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Documentation for LoopBack 4
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lang: en
title: 'API docs: repository.uniontype.(constructor)'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.repository.uniontype.(constructor).html
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[Home](./index.md) > [@loopback/repository](./repository.md) > [UnionType](./repository.uniontype.md) > [(constructor)](./repository.uniontype.(constructor).md)
## UnionType.(constructor)
Constructs a new instance of the `UnionType` class
<b>Signature:</b>
```typescript
constructor(itemTypes: Type<any>[]);
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| itemTypes | <code>Type<any>[]</code> | |