https://api.drupal.org/api/drupal/core%21modules%21media%21src%21MediaSourceBase.php/property/MediaSourceBase%3A%3AfieldTypeManager/9
MediaSourceBase::$fieldTypeManager | Drupal API
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https://api.drupal.org/api/drupal/core%21modules%21migrate%21tests%21src%21Unit%21destination%21EntityRevisionTest.php/property/EntityRevisionTest%3A%3AfieldTypeManager/10
EntityRevisionTest::$fieldTypeManager | Drupal API
drupalapi