this.__extends in wrapper-function

[vasa-c]

The code

class A {}

class B extends A {}

Compiled to

var __extends = this.__extends || function (d, b) {
    // ...
};

var A = (function () {
    // ...
})();

var B = (function (_super) {
    // ...
})(A);

Often resulting files can be handled in a specific way.
For example, CommonJS module:

"use strict";

define("moduleName", function (exports, require, module) {
    var __extends = this.__extends || function (d, b) {
        // ...
    };
    var A = (function () {
        // ...
    })();    
    // ...
});

In the strict mode this inside functions is NULL.
this.__extends leads to cannot read property __extends of undefined.

My solution: __extends = (this && this.__extends) || function.
Or delete this.__extends completely (why do we need it?).

[RyanCavanaugh]

Please see #1622 (specifically rbuckton's comment at the bottom)