mypy/test-data/unit/check-dataclass-transform.test at 8207a9ffaf73d1e8a7f164b09dfac4d61625b687 · wesleywright/mypy · GitHub

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[case testDataclassTransformReusesDataclassLogic]
# flags: --python-version 3.7
from typing import dataclass_transform, Type

@dataclass_transform()
def my_dataclass(cls: Type) -> Type:
    return cls

@my_dataclass
class Person:
    name: str
    age: int

    def summary(self):
        return "%s is %d years old." % (self.name, self.age)

reveal_type(Person)  # N: Revealed type is "def (name: builtins.str, age: builtins.int) -> __main__.Person"
Person('John', 32)
Person('Jonh', 21, None)  # E: Too many arguments for "Person"

[typing fixtures/typing-medium.pyi]
[builtins fixtures/dataclasses.pyi]

[case testDataclassTransformIsFoundInTypingExtensions]
# flags: --python-version 3.7
from typing import Type
from typing_extensions import dataclass_transform

@dataclass_transform()
def my_dataclass(cls: Type) -> Type:
    return cls

@my_dataclass
class Person:
    name: str
    age: int

    def summary(self):
        return "%s is %d years old." % (self.name, self.age)

reveal_type(Person)  # N: Revealed type is "def (name: builtins.str, age: builtins.int) -> __main__.Person"
Person('John', 32)
Person('Jonh', 21, None)  # E: Too many arguments for "Person"

[typing fixtures/typing-full.pyi]
[builtins fixtures/dataclasses.pyi]