A PickAsserter is an ObjectAsserter for the type constructed by picking the set of properties Keys from the asserted type of the provided ObjectAsserter.

Example:

import {
  _string,
  Asserted,
  ObjectAsserter,
  PickAsserter,
} from "typeguardkit";

// types/user.ts

export const _User = new ObjectAsserter("User", {
  id: _string,
  firstName: _string,
  lastName: _string,
});

export type User = Asserted<typeof _User>;

// types/user_name.ts

export const _UserName = new PickAsserter(
  "UserName",
  _User,
  ["firstName", "lastName"],
);

export type UserName = Asserted<typeof _UserName>;