---
url: /api/kiln/browser/type-aliases/MainFn.md
---
[Kiln API](../../../index.md) / [kiln/browser](../index.md) / MainFn

# Type Alias: MainFn

```ts
type MainFn = () => 
  | App
| Promise<App>;
```

## Returns

| [`App`](../../classes/App.md)
| `Promise`<[`App`](../../classes/App.md)>