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lang: en
title: 'API docs: boot.lifecycleobserverbooter._constructor_'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/boot
permalink: /doc/en/lb4/apidocs.boot.lifecycleobserverbooter._constructor_.html
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[Home](./index.md) > [@loopback/boot](./boot.md) > [LifeCycleObserverBooter](./boot.lifecycleobserverbooter.md) > [(constructor)](./boot.lifecycleobserverbooter._constructor_.md)
## LifeCycleObserverBooter.(constructor)
Constructs a new instance of the `LifeCycleObserverBooter` class
<b>Signature:</b>
```typescript
constructor(app: Application, projectRoot: string, observerConfig?: ArtifactOptions);
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| app | [Application](./core.application.md) | |
| projectRoot | string | |
| observerConfig | [ArtifactOptions](./boot.artifactoptions.md) | |