* @return $streamData The compressed stream data
* @throws InvalidArgumentException If the stream is not compressable or decompressable
*/
- public function compressStream ($streamData) {
+ public function compressStream (string $streamData) {
// Validate parameter
if (is_object($streamData) || is_resource($streamData)) {
// Throw an exception
* @return $streamData The decompressed stream data
* @throws InvalidArgumentException If the stream is not compressable or decompressable
*/
- public function decompressStream ($streamData) {
+ public function decompressStream (string $streamData) {
// Validate parameter
if (is_object($streamData) || is_resource($streamData)) {
// Throw an exception