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wxt/docs/guide/essentials/config/runtime.md
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# Runtime Config
> This API is still a WIP, with more features coming soon!
Define runtime configuration in a single place, `<srcDir>/app.config.ts`:
```ts
import { defineAppConfig } from 'wxt/sandbox';
// Define types for your config
declare module 'wxt/sandbox' {
export interface WxtAppConfig {
theme?: 'light' | 'dark';
}
}
export default defineAppConfig({
theme: 'dark',
});
```
:::warning
This file is committed to the repo, so don't put any secrets here. Instead, use [Environment Variables](#environment-variables)
:::
To access runtime config, WXT provides the `useAppConfig` function:
```ts
import { useAppConfig } from 'wxt/sandbox';
console.log(useAppConfig()); // { theme: "dark" }
```
## Environment Variables in App Config
You can use environment variables in the `app.config.ts` file.
```ts
declare module 'wxt/sandbox' {
export interface WxtAppConfig {
apiKey?: string;
skipWelcome: boolean;
}
}
export default defineAppConfig({
apiKey: import.meta.env.VITE_API_KEY,
skipWelcome: import.meta.env.VITE_SKIP_WELCOME === 'true',
});
```
This has several advantages:
- Define all expected environment variables in a single file
- Convert strings to other types, like booleans or arrays
- Provide default values if an environment variable is not provided