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

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[Home](./index.md) &gt; [@loopback/core](./core.md) &gt; [isLifeCycleObserver](./core.islifecycleobserver.md)

## isLifeCycleObserver() function

Test if an object implements LifeCycleObserver

<b>Signature:</b>

```typescript
export declare function isLifeCycleObserver(obj: object): obj is LifeCycleObserver;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  obj | object | An object |

<b>Returns:</b>

obj is [LifeCycleObserver](./core.lifecycleobserver.md)