Support empty chains for "signMessage-only" use cases

[pepoospina]

I want users to be able to connect to thier wallet from my app, but only for signing data. No need to read or write to any network.

It would be cool if I could use wagmi-react + one of the wallet connectors (e.g. web3modal) to connect to the wallet without forcing the app and the user to be aware of any chain, provider, publicClient, etc.

It seems not to be supported, as it asks for the chains config to be a non-empty array.

WDYT?