Nuxt/docs/content/3.api/3.utils/update-app-config.md

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# `updateAppConfig`
Updates [app config](/guide/directory-structure/app.config) using deep assignment. Existing (nested) properties will be preserved.
**Usage:**
```js
const appConfig = useAppConfig() // { foo: 'bar' }
const newAppConfig = { foo: 'baz' }
updateAppConfig(newAppConfig)
console.log(appConfig) // { foo: 'baz' }
```
::ReadMore{link="/guide/directory-structure/app.config"}