* @throws InvalidResourceException If there is being set
* an invalid file resource
*/
- function writeToFile ($dataStream);
+ function writeToFile (string $dataStream);
/**
* Writes at given position by seeking to it.
* @param $data Data to be written
* @return mixed Number of writes bytes or false on error
*/
- function writeAtPosition ($seedPosition, $data);
+ function writeAtPosition (int $seedPosition, string $data);
}