How to use CylindricalWarper in opencv.js?

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import * as cv from "opencv.js";

...

let warper = new cv.PyRotationWarper('cylindrical', focals);

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It failed with the following error message:

-> TypeError: opencv_js__WEBPACK_IMPORTED_MODULE_0__.PyRotationWarper is not a constructor

Any experts who know the way to use CylindricalWarper in opencv.js ?

Thanks in advance.