extractorOf.js

const onUnknown = key => new Proxy({}, {
  get(target, name) {
    switch (name) {
      case 'or':
        Console.debug(`unknown key [${key}]`);
        return initial => initial;
      default:
        return onUnknown(key);
    }
  },
});

const extractorOf = underlying => {
  return new Proxy(underlying, {
    get: (target, name) => {
      if (!(name in target)) {
        return onUnknown(name);
      }
      switch (typeof target[name]) {
        case 'function':
          return target[name];
        case 'object':
          return extractorOf(target[name]);
        default:
          return extractorOf({ or: () => target[name] });
      }
    },
  });
};

export default extractorOf;