@loopback/docs/site/apidocs/metadata.decoratorfactory._constructor_.md

Documentation files rendered at [https://loopback.io](https://loopback.io)

---
lang: en
title: 'API docs: metadata.decoratorfactory._constructor_'
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.decoratorfactory._constructor_.html
---

<!-- Do not edit this file. It is automatically generated by API Documenter. -->

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

## DecoratorFactory.(constructor)

Construct a new class decorator factory

**Signature:**

```typescript
constructor(key: string, spec: T, options?: DecoratorOptions);
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

key


</td><td markdown="1">

string


</td><td markdown="1">

Metadata key


</td></tr>
<tr><td markdown="1">

spec


</td><td markdown="1">

T


</td><td markdown="1">

Metadata object from the decorator function


</td></tr>
<tr><td markdown="1">

options


</td><td markdown="1">

[DecoratorOptions](./metadata.decoratoroptions.md)


</td><td markdown="1">

_(Optional)_ Options for the decorator. Default to `{allowInheritance: true}` if not provided


</td></tr>
</tbody></table>