The following program, which is given as the actual example from when `registerModule` was added (https://codereview.qt-project.org/c/qt/qtdeclarative/+/345339):
 

    QJSEngine engine;

    QJSValue num(666);
    engine.registerModule("themarkofthebeast", num);

    QString program = "import badnews from \"themarkofthebeast\";";
    QJSValue result = engine.evaluate(program);

    qDebug() << result.toString(); 

Fails to execute, producing the following output on the console:

"SyntaxError: Unexpected token `import'"

In other words, QJEngine appears to not understand "import" at all, which is weird because it's literally the example given in the patch that added registerModule to QJSEngine.

As a consequence:

• registerModule can't be used for anything
• no modules can be imported in the JS program
• it is prohibitively difficult to extend the JS with C++ code

Unless I'm making some sort of usage mistake, this seems both basic and severe, and I'm not sure how registerModule would have ever passed testing to begin with...