public EntityTypeInterface::hasLinkTemplate($key)
Indicates if a link template exists for a given key.
string $key: The link type.
bool TRUE if the link template exists, FALSE otherwise.
public function hasLinkTemplate($key);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!EntityTypeInterface.php/function/EntityTypeInterface::hasLinkTemplate/8.1.x