<!-- Public documentation export; not library implementation source. -->
# IExternalDatafeed

[Integration guide](https://docs.lumencharts.com/charting-library/datafeed/) · [Reference index](https://docs.lumencharts.com/charting-library/api/)

Public contract reference. This declaration describes types and callback shapes; availability is constrained by the linked integration guide and the runtime capability. Legacy product-specific fields are not a promise of implementation.

## onReady {#onready}

```ts
onReady(callback: OnReadyCallback): void;
```

Use the type signature above and the integration guide for the owning capability.

| Parameter | Type | Required |
| --- | --- | --- |
| `callback` | `OnReadyCallback` | Yes |

## Related types

- [OnReadyCallback](https://docs.lumencharts.com/charting-library/api/OnReadyCallback)

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Documentation page: https://docs.lumencharts.com/charting-library/api/IExternalDatafeed