voluptasmollitia/docs-exp/firestore_lite.usefirestoreemulator.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/firestore](./firestore.md) &gt; [lite](./firestore_lite.md) &gt; [useFirestoreEmulator](./firestore_lite.usefirestoreemulator.md)

## useFirestoreEmulator() function

Modify this instance to communicate with the Cloud Firestore emulator.

Note: This must be called before this instance has been used to do any operations.

<b>Signature:</b>

```typescript
export declare function useFirestoreEmulator(firestore: FirebaseFirestore, host: string, port: number): void;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  firestore | [FirebaseFirestore](./firestore_lite.firebasefirestore.md) | The Firestore instance to configure to connect to the emulator. |
|  host | string | the emulator host (ex: localhost). |
|  port | number | the emulator port (ex: 9000). |

<b>Returns:</b>

void