Typescript client not working when fastapi responses are in camelCase

[vinod-canihelp]

I have a fastapi backend. I configured it to return responses in camelCase instead of snake_case. This is how I configured it:

import pydantic
from pydantic.alias_generators import to_camel

class CustomBaseModel(pydantic.BaseModel, revalidate_instances="always", validate_assignment=True):
    class Config:
        alias_generator = to_camel
        populate_by_name = True

The backend works as expected. I tested it with both localhost:8000/docs and curl command. The responses are in camelCase.

I generated a typescript client using hey-api. The typescript response types are in camelCase. Yay!
However, the actual responses the@hey-api/client-fetch gets are in snake_case!!!
This breaks the response types. camelCase fields are undefined as the raw responses are in snake_case.

What am I missing? How do I fix it?

[vinod-canihelp]

I suspect some transformer shenanigans. Created a bug: #764