This PR is a Work In Progress that addresses multiple `__extends`
being output as described in #1350: Multiple `__extends` being output
when `--module amd` is set.
The issue still exists as of `v1.5.0 - f53e6a8`.
Apparently a fix was created for this in #1356 but according to #2009, a
[comment](https://github.com/Microsoft/TypeScript/issues/2009#issuecomment-74136291)
later indicated that this was never merged in.
Further conversation continued in #2487 but did not yield any result. I
refer to my earlier recommendation in #1350.
> My question is this, would the TypeScript team be open to a flag that
> can be passed to tsc that will generate something like the following
> ```ts
> define(["require", "exports", "__extends", './mammal'], function (require, exports, __extends, Mammal) {
> var Human = (function (_super) {
> __extends(Human, _super);
> function Human() {
> _super.apply(this, arguments);
> }
> return Human;
> })(Mammal);
> return Human;
> });
> ```
To continue with the naming convention I have chosen the flag
`--noEmitHelpers`.