fix pyqtSlot result parameter type and Callable generic

CHANGELOG.md

@@ -15,6 +15,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 * [#51](https://github.com/stlehmann/PyQt5-stubs/pull/51) adds `pyqtBoundSignal.signal` hinted as `str`
 
 ### Changed
+* [#102](https://github.com/stlehmann/PyQt5-stubs/pull/102) fix `pyqtSlot` parameter typing and overloads
 * [#104](https://github.com/stlehmann/PyQt5-stubs/pull/104) `sip.voidptr` handles integer values and sequences and takes `self`
 * [#103](https://github.com/stlehmann/PyQt5-stubs/pull/103) `pyqtBoundSignal.disconnect()`'s `slot` parameter is optional
 * [#100](https://github.com/stlehmann/PyQt5-stubs/pull/100) fill generic parameter as `sip.array[int]` for QtDataVisualization textures

PyQt5-stubs/QtCore.pyi

@@ -9235,7 +9235,8 @@ QT_VERSION = ... # type: int
 QT_VERSION_STR = ... # type: str
 
 
-FuncT = typing.TypeVar('FuncT', bound=typing.Callable)  # For a correct pyqtSlot annotation
+T = typing.TypeVar("T")
+FuncT = typing.Callable[..., T]
 
 
 def qSetRealNumberPrecision(precision: int) -> QTextStreamManipulator: ...
@@ -9267,7 +9268,30 @@ def oct_(s: QTextStream) -> QTextStream: ...
 def bin_(s: QTextStream) -> QTextStream: ...
 def Q_RETURN_ARG(type: typing.Any) -> QGenericReturnArgument: ...
 def Q_ARG(type: typing.Any, data: typing.Any) -> QGenericArgument: ...
-def pyqtSlot(*types: typing.Any, name: typing.Optional[str] = ..., result: typing.Optional[str] = ...) -> typing.Callable[[FuncT], FuncT]: ...
+@typing.overload
+def pyqtSlot(*types: typing.Any) -> typing.Callable[[FuncT[T]], FuncT[T]]: ...
+@typing.overload
+def pyqtSlot(*types: typing.Any, name: str) -> typing.Callable[[FuncT[T]], FuncT[T]]: ...
+@typing.overload
+def pyqtSlot(*types: typing.Any, result: typing.Type[T]) -> typing.Callable[[FuncT[T]], FuncT[T]]: ...
+@typing.overload
+def pyqtSlot(*types: typing.Any, result: str) -> typing.Callable[[FuncT[T]], FuncT[T]]: ...
+@typing.overload
+def pyqtSlot(*types: typing.Any, revision: int) -> typing.Callable[[FuncT[T]], FuncT[T]]: ...
+@typing.overload
+def pyqtSlot(*types: typing.Any, name: str, result: typing.Type[T]) -> typing.Callable[[FuncT[T]], FuncT[T]]: ...
+@typing.overload
+def pyqtSlot(*types: typing.Any, name: str, result: str) -> typing.Callable[[FuncT[T]], FuncT[T]]: ...
+@typing.overload
+def pyqtSlot(*types: typing.Any, name: str, revision: int) -> typing.Callable[[FuncT[T]], FuncT[T]]: ...
+@typing.overload
+def pyqtSlot(*types: typing.Any, result: typing.Type[T], revision: int) -> typing.Callable[[FuncT[T]], FuncT[T]]: ...
+@typing.overload
+def pyqtSlot(*types: typing.Any, result: str, revision: int) -> typing.Callable[[FuncT[T]], FuncT[T]]: ...
+@typing.overload
+def pyqtSlot(*types: typing.Any, name: str, result: typing.Type[T], revision: int) -> typing.Callable[[FuncT[T]], FuncT[T]]: ...
+@typing.overload
+def pyqtSlot(*types: typing.Any, name: str, result: str, revision: int) -> typing.Callable[[FuncT[T]], FuncT[T]]: ...
 def QT_TRANSLATE_NOOP(a0: str, a1: str) -> str: ...
 def QT_TR_NOOP_UTF8(a0: str) -> str: ...
 def QT_TR_NOOP(a0: str) -> str: ...

tests/pyqtslot.py

@@ -1,7 +1,16 @@
 from PyQt5.QtCore import pyqtSlot
 
 @pyqtSlot(str)
-def func(s: str) -> int:
+def func_none(s: str) -> None:
+    return
+
+@pyqtSlot(str, result=int)
+def func_int(s: str) -> int:
     return 42
 
-func("test")
+@pyqtSlot(str, result='int')
+def func_str(s: str) -> str:
+    return '42'
+
+func_none("test")
+x = func_int("test")  # type: int