A type predicated by Predicate.

import { is, type PredicateType } from "@core/unknownutil";

const isPerson = is.ObjectOf({
  name: is.String,
  age: is.Number,
  address: is.OptionalOf(is.String),
});

type Person = PredicateType<typeof isPerson>;
// Above is equivalent to the following type
// type Person = {
//   name: string;
//   age: number;
//   address: string | undefined;
// };