# Notable Changes in IntelliJ Platform and Plugins API 2021.*

> For the complete documentation index, see [llms.txt](https://plugins.jetbrains.com/docs/intellij/llms.txt).

Early Access Program (EAP) releases of upcoming versions are available [here](https://eap.jetbrains.com).

## 2021.3

### IntelliJ Platform 2021.3

External code formatter tools API
: Allows integration of standalone tools like `shfmt`: [External Code Formatter](code-formatting.html#external-code-formatter).

Simplified API for `CustomComponentAction`
: Use new method [CustomComponentAction.updateCustomComponent(Component, Presentation)](https://github.com/JetBrains/intellij-community/tree/idea/263.7307.200/platform/editor-ui-api/src/com/intellij/openapi/actionSystem/ex/CustomComponentAction.java) to synchronize given Presentation and component state.

Highlighting API exposes priority range
: Use `getPriorityRange()` in [AnnotationSession](https://github.com/JetBrains/intellij-community/tree/idea/263.7307.200/platform/analysis-api/src/com/intellij/lang/annotation/AnnotationSession.java)/[LocalInspectionToolSession](https://github.com/JetBrains/intellij-community/tree/idea/263.7307.200/platform/analysis-api/src/com/intellij/codeInspection/LocalInspectionToolSession.java) to optimize highlighting for coarse-grained files (e.g., `PsiPlainTextFile` files with single node).

## 2021.2

### IntelliJ Platform 2021.2

Unit test mode: non-production `IconManager`
: Now `com.intellij.ui.IconManager.createDeferredIcon()` doesn't use `iconProducer` which might result in "wrong" composite icons and failed assertions. Override `UsefulTestCase.isIconRequired()` returning `true` to restore production icons. Alternatively, invoke `Registry.get("psi.deferIconLoading").setValue(false)` in `setUp()` and `Registry.get("psi.deferIconLoading").resetToDefault()` in `tearDown()`.

Constructor Injection disabled for Extensions
: Please obtain necessary components only when needed (logged as ERROR now).

Language Injection
: Use [LanguageInjectionContributor](https://github.com/JetBrains/intellij-community/tree/idea/263.7307.200/platform/core-api/src/com/intellij/lang/injection/general/LanguageInjectionContributor.java) ([com.intellij.languageInjectionContributor](https://jb.gg/ipe?extensions=com.intellij.languageInjectionContributor) extension point ) and [LanguageInjectionPerformer](https://github.com/JetBrains/intellij-community/tree/idea/263.7307.200/platform/core-api/src/com/intellij/lang/injection/general/LanguageInjectionPerformer.java) ([com.intellij.languageInjectionPerformer](https://jb.gg/ipe?extensions=com.intellij.languageInjectionPerformer) extension point ) to customize [language injection](language-injection.html#languageinjectioncontributor-and-languageinjectionperformer).

### IntelliJ IDEA 2021.2

Unbundled plugins
: Several plugins (Arquillian, AspectJ, CoffeeScript, Debugger Support for JSP (JSR45), Drools, Guice, Helidon, Java EE: Enterprise Java Beans (EJB), Spring OSGi, Spring Web Flow) have been unbundled. The IDE will suggest installation if the project contains related framework dependency. If a plugin depends on them, users will need to install them from the [JetBrains Marketplace](https://plugins.jetbrains.com).

## 2021.1

### IntelliJ Platform 2021.1

Add unambiguous imports on the fly for custom languages
: Override [ReferenceImporter#isAddUnambiguousImportsOnTheFlyEnabled()](https://github.com/JetBrains/intellij-community/tree/idea/263.7307.200/platform/analysis-impl/src/com/intellij/codeInsight/daemon/ReferenceImporter.java) and provide corresponding user setting. Implement `HintAction` with `fixSilently()` and hook it up to highlighting as a quick fix for unresolved reference.

Ability to override encoding per `VirtualFile`
: Implement [FileEncodingProvider](https://github.com/JetBrains/intellij-community/tree/idea/263.7307.200/platform/core-api/src/com/intellij/openapi/vfs/encoding/FileEncodingProvider.java) and register in [com.intellij.fileEncodingProvider](https://jb.gg/ipe?extensions=com.intellij.fileEncodingProvider) extension point .

[JCEF](embedded-browser-jcef.html): wrapper for `CefBrowser`
: [JBCefOsrHandlerBrowser](https://github.com/JetBrains/intellij-community/tree/idea/263.7307.200/platform/ui.jcef/jcef/JBCefOsrHandlerBrowser.java) forwards to custom `CefRenderHandler`, e.g., for off-screen rendering.

### Java Plugin 2021.1

Testframework: JUnit4 variant for `LightJavaCodeInsightFixtureTestCase`
: Use [LightJavaCodeInsightFixtureTestCase4](https://github.com/JetBrains/intellij-community/tree/idea/263.7307.200/java/testFramework/src/com/intellij/testFramework/fixtures/LightJavaCodeInsightFixtureTestCase4.kt).