import { type OptionalPredicate } from "https://deno.land/x/silicon@v1.0.0/deps.ts";
definition: Predicate<T | undefined> & { optional: true; }
x/silicon/deps.ts>OptionalPredicate
import { type OptionalPredicate } from "https://deno.land/x/silicon@v1.0.0/deps.ts";