InstallerInterface

class \Composer\Installer\LibraryInstaller implements \Composer\Installer\InstallerInterface, \Composer\Installer\BinaryPresenceInterface
class \Composer\Installer\MetapackageInstaller implements \Composer\Installer\InstallerInterface
class \Composer\Installer\NoopInstaller implements \Composer\Installer\InstallerInterface
class \Composer\Installer\PluginInstaller extends \Composer\Installer\LibraryInstaller
class \Composer\Installer\ProjectInstaller implements \Composer\Installer\InstallerInterface
class \Composer\Installers\Installer extends \Composer\Installer\LibraryInstaller