https://www.graalvm.org/ 
public abstract class com.oracle.truffle.js.builtins.ConsoleBuiltins$JSConsoleGroupNode extends com.oracle.truffle.js.builtins.ConsoleBuiltins$JSConsoleOperation
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: com.oracle.truffle.js.builtins.ConsoleBuiltins$JSConsoleGroupNode
  super_class: com.oracle.truffle.js.builtins.ConsoleBuiltins$JSConsoleOperation
{
  private com.oracle.truffle.js.builtins.GlobalBuiltins$JSGlobalPrintNode printNode;
    descriptor: Lcom/oracle/truffle/js/builtins/GlobalBuiltins$JSGlobalPrintNode;
    flags: (0x0002) ACC_PRIVATE
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.nodes.Node$Child()

  private com.oracle.truffle.js.nodes.cast.JSToStringNode toStringNode;
    descriptor: Lcom/oracle/truffle/js/nodes/cast/JSToStringNode;
    flags: (0x0002) ACC_PRIVATE
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.nodes.Node$Child()

  public void <init>(com.oracle.truffle.js.runtime.JSContext, com.oracle.truffle.js.nodes.function.JSBuiltin);
    descriptor: (Lcom/oracle/truffle/js/runtime/JSContext;Lcom/oracle/truffle/js/nodes/function/JSBuiltin;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // com.oracle.truffle.js.builtins.ConsoleBuiltins$JSConsoleGroupNode this
         0: .line 49
            new java.lang.Error
            dup
            ldc "Unresolved compilation problems: \n\tThe import com.oracle.truffle.js.builtins.ConsoleBuiltinsFactory cannot be resolved\n\tThe import com.oracle.truffle.js.builtins.ConsoleBuiltinsFactory cannot be resolved\n\tThe import com.oracle.truffle.js.builtins.ConsoleBuiltinsFactory cannot be resolved\n\tThe import com.oracle.truffle.js.builtins.ConsoleBuiltinsFactory cannot be resolved\n\tThe import com.oracle.truffle.js.builtins.ConsoleBuiltinsFactory cannot be resolved\n\tThe import com.oracle.truffle.js.builtins.ConsoleBuiltinsFactory cannot be resolved\n\tThe import com.oracle.truffle.js.builtins.ConsoleBuiltinsFactory cannot be resolved\n\tThe import com.oracle.truffle.js.builtins.ConsoleBuiltinsFactory cannot be resolved\n\tThe import com.oracle.truffle.js.builtins.ConsoleBuiltinsFactory cannot be resolved\n\tThe import com.oracle.truffle.js.builtins.GlobalBuiltinsFactory cannot be resolved\n\tJSGlobalPrintNodeGen cannot be resolved\n\tJSGlobalPrintNodeGen cannot be resolved\n\tJSConsoleAssertNodeGen cannot be resolved\n\tJSConsoleClearNodeGen cannot be resolved\n\tJSConsoleCountNodeGen cannot be resolved\n\tJSConsoleCountResetNodeGen cannot be resolved\n\tJSConsoleGroupNodeGen cannot be resolved\n\tJSConsoleGroupEndNodeGen cannot be resolved\n\tJSConsoleTimeNodeGen cannot be resolved\n\tJSConsoleTimeEndNodeGen cannot be resolved\n\tJSConsoleTimeLogNodeGen cannot be resolved\n\tJSGlobalPrintNodeGen cannot be resolved\n\tJSGlobalPrintNodeGen cannot be resolved\n\tJSGlobalPrintNodeGen cannot be resolved\n\tJSGlobalPrintNodeGen cannot be resolved\n"
            invokespecial java.lang.Error.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // com.oracle.truffle.js.builtins.ConsoleBuiltins$JSConsoleGroupNode this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/builtins/ConsoleBuiltins$JSConsoleGroupNode;
    MethodParameters:
         Name  Flags
      context  
      builtin  

  protected com.oracle.truffle.api.object.DynamicObject group(java.lang.Object[]);
    descriptor: ([Ljava/lang/Object;)Lcom/oracle/truffle/api/object/DynamicObject;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.builtins.ConsoleBuiltins$JSConsoleGroupNode this
        start local 1 // java.lang.Object[] label
         0: .line 266
            aload 1 /* label */
            arraylength
            ifle 2
         1: .line 267
            aload 0 /* this */
            getfield com.oracle.truffle.js.builtins.ConsoleBuiltins$JSConsoleGroupNode.printNode:Lcom/oracle/truffle/js/builtins/GlobalBuiltins$JSGlobalPrintNode;
            aload 1 /* label */
            invokevirtual com.oracle.truffle.js.builtins.GlobalBuiltins$JSGlobalPrintNode.executeObjectArray:([Ljava/lang/Object;)Ljava/lang/Object;
            pop
         2: .line 269
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            invokevirtual com.oracle.truffle.js.builtins.ConsoleBuiltins$JSConsoleGroupNode.getConsoleUtil:()Lcom/oracle/truffle/js/runtime/JSConsoleUtil;
            invokevirtual com.oracle.truffle.js.runtime.JSConsoleUtil.incConsoleIndentation:()V
         3: .line 270
            getstatic com.oracle.truffle.js.runtime.objects.Undefined.instance:Lcom/oracle/truffle/js/runtime/objects/JSDynamicObject;
            areturn
        end local 1 // java.lang.Object[] label
        end local 0 // com.oracle.truffle.js.builtins.ConsoleBuiltins$JSConsoleGroupNode this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    4     0   this  Lcom/oracle/truffle/js/builtins/ConsoleBuiltins$JSConsoleGroupNode;
            0    4     1  label  [Ljava/lang/Object;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.Specialization()
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
       Name  Flags
      label  
}
SourceFile: "ConsoleBuiltins.java"
NestHost: com.oracle.truffle.js.builtins.ConsoleBuiltins
InnerClasses:
  public abstract TruffleBoundary = com.oracle.truffle.api.CompilerDirectives$TruffleBoundary of com.oracle.truffle.api.CompilerDirectives
  public abstract Child = com.oracle.truffle.api.nodes.Node$Child of com.oracle.truffle.api.nodes.Node
  public abstract JSConsoleGroupNode = com.oracle.truffle.js.builtins.ConsoleBuiltins$JSConsoleGroupNode of com.oracle.truffle.js.builtins.ConsoleBuiltins
  public abstract JSConsoleOperation = com.oracle.truffle.js.builtins.ConsoleBuiltins$JSConsoleOperation of com.oracle.truffle.js.builtins.ConsoleBuiltins
  public abstract JSGlobalPrintNode = com.oracle.truffle.js.builtins.GlobalBuiltins$JSGlobalPrintNode of com.oracle.truffle.js.builtins.GlobalBuiltins