chore: remove unreadable blocks and use comments instead.

js/js.ast/src/org/jetbrains/kotlin/js/backend/JsToStringGenerationVisitor.java

@@ -1275,7 +1275,7 @@ public class JsToStringGenerationVisitor extends JsVisitor {
 
         sourceLocationConsumer.pushSourceInfo(null);
 
-        boolean needBraces = !x.isGlobalBlock();
+        boolean needBraces = !x.isGlobalBlock() && !x.isVirtualBlock();
         if (needBraces) {
             blockOpen();
         }

js/js.ast/src/org/jetbrains/kotlin/js/backend/ast/JsBlock.java

@@ -47,6 +47,8 @@ public class JsBlock extends SourceInfoAwareJsNode implements JsStatement {
         return false;
     }
 
+    public boolean isVirtualBlock() { return false; }
+
     @Override
     public void accept(JsVisitor v) {
         v.visitBlock(this);

js/js.ast/src/org/jetbrains/kotlin/js/backend/ast/JsVirtualBlock.kt

@@ -0,0 +1,23 @@
+// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+package org.jetbrains.kotlin.js.backend.ast;
+import org.jetbrains.kotlin.js.util.AstUtil;
+
+
+/**
+ * Represents a JavaScript block in the global scope.
+ */
+class JsVirtualBlock(statements: List<JsStatement> = emptyList()) : JsBlock(statements) {
+    override fun isVirtualBlock(): Boolean {
+        return true
+    }
+
+    override fun deepCopy(): JsVirtualBlock  {
+        val globalBlockCopy = JsVirtualBlock()
+        val statementscopy = AstUtil.deepCopy(statements);
+        globalBlockCopy.statements.addAll(statementscopy);
+        return globalBlockCopy.withMetadataFrom(this);
+    }
+}