Note that this doesn't include the Closure Compiler[0], and
doesn't affect Clojurescript[1], which has traditionally used the compiler and related bits of the Google Closure library.
When we eventually remove the direct GCL dependency it will sadly be more for optics than anything else.
Google is heavily invested in TypeScript and JavaScript. Closure Compiler is far from half dead but the need to support current language features is mitigated by translating front ends (like TypeScript).
It will support these features eventually. Public field support is mostly there, just not on by default.