dataclasses-json: [BUG] #411 introduced even worse side effect than it fixed.

Description

https://github.com/lidatong/dataclasses-json/pull/411 try to fix the pylance cannot resolve to_json(), etc.

However, this breaks all auto-completion of dataclass_json decorated classes.

I think 99% use cases, we need the IDE to treat the decorated class as dataclass instead of DataClassJsonMixin. Because we all know what kind of method it adds. Thus # type: ignore is totally acceptable.

Moreover, the to_json kind of method is used far less frequent that the dataclass __init__ and its other methods.

I think we should prioritize the IDE support from dataclass itself than the DataClassJsonMixin.

Expected type expression but received "((cls: Unknown) -> type[DataClassJsonMixin]) | type[DataClassJsonMixin]"
  "(cls: Unknown) -> type[DataClassJsonMixin]" is not a class

Expected no arguments to "DataClassJsonMixin" constructor

Can we please revert that change till we found a better solution about that?

The thing is the returned class should be a sub class of both original cls and the DataClassjsonMixin, not just the ABC class.

Code snippet that reproduces the issue

from dataclasses import dataclass
from dataclasses_json import dataclass_json, DataClassJsonMixin
from typing import List

@dataclass_json
@dataclass
class Person:
    x: List[int]

def test(a: Person):
    pass

p = Person([1,])

Describe the results you expected

pylance should now show error and should auto-complete the Person class.

Python version you are using

Python 3.10.6

Environment description

dataclasses-json==0.5.9 marshmallow==3.19.0 marshmallow-enum==1.5.1 mypy-extensions==1.0.0 packaging==23.1 typing-inspect==0.9.0 typing_extensions==4.7.1