Make req() return None

Author: wch

shiny/_validation.py

@@ -1,14 +1,10 @@
-from typing import TypeVar
 from .types import SilentException, SilentCancelOutputException
 
-T = TypeVar("T")
 
-
-def req(*args: T, cancel_output: bool = False) -> T:
+def req(*args: object, cancel_output: bool = False) -> None:
     for arg in args:
         if not arg:
             if cancel_output:
                 raise SilentCancelOutputException()
             else:
                 raise SilentException()
-    return args[0]