function SomeOtherConstructor() {
  }

  SomeOtherConstructor.prototype = {
    /**
     * This one doesn't trigger the error.
     */
    someMethod: function() {
      this.foo = bar;
    },
  };

})();

foo(function() {

  /**
   * @constructor
   */
  function TheThirdConstructor() {
  }

  TheThirdConstructor.prototype = {
    /**
     * This one doesn't trigger the error.
     */
    someMethod: function() {
      this.foo = bar;
    },
  };

});

I assume you meant

13: (function() {

and

26: }());