(!isset($this->escaper)) {
 throw new \LogicException(\sprintf('You must call "setEnvironment()" before calling "%s()".', __METHOD__));
 }
 $this->escaper->addSafeClass($class, $strategies);
 }
 public static function escapeFilterIsSafe(Node $filterArgs)
 {
 foreach ($filterArgs as $arg) {
 if ($arg instanceof ConstantExpression) {
 return [$arg->getAttribute('value')];
 }
 return [];
 }
 return ['html'];
 }
}