Proposal static type constraints features

[Jordan Harband]

So now for every type annotation, someone has to add `&& undefined`? That
seems like a lot of confusing boilerplate to have to add.

On Sun, Jun 3, 2018 at 10:39 PM, YU HengChun <achun.shx at qq.com> wrote:

> This is easy to solve, we change the word. But the code will be longer.
>
> The original:
>
> ```js
> function f(x) {
>   return typeof x !== 'string' || typeof x === 'undefined';
> }
> ```
>
> The proposal: typeof version
>
> ```js
> function f(x = typeof(String) && undefined ) { // Attention can not be
> omitted: && undefined
>   void typeof(Boolean); // or only: typeof(Boolean);
>   return typeof x !== 'string' || typeof x === 'undefined';
> }
> ```
>
> 这很容易解决, 换个单词就行. 但是代码会更长.
>
>
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