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Documentation for LoopBack 4
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lang: en
title: 'API docs: openapi-spec-builder.anoperationspec'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.openapi-spec-builder.anoperationspec.html
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[Home](./index.md) > [@loopback/openapi-spec-builder](./openapi-spec-builder.md) > [anOperationSpec](./openapi-spec-builder.anoperationspec.md)
## anOperationSpec() function
Create a new instance of OperationSpecBuilder.
<b>Signature:</b>
```typescript
export declare function anOperationSpec(): OperationSpecBuilder;
```
<b>Returns:</b>
`OperationSpecBuilder`