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You also need to addself: AppType

Good point, thanks@adriangb! Trying it locally I realized I had to redefineAppType to be bound toFastAPI as well.

Hmm I’m surprised thebound=Starlette should work and the fact that you haveself: AppType should make the AppType always matchself which is going to be a FastAPI instance.

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I'm trying with this example:

fromcollections.abcimportAsyncGeneratorfromcontextlibimportasynccontextmanagerfromfastapiimportFastAPI@asynccontextmanagerasyncdeflifespan(_:FastAPI)->AsyncGenerator[None,None]:    ...yield    ...app=FastAPI(lifespan=lifespan)

And I get this error:

mypy sand.pyfastapi/applications.py:112: error: "AppType" has no attribute "openapi_schema"fastapi/applications.py:113: error: "AppType" has no attribute "openapi_url"fastapi/applications.py:114: error: "AppType" has no attribute "title"fastapi/applications.py:115: error: "AppType" has no attribute "version"fastapi/applications.py:126: error: "AppType" has no attribute "dependency_overrides"fastapi/applications.py:153: error: "AppType" has no attribute "setup"Found 6 errors in 1 file (checked 1 source file)

...I guess it would be fine for external things to haveAppType be bound toStarlette, but for the internals ofFastAPI it seems to be a problem. But I guess it would be fine then to have the customAppType here.

Weird, we even have a test in Starlette:https://github.com/encode/starlette/blob/8965f8849977b5752e415722a83aa00049f80ff3/tests/test_applications.py#L539-L550

Ah, yeah, the error is not in the lifespan, but that the class doesn't have the custom attributesFastAPI defines.