voluptasmollitia/docs-exp/firestore_lite.transaction.set_1.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; [Transaction](./firestore_lite.transaction.md) &gt; [set](./firestore_lite.transaction.set_1.md)

## Transaction.set() method

Writes to the document referred to by the provided [DocumentReference](./firestore_.documentreference.md)<!-- -->. If the document does not exist yet, it will be created. If you provide `merge` or `mergeFields`<!-- -->, the provided data can be merged into an existing document.

<b>Signature:</b>

```typescript
set<T>(documentRef: DocumentReference<T>, data: Partial<T>, options: SetOptions): this;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  documentRef | [DocumentReference](./firestore_lite.documentreference.md)<!-- -->&lt;T&gt; | A reference to the document to be set. |
|  data | Partial&lt;T&gt; | An object of the fields and values for the document. |
|  options | [SetOptions](./firestore_lite.setoptions.md) | An object to configure the set behavior. |

<b>Returns:</b>

this

This `Transaction` instance. Used for chaining method calls.