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lang: en
title: 'API docs: metadata.designtimemethodmetadata.parametertypes'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/metadata
permalink: /doc/en/lb4/apidocs.metadata.designtimemethodmetadata.parametertypes.html
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[Home](./index.md) > [@loopback/metadata](./metadata.md) > [DesignTimeMethodMetadata](./metadata.designtimemethodmetadata.md) > [parameterTypes](./metadata.designtimemethodmetadata.parametertypes.md)
## DesignTimeMethodMetadata.parameterTypes property
An array of parameter types.
<b>Signature:</b>
```typescript
parameterTypes: Function[];
```