improvement: expose system object in swagger-ui-react's onComplete callback (via #5221)

* expose swagger object so it can be controlled in the onComplete function

* docs: swagger-ui-react onComplete system argument

flavors/swagger-ui-react/README.md

@@ -45,8 +45,12 @@ Remote URL to an OpenAPI document that Swagger UI will fetch, parse, and display
 
 #### `onComplete`: PropTypes.func
 
+> `(system) => void`
+
 A callback function that is triggered when Swagger-UI finishes rendering an OpenAPI document.
 
+Swagger UI's `system` object is passed as an argument.
+
 #### `requestInterceptor`: PropTypes.func
 
 > `req => req` or `req => Promise<req>`.

flavors/swagger-ui-react/index.js

@@ -66,7 +66,7 @@ export default class SwaggerUI extends React.Component {
 
   onComplete = () => {
     if (typeof this.props.onComplete === "function") {
-      return this.props.onComplete()
+      return this.props.onComplete(this.system)
     }
   }
 }