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[Home](./index.md) > [@firebase/storage](./storage.md) > [StorageObserver](./storage.storageobserver.md)
## StorageObserver interface
A stream observer for Firebase Storage.
<b>Signature:</b>
```typescript
export interface StorageObserver<T>
```
## Properties
| Property | Type | Description |
| --- | --- | --- |
| [complete?](./storage.storageobserver.complete.md) | CompleteFn \| null | <i>(Optional)</i> |
| [error?](./storage.storageobserver.error.md) | (error: [FirebaseStorageError](./storage.firebasestorageerror.md)<!-- -->) => void \| null | <i>(Optional)</i> |
| [next?](./storage.storageobserver.next.md) | NextFn<T> \| null | <i>(Optional)</i> |