---
lang: en
title: 'API docs: extension-health.livecheck'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.extension-health.livecheck.html
---

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[Home](./index.md) &gt; [@loopback/extension-health](./extension-health.md) &gt; [LiveCheck](./extension-health.livecheck.md)

## LiveCheck type

Functions for liveness check

<b>Signature:</b>

```typescript
export declare type LiveCheck = () => Promise<void>;
```

