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+[forum](../README.md) / [Exports](../modules.md) / App
+
+# Namespace: App
+
+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:
+
+```ts
+/// <reference types="@sveltejs/kit" />
+
+declare namespace App {
+	interface Locals {}
+
+	interface Platform {}
+
+	interface Session {}
+
+	interface Stuff {}
+}
+```
+
+By populating these interfaces, you will gain type safety when using `event.locals`, `event.platform`, `session` and `stuff`:
+
+## Table of contents
+
+### Interfaces
+
+- [Locals](../interfaces/App.Locals.md)
+- [Platform](../interfaces/App.Platform.md)
+- [Session](../interfaces/App.Session.md)
+- [Stuff](../interfaces/App.Stuff.md)