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- from typing import Any
- __all__ = ["Undefined", "UndefinedType"]
- class UndefinedType(ValueError):
- """Auxiliary class for creating the Undefined singleton."""
- def __repr__(self) -> str:
- return "Undefined"
- __str__ = __repr__
- def __hash__(self) -> int:
- return hash(UndefinedType)
- def __bool__(self) -> bool:
- return False
- def __eq__(self, other: Any) -> bool:
- return other is Undefined
- def __ne__(self, other: Any) -> bool:
- return not self == other
- # Used to indicate undefined or invalid values (like "undefined" in JavaScript):
- Undefined = UndefinedType()
- Undefined.__doc__ = """Symbol for undefined values
- This singleton object is used to describe undefined or invalid values.
- It can be used in places where you would use ``undefined`` in GraphQL.js.
- """
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