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    Suggestion 
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    Resolution: Unresolved
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    P3: Somewhat important 
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    5.15.5, 6.1.1
Currently we can use qmlRegisterSingletonType() to register a QML file as singleton type in a module, but it doesn't work for a JS file and just crash.
I also tried QJSEngine::importModule() and QJSEngine::evaluate() as replacement, but both of them don't work when CONFIG+=qtquickcompiler