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Documentation for LoopBack 4
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lang: en
title: 'API docs: rest.operationretval'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.rest.operationretval.html
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[Home](./index.md) > [@loopback/rest](./rest.md) > [OperationRetval](./rest.operationretval.md)
## OperationRetval type
Return value of a controller method (a function implementing an operation). This is a type alias for "any", used to distinguish operation results from other "any" typed values.
<b>Signature:</b>
```typescript
export declare type OperationRetval = any;
```