KotlinObjectRegisteredAsExtension

Reports Kotlin objects that are registered as plugin extensions.

Extensions lifecycle is managed by the IntelliJ Platform. Using Kotlin objects for extension registration may cause creation of unnecessary extension instances and make plugin unloading impossible.

Example

Extension registration:

<annotator language="myLang" implementationClass="com.example.MyAnnotator"/>

Extension implementation:

// bad:
object MyAnnotator : Annotator {
  ...
}

// good:
class MyAnnotator : Annotator {
  ...
}

New in 2023.1