---
title: "instanceof_"
source: "https://github.com/remix-run/remix/blob/8905f3943706e1f53696ab83e70a84873cabfc90/packages/data-schema/src/lib/schema.ts#L562"
---

# instanceof_

## Summary

Create a schema that validates a value is an instance of a class.

## Signature

```ts
function instanceof_<constructor extends (args: any[]) => any>(
  constructor: constructor,
): Schema<unknown, InstanceType<constructor>>

```

## Returns

A schema that produces the instance type