@loopback/docs/site/apidocs/core.islifecycleobserver.md

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---
lang: en
title: 'API docs: core.islifecycleobserver'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/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

**Signature:**

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

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

obj


</td><td markdown="1">

object


</td><td markdown="1">

An object


</td></tr>
</tbody></table>

**Returns:**

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