DecompiledTextFactory: add buildDecompiledTextFromJSMetadata

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/textBuilder/DecompiledTextFactory.kt

@@ -18,7 +18,12 @@ package org.jetbrains.kotlin.idea.decompiler.textBuilder
 
 import com.intellij.openapi.util.TextRange
 import com.intellij.openapi.vfs.VirtualFile
+import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.descriptors.*
+import org.jetbrains.kotlin.descriptors.impl.CompositePackageFragmentProvider
+import org.jetbrains.kotlin.descriptors.impl.ModuleDescriptorImpl
+import org.jetbrains.kotlin.idea.decompiler.navigation.JsMetaFileVirtualFileHolder
+import org.jetbrains.kotlin.js.analyze.TopDownAnalyzerFacadeForJS
 import org.jetbrains.kotlin.load.kotlin.KotlinBinaryClassCache
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.renderer.DescriptorRenderer
@@ -71,6 +76,21 @@ public fun buildDecompiledText(
     }
 }
 
+public fun buildDecompiledTextFromJsMetadata(
+        classFile: VirtualFile
+): DecompiledText {
+    val module = classFile.getUserData(JsMetaFileVirtualFileHolder.MODULE_DESCRIPTOR_KEY)
+    assert(module != null)
+
+    val packageFqName = classFile.getUserData(JsMetaFileVirtualFileHolder.PACKAGE_FQNAME_KEY)
+    assert (packageFqName != null)
+
+    val fragments = module.getPackageFragmentProvider().getPackageFragments(packageFqName)
+    val descriptors = fragments.flatMap { it.getMemberScope().getAllDescriptors() }
+
+    return buildDecompiledText(packageFqName, descriptors)
+}
+
 private val DECOMPILED_CODE_COMMENT = "/* compiled code */"
 private val DECOMPILED_COMMENT_FOR_PARAMETER = "/* = compiled code */"
 private val FLEXIBLE_TYPE_COMMENT = "/* platform type */"