# ChartDataStatus [Integration guide](https://docs.lumencharts.com/charting-library/reference/compatibility) · [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. Main-series data availability reported by [IChartWidgetApi.dataStatus](https://docs.lumencharts.com/charting-library/api/IChartWidgetApi#datastatus). ## state {#state} ```ts readonly state: "loading" | "ready" | "empty" | "error"; ``` Use the type signature above and the integration guide for the owning capability. ## message {#message} ```ts readonly message: string | null; ``` Plain-language reason when `state` is `error`; otherwise `null`. --- Documentation page: https://docs.lumencharts.com/charting-library/api/ChartDataStatus