[Home](./index.md) > [@firebase/firestore](./firestore.md) > [/](./firestore_.md) > [loadBundle](./firestore_.loadbundle.md) ## loadBundle() function Loads a Firestore bundle into the local cache. Signature: ```typescript export declare function loadBundle(firestore: FirebaseFirestore, bundleData: ReadableStream | ArrayBuffer | string): LoadBundleTask; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | firestore | [FirebaseFirestore](./firestore_.firebasefirestore.md) | The Firestore instance to load bundles for for. | | bundleData | ReadableStream<Uint8Array> \| ArrayBuffer \| string | An object representing the bundle to be loaded. Valid objects are ArrayBuffer, ReadableStream<Uint8Array> or string. | Returns: [LoadBundleTask](./firestore_.loadbundletask.md) A `LoadBundleTask` object, which notifies callers with progress updates, and completion or error events. It can be used as a `Promise`.