# getChunkRunId

# Function: getChunkRunId()

```ts
function getChunkRunId(chunk): string | undefined;
```

Defined in: [packages/ai/src/utilities/chunk-ids.ts:9](https://github.com/TanStack/ai/blob/main/packages/ai/src/utilities/chunk-ids.ts#L9)

Run id on the spec event, or `metadata.tanstack.runId` after normalize.

## Parameters

### chunk

[`AGUIEvent`](../type-aliases/AGUIEvent.md)

## Returns

`string` \| `undefined`