WebAssembly- Explained
moduscreate.com
moduscreate.com
https://github.com/WebAssembly/design/blob/master/FAQ.md
And the section on "Will WebAssembly support View Source on the Web?".
This, of course, is more about security on the client side rather than security for the code, but given the choice, I'm far more concerned about protecting the user, even if that means my precious SPA code could get cribbed by an unscrupulous developer.