/**
* Shifts the given data back to the front of the stream and will be the first bytes returned from any pending or
* subsequent read.
*
* @param string $data
*/
public function unshift(string $data)
{
if (!strlen($data)) {
return;
}
$this->buffer->unshift($data);
if (null !== $this->delayed && !$this->buffer->isEmpty()) {
$delayed = $this->delayed;
$this->delayed = null;
$delayed->resolve($this->remove());
}
}
