PluginInterface

class \Composer\Installers\Plugin implements \Composer\Plugin\PluginInterface
class \Drupal\Composer\Plugin\ProjectMessage\MessagePlugin implements \Composer\Plugin\PluginInterface, \Composer\EventDispatcher\EventSubscriberInterface
class \Drupal\Composer\Plugin\Scaffold\Plugin implements \Composer\Plugin\PluginInterface, \Composer\EventDispatcher\EventSubscriberInterface, \Composer\Plugin\Capable
class \Drupal\Composer\Plugin\VendorHardening\VendorHardeningPlugin implements \Composer\Plugin\PluginInterface, \Composer\EventDispatcher\EventSubscriberInterface
class \Http\Discovery\Composer\Plugin implements \Composer\Plugin\PluginInterface, \Composer\EventDispatcher\EventSubscriberInterface
class \Nevay\SPI\Composer\Plugin implements \Composer\Plugin\PluginInterface, \Composer\EventDispatcher\EventSubscriberInterface
class \PHPCSStandards\Composer\Plugin\Installers\PHPCodeSniffer\Plugin implements \Composer\Plugin\PluginInterface, \Composer\EventDispatcher\EventSubscriberInterface
class \PHPStan\ExtensionInstaller\Plugin implements \Composer\Plugin\PluginInterface, \Composer\EventDispatcher\EventSubscriberInterface