Funnily enough, almost none of that applies to Google. 1 - there is very little third-party JS at Google due to historical issues interoperating with the Closu

Funnily enough, almost none of that applies to Google. 1 - there is very little third-party JS at Google due to historical issues interoperating with the Closure compiler, as documented in the post. 2 - Strict type checking is used and continually made stricter. 3 - Yes, when you have thousands of engineers contributing to the same code base for some quite sophisticated web applications, type checking is extremely useful.