src/Javascript/RuleParser.php
protected function isConditionalRule($attribute, $rule)
    {
        return isset($this->conditional[$attribute]) &&
        in_array($rule, $this->conditional[$attribute]);
    }
protected function isConditionalRule($attribute, $rule)
    {
        return isset($this->conditional[$attribute]) &&
        in_array($rule, $this->conditional[$attribute]);
    }
Determine if rule is passed with sometimes.

@param mixed $attribute
@param string $rule
@return bool