&quot;JavaScript will never have mandatory types&quot; says Brendan Eich, who doesn&#x27;t work for Microsoft last I checked, which I mean to say Microsoft is not the driving force behind ES6.<p>Source: <a href="https:&#x2F;&#x2F;channel9.msdn.com&#x2F;Blogs&#x2F;Charles&#x2F;SPLASH-2011-Brendan-Eich-JavaScript-Today-and-Tomorrow" rel="nofollow">https:&#x2F;&#x2F;channel9.msdn.com&#x2F;Blogs&#x2F;Charles&#x2F;SPLASH-2011-Brendan-...</a>  [10:04]