Docker build opencv.js cannot work as expected

I followed the guide to build the opencv.js with docker, but opencv.js cannot work. It’s some environment or info below:

  1. The source code is 41a2eb5245583403f4a26ca24ec7ba736d2cca5e of the master branch,
  2. System: macos big sur 11.5.2
  3. The build command: docker run --rm -v $(pwd):/src -u $(id -u):$(id -g) emscripten/emsdk:2.0.10 emcmake python3 ./platforms/js/ build_js
  4. I use the opencv.js of build_js/bin/opencv.js to test the script examples.js below
// Define a global variable 'Module' with a method 'onRuntimeInitialized':
Module = {
  onRuntimeInitialized() {
    // this is our application:
// Load 'opencv.js' assigning the value to the global variable 'cv'
cv = require('./opencv.js')
  1. run command node examples.js but there is no output info

then I use the opencv.js of this one to run the examples.js, it works.

I don’t have any ideas about that. Pls give me some advices. Thanks.