[Home](./index.md) > [@firebase/installations](./installations.md) ## installations package Firebase Installations ## Functions | Function | Description | | --- | --- | | [deleteInstallations(installations)](./installations.deleteinstallations.md) | Deletes the Firebase Installation and all associated data. | | [getId(installations)](./installations.getid.md) | Creates a Firebase Installation if there isn't one for the app and returns the Installation ID. | | [getInstallations(app)](./installations.getinstallations.md) | Returns an instance of FirebaseInstallations associated with the given FirebaseApp instance. | | [getToken(installations, forceRefresh)](./installations.gettoken.md) | Returns an Installation auth token, identifying the current Firebase Installation. | | [onIdChange(installations, callback)](./installations.onidchange.md) | Sets a new callback that will get called when Installation ID changes. Returns an unsubscribe function that will remove the callback when called. | ## Interfaces | Interface | Description | | --- | --- | | [FirebaseInstallations](./installations.firebaseinstallations.md) | Public interface of the FirebaseInstallations SDK. | ## Type Aliases | Type Alias | Description | | --- | --- | | [IdChangeCallbackFn](./installations.idchangecallbackfn.md) | An user defined callback function that gets called when Installations ID changes. | | [IdChangeUnsubscribeFn](./installations.idchangeunsubscribefn.md) | Unsubscribe a callback function previously added via . |