@loopback/docs

--- lang: en title: 'API docs: metadata.decoratorfactory.mergewithinherited' 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.mergewithinherited.html ---  [Home](./index.md) > [@loopback/metadata](./metadata.md) > [DecoratorFactory](./metadata.decoratorfactory.md) > [mergeWithInherited](./metadata.decoratorfactory.mergewithinherited.md) ## DecoratorFactory.mergeWithInherited() method This method is called by the default implementation of the decorator function to merge the spec argument from the decoration with the inherited 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 inherited metadata. **Signature:** ```typescript protected mergeWithInherited(inheritedMetadata: M, target: Object, member?: string | symbol, descriptorOrIndex?: TypedPropertyDescriptor<any> | number): M; ``` ## Parameters <table><thead><tr><th> Parameter </th><th> Type </th><th> Description </th></tr></thead> <tbody><tr><td markdown="1"> inheritedMetadata </td><td markdown="1"> M </td><td markdown="1"> Metadata inherited from the base classes </td></tr> <tr><td markdown="1"> target </td><td markdown="1"> Object </td><td markdown="1"> Decoration target </td></tr> <tr><td markdown="1"> member </td><td markdown="1"> string \| symbol </td><td markdown="1"> _(Optional)_ Optional property or method </td></tr> <tr><td markdown="1"> descriptorOrIndex </td><td markdown="1"> TypedPropertyDescriptor<any> \| number </td><td markdown="1"> _(Optional)_ Optional parameter index or method descriptor </td></tr> </tbody></table> **Returns:** M