incompatible type and expected "type[_MiddlewareClass[[]]]" [arg-type]

[RaviMintel07]

Hi ,

am using asgi-logger and extended AccessLoggerMiddleware to customise the logging in the application and when I upgrade fastapi to 0.109.x version getting issue on mypy, any suggestions ?

error: Argument 1 to "Middleware" has incompatible type "type[AccessLoggerMiddleware]"; expected "type[_MiddlewareClass[[]]]" [arg-type]

middleware = [
    Middleware(
        CORSMiddleware,
        allow_origins=["*"],
        allow_methods=["PUT", "GET", "DELETE"],
        allow_headers=["Authorization"],
    ),
    Middleware(access_logger.AccessLoggerMiddleware),
]

and this is my customise version of logging.

import structlog
from asgi_logger import middleware as asl
from asgiref.typing import ASGI3Application, HTTPScope


class AccessLoggerMiddleware(asl.AccessLoggerMiddleware):
   //code

[adriangb]

what version of mypy are you using? have you tried updating to the latest version, or using pyright which generally in my experience is more reliable?

[RaviMintel07]

I tried with mypy 1.15.0 as well but still same issue.

[adriangb]

Can you offer a self-contained MRE?