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z.BRAND

import { z } from "https://esm.sh/zod@3.25.76/index.d.cts"; 

const { BRAND } = z;

const BRAND: unique symbol;

type BRAND<T extends string | number | symbol> = {

[BRAND]: [k in T]: true;

};

§Type Parameters

T extends string | number | symbol

{

[BRAND]: [k in T]: true;

}