voluptasmollitia/docs-exp/installations.idchangecallbackfn.md

Monorepo for the Firebase JavaScript SDK

<!-- Do not edit this file. It is automatically generated by API Documenter. -->

[Home](./index.md) &gt; [@firebase/installations](./installations.md) &gt; [IdChangeCallbackFn](./installations.idchangecallbackfn.md)

## IdChangeCallbackFn type

An user defined callback function that gets called when Installations ID changes.

<b>Signature:</b>

```typescript
export declare type IdChangeCallbackFn = (installationId: string) => void;
```