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Markdown
lang: en
title: 'API docs: extension-health.readycheck'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/strongloop/loopback-next/tree/master/extensions/health
permalink: /doc/en/lb4/apidocs.extension-health.readycheck.html
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[Home](./index.md) > [@loopback/extension-health](./extension-health.md) > [ReadyCheck](./extension-health.readycheck.md)
## ReadyCheck type
Functions for readiness check
<b>Signature:</b>
```typescript
export declare type ReadyCheck = () => Promise<void>;
```