Reference

type Validator<T> = (x, file) => asserts x is T;

type WhichConfig = "user" | "project";

function find(
   which, 
   cwd, 
   home): string

function load<T>(
   field, 
   validator, 
   which): undefined | T

function reload(field, which): unknown

function save(
   field, 
   value, 
   which): void

function unload(which): void