voluptasmollitia/docs-exp/firestore_.query.md

Monorepo for the Firebase JavaScript SDK

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

## query() function

Creates a new immutable instance of `Query` that is extended to also include additional query constraints.

<b>Signature:</b>

```typescript
export declare function query<T>(query: Query<T>, ...queryConstraints: QueryConstraint[]): Query<T>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  query | [Query](./firestore_.query.md)<!-- -->&lt;T&gt; | The Query instance to use as a base for the new constraints. |
|  queryConstraints | [QueryConstraint](./firestore_.queryconstraint.md)<!-- -->\[\] | The list of <code>QueryConstraint</code>s to apply. |

<b>Returns:</b>

[Query](./firestore_.query.md)<!-- -->&lt;T&gt;

## Exceptions

if any of the provided query constraints cannot be combined with the existing or new constraints.