---
title: "undefined_"
source: "https://github.com/remix-run/remix/blob/8905f3943706e1f53696ab83e70a84873cabfc90/packages/data-schema/src/lib/schema.ts#L1039"
---

# undefined_

## Summary

Create a schema that accepts `undefined`.

## Signature

```ts
function undefined_(): Schema<unknown, undefined>

```

## Returns

A schema that produces `undefined`