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z.mergeTypes

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

const { mergeTypes } = z;

type mergeTypes<A, B> = [k in keyof A | keyof B]: k extends keyof B ? B[k] : k extends keyof A ? A[k] : never;

§Type Parameters

[k in keyof A | keyof B]: k extends keyof B ? B[k] : k extends keyof A ? A[k] : never