src/Composer/Downloader/DownloadManager.php
public function setOutputProgress($outputProgress)
    {
        foreach ($this->downloaders as $downloader) {
            $downloader->setOutputProgress($outputProgress);
        }

        return $this;
    }
public function setOutputProgress($outputProgress)
    {
        foreach ($this->downloaders as $downloader) {
            $downloader->setOutputProgress($outputProgress);
        }

        return $this;
    }
Sets whether to output download progress information for all registered
downloaders

@param  bool            $outputProgress
@return DownloadManager