- Rename `public` -> `client` so it doesn't get copied automagically as-is (without hashes which we want for cache busting), https://vitejs.dev/guide/assets.html#the-public-directory
- We still build the version files to `public/` so their copied as-is and Vite handles it for us (so we can use `emptyOutDir`)
- Use a multiple entrypoint `.js` Vite build so things can be more intelligently bundled and take less time
- We aren't using library mode because it doesn't minify or bundle assets
- Using hash asset tags for cache busting. Hash of the file included in the file name
- We lookup these hashed assets from `manifest.json` that Vite builds (https://vitejs.dev/guide/backend-integration.html) to serve and preload
- In terms of optimized bundles, I know the current output isn't great now but will have to opt to fix that up separately in the future. Tracked by https://github.com/matrix-org/matrix-public-archive/issues/176
We already read it once for the `/health-check` endpoint and cached the response but this way we can use `getVersionTags()` everywhere without worrying about it.
Also, it's no longer `async` so we can use it in things like Express route paths and CDN asset tags more easily.
Eric Eastwood