https://www.graalvm.org/ 
public interface com.oracle.js.parser.ir.BreakableNode extends com.oracle.js.parser.ir.LexicalContextNode
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.js.parser.ir.BreakableNode
  super_class: java.lang.Object
{
  public abstract boolean isBreakableWithoutLabel();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "BreakableNode.java"