voluptasmollitia/docs-exp/firestore_.loadbundletask.then.md

Monorepo for the Firebase JavaScript SDK

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

## LoadBundleTask.then() method

Implements the `Promise<LoadBundleTaskProgress>.then` interface.

<b>Signature:</b>

```typescript
then<T, R>(onFulfilled?: (a: LoadBundleTaskProgress) => T | PromiseLike<T>, onRejected?: (a: Error) => R | PromiseLike<R>): Promise<T | R>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  onFulfilled | (a: [LoadBundleTaskProgress](./firestore_.loadbundletaskprogress.md)<!-- -->) =&gt; T \| PromiseLike&lt;T&gt; | Called on the completion of the loading task with a final <code>LoadBundleTaskProgress</code> update. The update will always have its <code>taskState</code> set to <code>&quot;Success&quot;</code>. |
|  onRejected | (a: Error) =&gt; R \| PromiseLike&lt;R&gt; | Called when an error occurs during bundle loading. |

<b>Returns:</b>

Promise&lt;T \| R&gt;