---
lang: en
title: 'API docs: repository.istyperesolver'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/repository
permalink: /doc/en/lb4/apidocs.repository.istyperesolver.html
---

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[Home](./index.md) &gt; [@loopback/repository](./repository.md) &gt; [isTypeResolver](./repository.istyperesolver.md)

## isTypeResolver() function

A function that checks whether a function is a TypeResolver or not.

**Signature:**

```typescript
export declare function isTypeResolver<T extends object>(fn: any): fn is TypeResolver<T>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  fn | any | The value to check. |

**Returns:**

fn is [TypeResolver](./repository.typeresolver.md)<!-- -->&lt;T&gt;


