custom.test.ts•1.22 kB
import { expect, test } from "vitest";
import * as z from "zod/v4";
test("passing validations", () => {
const example1 = z.custom<number>((x) => typeof x === "number");
example1.parse(1234);
expect(() => example1.parse({})).toThrow();
});
test("string params", () => {
const example1 = z.custom<number>((x) => typeof x !== "number", "customerr");
const result = example1.safeParse(1234);
expect(result.success).toEqual(false);
expect(JSON.stringify(result.error).includes("customerr")).toEqual(true);
});
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));
});
test("non-continuable by default", () => {
const A = z
.custom<string>((val) => typeof val === "string")
.transform((_) => {
throw new Error("Invalid input");
});
expect(A.safeParse(123).error!).toMatchInlineSnapshot(`
[ZodError: [
{
"code": "custom",
"path": [],
"message": "Invalid input"
}
]]
`);
});