veritatisdoloremque/docs-exp/firestore_.transaction.update.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/firestore](./firestore.md) &gt; [/](./firestore_.md) &gt; [Transaction](./firestore_.transaction.md) &gt; [update](./firestore_.transaction.update.md)

## Transaction.update() method

<b>Signature:</b>

```typescript
update(documentRef: DocumentReference<unknown>, data: UpdateData): this;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  documentRef | [DocumentReference](./firestore_.documentreference.md)<!-- -->&lt;unknown&gt; |  |
|  data | [UpdateData](./firestore_.updatedata.md) |  |

<b>Returns:</b>

this