Typescript type mismatch between LagrangePolynomialApproximation and InterpolationAlgorithm

[jfayot]

What happened?

When configuring interpolation on a SampledPositionProperty in typetcript, passing the exported LagrangePolynomialApproximation object as interpolationAlgorithm produces a type error:

error TS2739: Type 'typeof LagrangePolynomialApproximation' is missing the following properties from type 'InterpolationAlgorithm': type, interpolate

The API documentation indicates that LagrangePolynomialApproximation is a valid interpolation algorithm, and the code works at runtime. However, its exported typescript type is not assignable to the InterpolationAlgorithm type expected by setInterpolationOptions

This is also applicable to LinearApproximation and HermitePolynomialApproximation

Reproduction steps

import {
  LagrangePolynomialApproximation,
  SampledPositionProperty,
} from "cesium";

const sampledPos = new SampledPositionProperty();

sampledPos.setInterpolationOptions({
  interpolationAlgorithm: LagrangePolynomialApproximation,
  interpolationDegree: 2,
});

Sandcastle example

No response

Environment

Browser: Chrome 150.0.7871.128
CesiumJS Version: 1.143
Operating System: macos Tahoe 26.5.2

AI acknowledgment

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