https://www.graalvm.org/ 
public interface com.oracle.truffle.js.runtime.PromiseHook
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.truffle.js.runtime.PromiseHook
  super_class: java.lang.Object
{
  public static final int TYPE_INIT;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 0

  public static final int TYPE_RESOLVE;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  public static final int TYPE_BEFORE;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 2

  public static final int TYPE_AFTER;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 3

  public abstract void promiseChanged(int, com.oracle.truffle.api.object.DynamicObject, com.oracle.truffle.api.object.DynamicObject);
    descriptor: (ILcom/oracle/truffle/api/object/DynamicObject;Lcom/oracle/truffle/api/object/DynamicObject;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
               Name  Flags
      changeType     
      promise        
      parentPromise  
}
SourceFile: "PromiseHook.java"