---
lang: en
title: 'API docs: metadata.decoratorfactory.mergewithown'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.metadata.decoratorfactory.mergewithown.html
---

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[Home](./index.md) &gt; [@loopback/metadata](./metadata.md) &gt; [DecoratorFactory](./metadata.decoratorfactory.md) &gt; [mergeWithOwn](./metadata.decoratorfactory.mergewithown.md)

## DecoratorFactory.mergeWithOwn() method

This method is called by the default implementation of the decorator function to merge the spec argument from the decoration with the own metadata for a class, all properties, all methods, or all method parameters that are decorated by this decorator.

It MUST be overridden by subclasses to process own metadata.

<b>Signature:</b>

```typescript
protected mergeWithOwn(ownMetadata: M, target: Object, member?: string | symbol, descriptorOrIndex?: TypedPropertyDescriptor<any> | number): M;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  ownMetadata | <code>M</code> | Own Metadata exists locally on the target |
|  target | <code>Object</code> | Decoration target |
|  member | <code>string &#124; symbol</code> | Optional property or method |
|  descriptorOrIndex | <code>TypedPropertyDescriptor&lt;any&gt; &#124; number</code> | Optional parameter index or method descriptor |

<b>Returns:</b>

`M`


