Fix BasePluginConvention deprecation in KGP

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/kotlinCompilations.kt

@@ -15,7 +15,7 @@ import org.gradle.api.attributes.AttributeContainer
 import org.gradle.api.execution.TaskExecutionListener
 import org.gradle.api.file.FileCollection
 import org.gradle.api.file.SourceDirectorySet
-import org.gradle.api.plugins.BasePluginConvention
+import org.gradle.api.plugins.BasePluginExtension
 import org.gradle.api.plugins.ExtraPropertiesExtension
 import org.gradle.api.provider.Property
 import org.gradle.api.tasks.TaskProvider
@@ -370,7 +370,7 @@ internal fun addSourcesToKotlinCompileTask(
 
 private fun KotlinCompilation<*>.ownModuleName(): String {
     val project = target.project
-    val baseName = project.convention.findPlugin(BasePluginConvention::class.java)?.archivesBaseName
+    val baseName = project.extensions.getByType(BasePluginExtension::class.java).archivesName.orNull
         ?: project.name
     val suffix = if (isMain()) "" else "_$compilationName"
     return filterModuleName("$baseName$suffix")

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/pm20/KotlinCompilationTaskConfigurator.kt

@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.gradle.plugin.mpp.pm20
 
 import org.gradle.api.Project
 import org.gradle.api.tasks.TaskProvider
+import org.gradle.api.tasks.compile.AbstractCompile
 import org.jetbrains.kotlin.gradle.plugin.Kotlin2JvmSourceSetProcessor
 import org.jetbrains.kotlin.gradle.plugin.KotlinNativeTargetConfigurator
 import org.jetbrains.kotlin.gradle.plugin.mpp.addCommonSourcesToKotlinCompileTask

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/pm20/KotlinJvmVariant.kt

@@ -44,7 +44,7 @@ class KotlinJvmVariantCompilationData(val variant: KotlinJvmVariant) : KotlinVar
 
 internal fun KotlinGradleVariant.ownModuleName(): String {
     val project = containingModule.project
-    val baseName = project.convention.findPlugin(BasePluginConvention::class.java)?.archivesBaseName
+    val baseName = project.extensions.getByType(BasePluginExtension::class.java).archivesName.orNull
         ?: project.name
     val suffix = if (containingModule.moduleClassifier == null) "" else "_${containingModule.moduleClassifier}"
     return filterModuleName("$baseName$suffix")

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/pm20/KotlinMetadataCompilationData.kt

@@ -9,7 +9,7 @@ import org.gradle.api.DefaultTask
 import org.gradle.api.Project
 import org.gradle.api.file.FileCollection
 import org.gradle.api.file.SourceDirectorySet
-import org.gradle.api.plugins.BasePluginConvention
+import org.gradle.api.plugins.BasePluginExtension
 import org.gradle.api.tasks.TaskProvider
 import org.jetbrains.kotlin.gradle.dsl.KotlinCommonOptions
 import org.jetbrains.kotlin.gradle.dsl.KotlinMultiplatformCommonOptions
@@ -79,7 +79,7 @@ internal abstract class AbstractKotlinFragmentMetadataCompilationData<T : Kotlin
 
     override val moduleName: String
         get() { // FIXME deduplicate with ownModuleName
-            val baseName = project.convention.findPlugin(BasePluginConvention::class.java)?.archivesBaseName
+            val baseName = project.extensions.getByType(BasePluginExtension::class.java).archivesName.orNull
                 ?: project.name
             val suffix = if (module.moduleClassifier == null) "" else "_${module.moduleClassifier}"
             return filterModuleName("$baseName$suffix")

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/subtargets/DefaultDistribution.kt

@@ -6,7 +6,7 @@
 package org.jetbrains.kotlin.gradle.targets.js.subtargets
 
 import org.gradle.api.Project
-import org.gradle.api.plugins.BasePluginConvention
+import org.gradle.api.plugins.BasePluginExtension
 import org.jetbrains.kotlin.gradle.targets.js.dsl.Distribution
 import org.jetbrains.kotlin.gradle.utils.property
 import java.io.File
@@ -16,13 +16,11 @@ class DefaultDistribution(
     override var name: String? = null
 ) : Distribution {
 
-    private val basePluginConvention: BasePluginConvention
-        get() = project.convention.plugins["base"] as BasePluginConvention
-
     override var directory: File by property {
         project.buildDir
             .let { buildDir ->
-                name?.let { buildDir.resolve(it) } ?: buildDir.resolve(basePluginConvention.distsDirName)
+                name?.let { buildDir.resolve(it) }
+                    ?: project.extensions.getByType(BasePluginExtension::class.java).distsDirectory.asFile.get()
             }
     }
 }

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/webpack/KotlinWebpack.kt

@@ -11,7 +11,7 @@ import org.gradle.api.file.FileCollection
 import org.gradle.api.file.RegularFileProperty
 import org.gradle.api.internal.file.FileResolver
 import org.gradle.api.model.ObjectFactory
-import org.gradle.api.plugins.BasePluginConvention
+import org.gradle.api.plugins.BasePluginExtension
 import org.gradle.api.provider.Provider
 import org.gradle.api.tasks.*
 import org.gradle.deployment.internal.Deployment
@@ -106,12 +106,9 @@ constructor(
     @Input
     var saveEvaluatedConfigFile: Boolean = true
 
-    @Transient
-    private val baseConventions: BasePluginConvention? = project.convention.plugins["base"] as BasePluginConvention?
-
     @Nested
     val output: KotlinWebpackOutput = KotlinWebpackOutput(
-        library = baseConventions?.archivesBaseName,
+        library = project.extensions.getByType(BasePluginExtension::class.java).archivesName.orNull,
         libraryTarget = KotlinWebpackOutput.Target.UMD,
         globalObject = "this"
     )
@@ -125,7 +122,7 @@ constructor(
     internal var _destinationDirectory: File? = null
 
     private val defaultDestinationDirectory by lazy {
-        project.buildDir.resolve(baseConventions!!.distsDirName)
+        project.extensions.getByType(BasePluginExtension::class.java).distsDirectory.asFile.get()
     }
 
     @get:Internal
@@ -136,7 +133,7 @@ constructor(
         }
 
     private val defaultOutputFileName by lazy {
-        baseConventions?.archivesBaseName + ".js"
+        project.extensions.getByType(BasePluginExtension::class.java).archivesName.orNull + ".js"
     }
 
     @get:Internal