@loopback/docs

--- lang: en title: 'API docs: openapi-v3.oasenhancerservice' keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI sidebar: lb4_sidebar editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/openapi-v3 permalink: /doc/en/lb4/apidocs.openapi-v3.oasenhancerservice.html ---  [Home](./index.md) > [@loopback/openapi-v3](./openapi-v3.md) > [OASEnhancerService](./openapi-v3.oasenhancerservice.md) ## OASEnhancerService class An extension point for OpenAPI Spec enhancement This service is used for enhancing an OpenAPI spec by loading and applying one or more registered enhancers. A typical use of it would be generating the OpenAPI spec for the endpoints on a server in the `@loopback/rest` module. **Signature:** ```typescript export declare class OASEnhancerService ``` ## Constructors <table><thead><tr><th> Constructor </th><th> Modifiers </th><th> Description </th></tr></thead> <tbody><tr><td markdown="1"> [(constructor)(getEnhancers, options)](./openapi-v3.oasenhancerservice._constructor_.md) </td><td markdown="1"> </td><td markdown="1"> Constructs a new instance of the `OASEnhancerService` class </td></tr> </tbody></table> ## Properties <table><thead><tr><th> Property </th><th> Modifiers </th><th> Type </th><th> Description </th></tr></thead> <tbody><tr><td markdown="1"> [options?](./openapi-v3.oasenhancerservice.options.md) </td><td markdown="1"> `readonly` </td><td markdown="1"> [OASEnhancerServiceOptions](./openapi-v3.oasenhancerserviceoptions.md) \| undefined </td><td markdown="1"> _(Optional)_ An extension point should be able to receive its options via dependency injection. </td></tr> <tr><td markdown="1"> [spec](./openapi-v3.oasenhancerservice.spec.md) </td><td markdown="1"> </td><td markdown="1"> [OpenApiSpec](./openapi-v3.openapispec.md) </td><td markdown="1"> Getter for `_spec` </td></tr> </tbody></table> ## Methods <table><thead><tr><th> Method </th><th> Modifiers </th><th> Description </th></tr></thead> <tbody><tr><td markdown="1"> [applyAllEnhancers(options)](./openapi-v3.oasenhancerservice.applyallenhancers.md) </td><td markdown="1"> </td><td markdown="1"> Generate OpenAPI spec by applying ALL registered enhancers TBD: load enhancers by group names </td></tr> <tr><td markdown="1"> [applyEnhancerByName(name)](./openapi-v3.oasenhancerservice.applyenhancerbyname.md) </td><td markdown="1"> </td><td markdown="1"> Apply a given enhancer's merge function. Return the latest \_spec. </td></tr> <tr><td markdown="1"> [getEnhancerByName(name)](./openapi-v3.oasenhancerservice.getenhancerbyname.md) </td><td markdown="1"> </td><td markdown="1"> Find an enhancer by its name </td></tr> </tbody></table>