File: _typing_utils.py

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"""Miscellaneous utilities to aid with typing."""

from typing import Optional, TypeVar


# Helper to turn Optional[T] into T when we know None either isn't
# possible or should trigger an exception.
T = TypeVar("T")


def not_none(obj: Optional[T]) -> T:
    if obj is None:
        raise TypeError("Invariant encountered: value was None when it should not be")
    return obj