file_default_scheme()
Gets the default file stream implementation.
string 'public', 'private' or any other file scheme defined as the default.
function file_default_scheme() { return \Drupal::config('system.file')->get('default_scheme'); }
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https://api.drupal.org/api/drupal/core!includes!file.inc/function/file_default_scheme/8.1.x