Update Closure In Build Tools

[vaage]

Have you read the FAQ and checked for duplicate open issues?
Yes

Is your feature request related to a problem? Please describe.

This is related to the problem described in #1792 but more over, a newer version of closure will contain updated polyfills and stricter type detection/enforcement.

Describe the solution you'd like

If possible, updating to the newest stable version would be ideal. But if not possible, updating to a newer version number would provide more-than-minor benefits in terms of polyfils and type-checking.

Describe alternatives you've considered

We have regularly talked about alternative solutions for type-checking (such as using typescript) but so far they would require too many resources and would not necessarily resolve polyfill issues.

Additional context