---
lang: en
title: 'API docs: repository.isinvalidpolymorphismerror'
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.isinvalidpolymorphismerror.html
---

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[Home](./index.md) &gt; [@loopback/repository](./repository.md) &gt; [isInvalidPolymorphismError](./repository.isinvalidpolymorphismerror.md)

## isInvalidPolymorphismError() function

**Signature:**

```typescript
export declare function isInvalidPolymorphismError(e: any): e is InvalidPolymorphismError<any>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  e | any |  |

**Returns:**

e is [InvalidPolymorphismError](./repository.invalidpolymorphismerror.md)<!-- -->&lt;any&gt;