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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)