can more explain why we need `typechain` in here?

[howardpen9]

can more explain why we need typechain in here?

[amanusk]

E.g. To correctly type check function calls made from tests, according to the available ABI.
Also makes it easier for the language server (ts-server) to complete the correct function + params.
If this could be achieved without additional dependencies I'd be happy to know :)