Mat's default constructor issue

[NoxFly]

NodeJs v16.17.1
npm v8.19.2

OS: Ubuntu 22.04

On a new empty project.
OpenCV previously installed.

import cv from '@anpanman/opencv_ts';
import { PNG } from 'pngjs';

const mat = new cv.Mat();

Results in :

TypeError: opencv_ts_1.default.Mat is not a constructor

Also, trying to get the webcam's mat. How to get it ? No docs. default opencv code would be

const webcam = new cv.VideoCapture(0);
const frame = new cv.Mat();
webcam.read(frame);
// ...

But VideoCapture does not exists.