StackFormation\ValueResolver\Stage\StackOutput::invoke PHP Method

    public function invoke($string)
    {
        $string = preg_replace_callback('/\\{output:([^:\\}\\{]+?):([^:\\}\\{]+?)\\}/', function ($matches) {
            $this->valueResolver->getDependencyTracker()->trackStackDependency('output', $matches[1], $matches[2], $this->sourceBlueprint, $this->sourceType, $this->sourceKey);
            return $this->getStackFactory()->getStackOutput($matches[1], $matches[2]);
        }, $string);
        return $string;
    }