Webmozart\Assert\Assert::writable PHP Method

    public static function writable($value, $message = '')
    {
        if (!is_writable($value)) {
            static::reportInvalidArgument(sprintf($message ?: 'The path %s is not writable.', static::valueToString($value)));
        }
    }

 /**
  * @param string $taskrc
  * @param string $taskData
  * @param array $rcOptions
  * @param string $bin
  * @throws TaskwarriorException
  */
 public function __construct($taskrc = '~/.taskrc', $taskData = '~/.task', $rcOptions = [], $bin = 'task')
 {
     $this->bin = Path::canonicalize($bin);
     $this->taskrc = Path::canonicalize($taskrc);
     $this->taskData = Path::canonicalize($taskData);
     $this->rcOptions = array_merge(array('rc:' . $this->taskrc, 'rc.data.location=' . $this->taskData, 'rc.json.array=true', 'rc.json.depends.array=true', 'rc.confirmation=no'), $rcOptions);
     if (version_compare($this->version(), '2.5.0') < 0) {
         throw new TaskwarriorException(sprintf("Taskwarrior version %s isn't supported", $this->version()));
     }
     try {
         Assert::readable($this->taskrc);
         Assert::readable($this->taskData);
         Assert::writable($this->taskData);
     } catch (\InvalidArgumentException $e) {
         throw new TaskwarriorException($e->getMessage(), $e->getCode(), $e);
     }
 }