00typed.py

from typing import TypedDict

class ParamsDict(TypedDict):
    name: str

params : ParamsDict = {"nam": "foo"}

01param.py

from typing import TypedDict
from mypy_extensions import Expand

# https://github.com/python/mypy/issues/4441


class ParamsDict(TypedDict):
    name: str


def greet(prefix: str, *, name: str) -> None:
    print(f"{prefix}, {name}")


def hello(**params: Expand[ParamsDict]) -> None:
    greet("hello", **params)


hello(nam="foo")

02overload.py

from typing import overload, Any, TYPE_CHECKING


def greet(prefix: str, *, name: str) -> None:
    print(f"{prefix}, {name}")


@overload
def hello(*, name: str) -> None:
    ...


# suppress "Single overload definition, multiple required"
@overload
def hello(*, _: object = ...) -> None:
    ...


def hello(**params: Any) -> None:
    greet("hello", **params)


hello(name="foo")
hello(nam="x")

03plain.py

from typing import Any


def greet(prefix: str, *, name: str) -> None:
    print(f"{prefix}, {name}")


def hello(**params: Any) -> None:
    greet("hello", **params)


hello(nam="foo")

Makefile

MYPY := mypy --pretty --strict

00:
	$(MYPY) $(shell echo $@*.py)
01:
	$(MYPY) $(shell echo $@*.py)
02:
	$(MYPY) $(shell echo $@*.py)