[Gradle, JS] Add types into public package json

^KT-40753 fixed

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/npm/PackageJson.kt

@@ -33,6 +33,8 @@ class PackageJson(
 
     var resolutions: Map<String, String>? = null
 
+    var types: String? = null
+
     @Suppress("USELESS_ELVIS")
     val devDependencies = mutableMapOf<String, String>()
         get() = field ?: mutableMapOf()

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/npm/PublicPackageJsonTask.kt

@@ -11,6 +11,8 @@ import org.gradle.api.tasks.Nested
 import org.gradle.api.tasks.OutputFile
 import org.gradle.api.tasks.TaskAction
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinJsCompilation
+import org.jetbrains.kotlin.gradle.targets.js.ir.GENERATE_D_TS
+import org.jetbrains.kotlin.gradle.targets.js.ir.KotlinJsIrCompilation
 import org.jetbrains.kotlin.gradle.targets.js.npm.NpmProject.Companion.PACKAGE_JSON
 import org.jetbrains.kotlin.gradle.utils.property
 import java.io.File
@@ -53,7 +55,14 @@ constructor(
 
     @TaskAction
     fun resolve() {
+        val compilation = npmProject.compilation
+
         packageJson(npmProject, realExternalDependencies).let { packageJson ->
+            packageJson.main = "${npmProject.name}.js"
+
+            if (compilation is KotlinJsIrCompilation) {
+                packageJson.types = "${npmProject.name}.d.ts"
+            }
 
             packageJson.apply {
                 listOf(