Hot reloading support via import.meta.hot

[guybedford]

This implements the import.meta.hot API from Vite (https://vitejs.dev/guide/api-hmr.html).

The hot reloader is implemented as an extension using initialized hooks that executes before es-module-shims.

In addition this PR adds support for subgraphPassthrough: true, which effectively disables the performance feature from #208. This at least provides a way around the instancing issues which seems useful.

[abhishiv]

Hey @guybedford

Just found this PR. Are you still planning on merging it?

#380 (comment)

Thanks for sharing. There is actually a hot reload implementation for this project in #269, I just never landed it (not sure why... it works fine!). The main issue is just that it needs integration with a server that can send the reload events, but Chomp does support it as well.

If you are hesitant on merging it because of this reason, maybe I suggest instead of baking in websocket support, a function should be exposed which anyone can call in order to process these messages.

I'm interested in this, because i'm building a browser based IDE at @gratico, and hence I think a this approach is more generic and useful than making it dependent on websocket.