https://api.drupal.org/api/drupal/core%21modules%21aggregator%21src%21Plugin%21migrate%21source%21AggregatorFeed.php/function/AggregatorFeed%3A%3AgetIds/8.9.x
function AggregatorFeed::getIds | Drupal API
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https://api.drupal.org/api/drupal/core%21modules%21aggregator%21src%21Plugin%21migrate%21source%21AggregatorFeed.php/class/hierarchy/AggregatorFeed/8.9.x
AggregatorFeed | Drupal API
drupalapi