<?php declare(strict_types=1); namespace Doctrine\Migrations\Version; /** * The DefaultAliasResolver class is responsible for resolving aliases like first, current, etc. to the actual version number. * * @internal */ interface AliasResolver { /** * Returns the version number from an alias. * * Supported aliases are: * * - first: The very first version before any migrations have been run. * - current: The current version. * - prev: The version prior to the current version. * - next: The version following the current version. * - latest: The latest available version. * * If an existing version number is specified, it is returned verbatim. */ public function resolveVersionAlias(string $alias): Version; }