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title: 'API docs: metadata.decoratorfactory._constructor_'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
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editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/metadata
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[Home](./index.md) > [@loopback/metadata](./metadata.md) > [DecoratorFactory](./metadata.decoratorfactory.md) > [(constructor)](./metadata.decoratorfactory._constructor_.md)
## DecoratorFactory.(constructor)
Construct a new class decorator factory
<b>Signature:</b>
```typescript
constructor(key: string, spec: T, options?: DecoratorOptions);
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| key | string | Metadata key |
| spec | T | Metadata object from the decorator function |
| options | [DecoratorOptions](./metadata.decoratoroptions.md) | Options for the decorator. Default to <code>{allowInheritance: true}</code> if not provided |