/**
  * Check if the literal value is boolean true
  *
  * @return true if literal value is boolean true
  */
 public boolean isTrue() {
   return JSType.toBoolean(value);
 }
 /**
  * Fetch boolean value of node.
  *
  * @return boolean value of node.
  */
 public boolean getBoolean() {
   return JSType.toBoolean(value);
 }