opencv.js in node throws abort(ReferenceError: document is not defined)

I want to use opencv in node. Found @techstark/opencv-js and looks promising, but I cannot run even a simple example. I've installed the examples from https://github.com/TechStark/opencv-js-examples. I'm using Node v22.18.0

My simple program:

    const { getOpenCv } = require("./opencv.js");
    
    async function main() {
      const { cv } = await getOpenCv();
      console.log("OpenCV.js is ready!");
      console.log(cv.getBuildInformation());
      const inputImage = cv.imread("Lenna.png");
      console.log("Done");
    }
    
    main();

Run with:

> npm run commonjs

Throws this error:

(build info, as expected) (a very long block of obfuscated code)

abort(ReferenceError: document is not defined). Build with -s ASSERTIONS=1 for more info. (Use node --trace-uncaught ... to show where the exception was thrown)

Node.js v22.18.0

I tried an earlier version with similar outcome. I don't know where the problem is: in techstark's package, the opencv js port (the author says it's downloaded directly from its source), an incompatibility with node.js, my own setup, or what.