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  1. Qt for Python
  2. PYSIDE-2947

Type stub for QmlElement (and others) obscure decorated type from type checkers

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    • Icon: Bug Bug
    • Resolution: Duplicate
    • Icon: Not Evaluated Not Evaluated
    • None
    • 6.8.1
    • Type hints
    • None

      The current type hints for QmlElement, QmlUncreatable, QmlAnonymous, and QmlSingleton (and possibly others) all have an argument type of `object` and a return type of `object`. This causes problems with type checkers as these should all take some type as the argument and return that same type.

      You can get seemingly correct behavior by patching `QtQml.pyi` to include, for example:

      _UncreatableT = typing.TypeVar('_UncreatableT')
def QmlUncreatable(reason: str | None = None) -> typing.Callable[[_UncreatableT], _UncreatableT]: ...

_AnonymousT = typing.TypeVar("_AnonymousT")
def QmlAnonymous(arg__1: _AnonymousT) -> _AnonymousT: ...

_ElementT = typing.TypeVar("_ElementT")
def QmlElement(arg__1: _ElementT) -> _ElementT: ...

_SingletonT = typing.TypeVar("_SingletonT")
def QmlSingleton(arg__1: _SingletonT) -> _SingletonT: ...

      There may be a cleaner way to do this, but this seems to work.

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            ctismer Christian Tismer
            jtc9242 Joel Collins
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              Resolved:

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