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using_kotlin.md: note FileType as notable exception for using 'object'

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Yann Cébron 2023-10-31 16:16:47 +01:00
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topics/tutorials/using_kotlin.md
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@ -172,6 +172,8 @@ When registering an extension, the platform uses a dependency injection framewor
For this reason, plugins *must not* use [Kotlin objects](https://kotlinlang.org/docs/object-declarations.html#object-declarations-overview) (`object` keyword) to implement any <path>[plugin.xml](plugin_configuration_file.md)</path> declarations. For this reason, plugins *must not* use [Kotlin objects](https://kotlinlang.org/docs/object-declarations.html#object-declarations-overview) (`object` keyword) to implement any <path>[plugin.xml](plugin_configuration_file.md)</path> declarations.
Managing the lifecycle of extensions is the platform responsibility and instantiating these classes as Kotlin singletons may cause issues. Managing the lifecycle of extensions is the platform responsibility and instantiating these classes as Kotlin singletons may cause issues.
A notable exception is `com.intellij.openapi.fileTypes.FileType` (`com.intellij.fileType` extension point), see also the inspection descriptions below.
Problems are highlighted via these inspections (2023.2): Problems are highlighted via these inspections (2023.2):
- <control>Plugin DevKit | Code | Kotlin object registered as extension</control> for Kotlin code - <control>Plugin DevKit | Code | Kotlin object registered as extension</control> for Kotlin code
- <control>Plugin DevKit | Plugin descriptor | Extension class is a Kotlin object</control> for <path>plugin.xml</path> - <control>Plugin DevKit | Plugin descriptor | Extension class is a Kotlin object</control> for <path>plugin.xml</path>