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1 [forum](../README.md) / [Exports](../modules.md) / App
2
3 # Namespace: App
4
5 It's possible to tell SvelteKit how to type objects inside your app by declaring the `App` namespace. By default, a new project will have a file called `src/app.d.ts` containing the following:
6
7 ```ts
8 /// <reference types="@sveltejs/kit" />
9
10 declare namespace App {
11 interface Locals {}
12
13 interface Platform {}
14
15 interface Session {}
16
17 interface Stuff {}
18 }
19 ```
20
21 By populating these interfaces, you will gain type safety when using `event.locals`, `event.platform`, `session` and `stuff`:
22
23 ## Table of contents
24
25 ### Interfaces
26
27 - [Locals](../interfaces/App.Locals.md)
28 - [Platform](../interfaces/App.Platform.md)
29 - [Session](../interfaces/App.Session.md)
30 - [Stuff](../interfaces/App.Stuff.md)