> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gocopper.dev/llms.txt
> Use this file to discover all available pages before exploring further.
# Vite
The `vitejs` package (from [gocopper/pkg](https://github.com/gocopper/pkg)) connects your Go templates to [Vite](https://vitejs.dev): the dev server during development, and hashed production assets in a release build. Your templates do not change between the two.
### viteAssets
The layout calls a single template function in its ``:
```html web/src/layouts/main.html theme={null}
{{ viteAssets }}
{{ template "content" . }}
```
`viteAssets` emits whatever the current mode needs, so you never write script tags by hand.
### Development Mode
With `dev_mode` enabled, `viteAssets` points the page at the Vite dev server:
```toml config/dev.toml theme={null}
[vitejs]
dev_mode = true
```
It injects the Vite client and your entrypoint as module scripts, along with the React fast-refresh preamble, so HMR works without any frontend configuration. Copper discovers your entrypoint by convention: `src/main.js`, `.ts`, `.jsx`, or `.tsx`.
### Production Mode
When `dev_mode` is off (the default), `viteAssets` reads the Vite build manifest from the assets embedded in your binary and emits the hashed `