Function fn

packages/zod/src/v4/classic/tests/custom.test.ts:19–19

(value: string)

test("instanceof", () => {
  const fn = (value: string) => Uint8Array.from(Buffer.from(value, "base64"));

  // Argument of type 'ZodCustom<Uint8Array<ArrayBuffer>, unknown>' is not assignable to parameter of type '$ZodType<any, Uint8Array<ArrayBuffer>>'.
  z.string().transform(fn).pipe(z.instanceof(Uint8Array));