src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/ScriptObject.java

*** 1338,1347 ****
--- 1338,1362 ----
              setPrototypeOf(Global.objectPrototype());
          }
      }
  
      /**
+      * return an array of all property keys - all inherited, non-enumerable included.
+      * This is meant for source code completion by interactive shells or editors.
+      *
+      * @return Array of keys, order of properties is undefined.
+      */
+     public String[] getAllKeys() {
+         final Set<String> keys = new HashSet<>();
+         final Set<String> nonEnumerable = new HashSet<>();
+         for (ScriptObject self = this; self != null; self = self.getProto()) {
+             keys.addAll(Arrays.asList(self.getOwnKeys(true, nonEnumerable)));
+         }
+         return keys.toArray(new String[keys.size()]);
+     }
+ 
+     /**
       * return an array of own property keys associated with the object.
       *
       * @param all True if to include non-enumerable keys.
       * @return Array of keys.
       */