PEP-655 introduced the Required and NotRequired type hints for TypedDicts, this can be used as a simplification in the *Required type hints like.

Example:

class InputAlertRequired(TypedDict):
    title: str
    description: str

class InputAlert(InputAlertRequired, total=False):
    tags: list[str]

can be simplified into a single object like:

class InputAlert(TypedDict, total=False):
    title: Required[str]
    description: Required[str]
    tags: list[str]

or alternatively:

class InputAlert(TypedDict):
    title: str
    description: str
    tags: NotRequired[list[str]]

However these new type hints are not supported by older python versions so it makes sense to introduce typing_extensions as a dependency to the project to retrofit the typehints to older versions.