Function callback

packages/zod/src/v3/tests/base.test.ts:23–25

(predicate: (val: string) => boolean)

test("test this binding", () => {
  const callback = (predicate: (val: string) => boolean) => {
    return predicate("hello");
  };

  expect(callback((value) => z.string().safeParse(value).success)).toBe(true); // true
  expect(callback((value) => z.string().safeParse(value).success)).toBe(true); // true