instanceof.test.ts•1.05 kB
import { expect, expectTypeOf, test } from "vitest";
import * as z from "zod/v4";
test("instanceof", async () => {
class Test {}
class Subtest extends Test {}
abstract class AbstractBar {
constructor(public val: string) {}
}
class Bar extends AbstractBar {}
const TestSchema = z.instanceof(Test);
const SubtestSchema = z.instanceof(Subtest);
const AbstractSchema = z.instanceof(AbstractBar);
const BarSchema = z.instanceof(Bar);
TestSchema.parse(new Test());
TestSchema.parse(new Subtest());
SubtestSchema.parse(new Subtest());
AbstractSchema.parse(new Bar("asdf"));
const bar = BarSchema.parse(new Bar("asdf"));
expect(bar.val).toEqual("asdf");
await expect(() => SubtestSchema.parse(new Test())).toThrow();
await expect(() => TestSchema.parse(12)).toThrow();
expectTypeOf<Test>().toEqualTypeOf<z.infer<typeof TestSchema>>();
});
test("instanceof fatal", () => {
const schema = z.instanceof(Date).refine((d) => d.toString());
const res = schema.safeParse(null);
expect(res.success).toBe(false);
});