Jade\Compiler\AttributesCompiler::getValueCode PHP Метод

    protected function getValueCode($escaped, $value, &$valueCheck)
    {
        if ($this->keepNullAttributes) {
            return $this->escapeIfNeeded($escaped, $value);
        }
        $valueCheck = $value;
        return $this->escapeIfNeeded($escaped, '$__value');
    }