FastAPI integration

Inject services into async endpoints using Annotated[..., Inject()].

class EmailService:
    pass


class UserService:
    def __init__(self, email_service: EmailService) -> None:
        self.email_service = email_service

    async def create_user(self) -> None:
        pass


app = FastAPI()

@app.post("/users")
async def create_user(user_service: Annotated[UserService, Inject()]) -> None:
    await user_service.create_user()

services = ServiceCollection()
services.add_transient(EmailService)
services.add_transient(UserService)
services.configure_fastapi(app)