uniffi.toml

[bindings.swift.decorators.MyInterface]
import = "my.decorator.module"
class_name = "MyDecorator"

[bindings.swift.decorators.MyInterface.methods.catchAll]
# "{}" is replaced with the decorated function's return type.
# We'd need to do a bit of normalizing, like replacing "??" with "?".
return_type = "{}?"
# true means the decorator function throws, I think false should be the default and this could just be left out.
throws = false