[Home](./index.md) > [@firebase/firestore](./firestore.md) > [/](./firestore_.md) > [UpdateData](./firestore_.updatedata.md) ## UpdateData interface Update data (for use with [updateDoc()](./firestore_lite.updatedoc.md)) consists of field paths (e.g. 'foo' or 'foo.baz') mapped to values. Fields that contain dots reference nested fields within the document. Signature: ```typescript export declare interface UpdateData ```