Help me understand how to make a resolver

[AskAlice]

I'm hoping to make a resolver for some variables that may or may not be in a package.json in the current directory

Is this possible with a resolver? At the moment I do this after taking in the flags, and overriding them, but I've not seen a good example of the usage of a resolver (I've seen the implementation example) but it's kind of hard for me to understand how they could apply.

[alecthomas]

Definitely. Take a look at https://github.com/alecthomas/kong-hcl and https://github.com/alecthomas/kong-yaml for examples. But if that doesn't suffice feel free to continue discussing in here.