[Home](./index.md) > [@firebase/firestore](./firestore.md) > [lite](./firestore_lite.md) > [query](./firestore_lite.query.md) ## query() function Creates a new immutable instance of `Query` that is extended to also include additional query constraints. Signature: ```typescript export declare function query(query: Query, ...queryConstraints: QueryConstraint[]): Query; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | query | [Query](./firestore_lite.query.md)<T> | The Query instance to use as a base for the new constraints. | | queryConstraints | [QueryConstraint](./firestore_lite.queryconstraint.md)\[\] | The list of QueryConstraints to apply. | Returns: [Query](./firestore_lite.query.md)<T> ## Exceptions if any of the provided query constraints cannot be combined with the existing or new constraints.