Merge pull request #208 from gabrieldonadel/fix/agp9-built-in-kotlin

fix(android): skip explicit Kotlin plugin when AGP registers the kotlin extension

Author: retyui

android/build.gradle

@@ -23,7 +23,13 @@ if (project == rootProject) {
 }
 
 apply plugin: "com.android.library"
-apply plugin: "kotlin-android"
+// AGP 9 ships built-in Kotlin support and registers the `kotlin` extension
+// itself. Applying the Kotlin plugin on top of it fails configuration with
+// "Cannot add extension with name 'kotlin'". Only apply it when nothing has
+// registered that extension yet.
+if (project.extensions.findByName('kotlin') == null) {
+  apply plugin: "kotlin-android"
+}
 
 if (isNewArchitectureEnabled()) {
   apply plugin: "com.facebook.react"