.vscode/settings.recommended.json contains recommended settings for VSCode. Copy to .vscode/settings.json to use these settings.
./zed/settings.recommended.json contains recommended settings for Zed. Copy to .zed/settings.json to use these settings.
If you use rust-analyzer in your editor you will want to enable the ffi_uniffi when working on the functions to be used over the FFI. Otherwise rust-analyzer will see all the code behind that feature as dead code since it is disable by default. You could also enable ffi_wasm, but it is generally easier to work with the UniFFI feature enabled instead. This is done in the above recommended VSCode and Zed settings.