Type definition bug: ModelOfType maps HeatChart to never, so createModel cannot infer HeatChartModel

DanRussell — Wed, 29 Apr 2026 18:13:21 GMT

@ArcGIS/charts-components@5.0.18

The TypeScript type mapping for `ModelOfType<T>` excludes heat charts by mapping `ModelTypes.HeatChart` to `never`.
Because `createModel` returns `Promise<ModelOfType<T>>`, this causes incorrect typing for heat chart creation even though heat charts are supported and created at runtime.

import { createModel, ModelTypes } from "@arcgis/charts-components"; import FeatureLayer from "@arcgis/core/layers/FeatureLayer"; const layer = new FeatureLayer({ url: "..." }); const model = await createModel({ chartType: ModelTypes.HeatChart, layer }); // Expected: model inferred as BarChartModel | LineChartModel | ComboBarLineChartModel | BoxPlotModel | PieChartModel | ScatterplotModel | HistogramModel | GaugeModel | RadarChartModel | HeatChartModel // Actual: model inferred as BarChartModel | LineChartModel | ComboBarLineChartModel | BoxPlotModel | PieChartModel | ScatterplotModel | HistogramModel | GaugeModel | RadarChartModel

Impact

- Incorrect IntelliSense and type narrowing for heat chart workflows.
- Forces consumer-side assertions/workarounds for otherwise valid API usage.

Re: Type definition bug: ModelOfType maps HeatChart to never, so createModel cannot infer HeatChartModel

DanRussell — Thu, 30 Apr 2026 16:04:12 GMT

Additionally, HeatChartModel is not included here: @ArcGIS\charts-components\dist\model\index.d.ts

Re: Type definition bug: ModelOfType maps HeatChart to never, so createModel cannot infer HeatChartModel

HaoyanChen — Thu, 30 Apr 2026 17:35:08 GMT

Hi @DanRussell, thanks for letting us know about the typing issue here. We have looked into the issue and will be fixing for the upcoming release (version 5.1).

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Type definition bug: ModelOfType maps HeatChart to never, so createModel cannot infer HeatChartModel

Re: Type definition bug: ModelOfType maps HeatChart to never, so createModel cannot infer HeatChartModel

Re: Type definition bug: ModelOfType maps HeatChart to never, so createModel cannot infer HeatChartModel