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Documentation for LoopBack 4
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lang: en
title: 'API docs: testlab.testcallbackretval'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.testlab.testcallbackretval.html
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[Home](./index.md) > [@loopback/testlab](./testlab.md) > [TestCallbackRetval](./testlab.testcallbackretval.md)
## TestCallbackRetval type
<b>Signature:</b>
```typescript
export declare type TestCallbackRetval = void | PromiseLike<any>;
```