By now (March 2021) there is a dedicated pandas stub project in progress. It is however not developed by the pandas team (thanks to @remeus for pointing that out). The data-science-types project is deprecated. On GitHub they write:
⚠️ this project has mostly stopped development ⚠️
The pandas team and the numpy team are both in the process of integrating type stubs into their codebases, and we don’t see the point of competing with them.
The NumPy stubs used to be in a separate project, but now have been merged into the main git repo:
These stubs have been merged into NumPy, and all further development will happen in the NumPy main repo. We welcome your contributions there!
In July 2022, the pandas-stubs package will be integrated into the pandas GitHub project http://github.com/pandas-dev/pandas-stubs. They write:
Starting from July 2022 pandas_stubs package will no longer be sourced from here but instead from a repository owned and maintained by the core pandas team