refactor: validate parameters and the returns of functions #640
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Imports additions to validate the types of functions' parameters and its returns using mypy:
Line 4: from typing import List, Callable, TypeVar, cast, Any
Line 5: from typing import NoReturn
Initialize the generic type to use with decorators:
Line 8: F = TypeVar('F', bound=Callable[..., Any])
Other changes:
Line 11: add the "NoReturn" for the function warn_missing_module()
Lines 30 and 41: add the return type as F (generic type)
Lines 55 and 57: add the cast to using decorators with wrappers (see in https://mypy.readthedocs.io/en/stable/generics.html#declaring-decorators)