https://api.drupal.org/api/drupal/core%21modules%21file%21src%21Plugin%21Field%21FieldFormatter%21FilemimeFormatter.php/function/FilemimeFormatter%3A%3AviewValue/11.x
function FilemimeFormatter::viewValue | Drupal API
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https://api.drupal.org/api/drupal/core%21modules%21file%21src%21Plugin%21Field%21FieldFormatter%21FileExtensionFormatter.php/function/FileExtensionFormatter%3A%3AviewValue/9
function FileExtensionFormatter::viewValue | Drupal API
functiondrupalapi