zod/src/v4/mini/tests/functions.test.ts

TypeScript-first schema declaration and validation library with static type inference

import { expect, test } from "vitest";
// import * as z from "zod/v4/core";

test("z.function", () => {
  expect(true).toEqual(true);
});

// test("z.function", () => {
//   const a = z.function({
//     args: z.tuple([z.string()]),
//     returns: z.string(),
//   });

//   const myFunc = a.implement((name: string | number) => `Hello, ${name}!`);

//   expect(myFunc("world")).toEqual("Hello, world!");
//   expect(() => myFunc(123 as any)).toThrow();

//   // this won't run
//   () => {
//     // @ts-expect-error
//     const r = myFunc(123);
//     expectTypeOf(r).toEqualTypeOf<string>();
//   };
// });

// test("z.function async", async () => {
//   const b = z.function({
//     args: z.tuple([z.string()]).$check(async (_) => {}),
//     returns: z.string().$check(async (_) => {}),
//   });
//   const myFuncAsync = b.implementAsync(async (name) => `Hello, ${name}!`);

//   expect(await myFuncAsync("world")).toEqual("Hello, world!");
//   expect(myFuncAsync(123 as any)).rejects.toThrow();

//   // this won't run
//   () => {
//     // @ts-expect-error
//     const r = myFuncAsync(123);
//     expectTypeOf(r).toEqualTypeOf<Promise<string>>();
//   };
// });