# Build Version Display Pattern Notes

This file keeps examples. The normative rules live in `contract.md`.

## Frontend (JS/TS build tools)

```ts
// vite.config.ts / webpack.config.js
define: {
  __APP_VERSION__: JSON.stringify(process.env.APP_VERSION ?? "dev"),
}

// Footer component
<footer>v{__APP_VERSION__}</footer>
```

## Go (server-rendered HTML)

```go
// main.go
var Version = "dev"

// Build: go build -ldflags "-X main.Version=1.4.2"
```

```html
<!-- base template -->
<footer>v{{ .Version }}</footer>
```