> Is the QJSEngine a complete replacement of QScriptEngine ?

No, not complete. QJSEngine provides less APIs and less control of the script 
execution and context arrangement. Whether your application is portable depends 
on which features of QtScriptEngine you use.

Do you:
- swap out the global object,
- push/pop contexts,
- use QScriptClass
- throw script exceptions in constructors of script classes defined in C++
- use variable argument lengths in method calls from JS to C++?

then porting will not be straight forward. Otherwise it should be. Either 
evaluate your scripts directly with QJSEngine::evaluate() or use QQmlExpression 
if you need context hierarchies.

> Can I use the Qt QML module-contained QJSEngine for a classical
> QWidgets-based
> program ? If so, is the JS programming in this setting very different than
> what
> I am used to with Qt Script ?

Yes, you can use the QML/JS engine in any context, even without a GUI. QtQuick 
is just a bunch of components written in QML that you don't need to use at all.
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