I only had time to take a very quick look, but that looks awesome!
For me on the SPA module I think I would add a couple of .md files just to explain that it is done one way here but could be done with anything one would like (react, angular, ionic, web-components, stencil, vanilla js, typescript, etc.), that jQuery is available upon request but not needed or provided unless requested, a couple of little things like that, that can potentially evolve. But love the samples so far. I'll give those a test hopefully by the end of this weekend

I only had time to take a very quick look, but that looks awesome! For me on the SPA module ...

I am somewhat torn on the SPA module. I've spent a couple of hours making it look a bit better than before. This module has a reason to be here and a reason not to be. The reason it should be here is that it shows how far you can take this whole HTML templating stuff. The reason, IMHO, it shouldn't be here is that I don't wish to create the impression how you should use this module pattern. Instead I'd much rather promote a SPA module with a React frontend as that is the way most web UI developers see frontend development. But yeah ... framework wars incoming.