`dataclass_transform` decorator not detected when using alias

Bug Report

I came across this while trying to conditionally use typing.dataclass_transform or typing_extensions.dataclass_transforms depending on the Python version running the code.

If one defines an alias for dataclass_transform, using the alias as a decorator does not result in the expected result (mypy does not recognize the decorated class as if being decorated with dataclass_transform)

To Reproduce

Playground link: https://mypy-play.net/?mypy=latest&python=3.12&gist=c88ba0d811ade24ad47f302dfdb5b6f7

import dataclasses
import typing

dataclass_transform = typing.dataclass_transform


@dataclass_transform()
def transform(cls, /, **kwargs):
    return dataclasses.dataclass(**kwargs)


@transform
class Example:
    field: int


Example(field=1)

Expected Behavior

No error, same as if typing.dataclass_transform was being used directly

Actual Behavior
Example is not recognized as a dataclass-like class:

main.py:17: error: Unexpected keyword argument "field" for "Example"  [call-arg]

Your Environment

• Mypy version used: 1.17.1
• Mypy command-line flags: none
• Mypy configuration options from mypy.ini (and other config files): none
• Python version used: 3.12

Riproduci il report nel mypy playground collegato usando l’esempio mostrato in Python 3.12 e conferma l’errore segnalato per main.py. Traccia la gestione di dataclass_transform a partire da questa riproduzione; il lavoro è completato quando l’Example decorato con un alias non produce errori e accetta Example(field=1).