src/Kernel.php
public function getCachePath(): string
    {
        if ($this->cachePath == '') {
            $this->setCachePath($this->getStoragePath() . '/cache');
        }

        return $this->cachePath;
    }
public function getCachePath(): string
    {
        if ($this->cachePath == '') {
            $this->setCachePath($this->getStoragePath() . '/cache');
        }

        return $this->cachePath;
    }
Returns app path, e.g. /var/www/storage/cache

@return string