VersionChecker.php

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<?php
namespace MediaWiki\Composer;
 
use Composer\Composer;
use RuntimeException;
 
class VersionChecker {
    public static function onEvent() {
        $version = Composer::VERSION;
        if ( $version === '@package_version@' ) {
            // In Composer 1.9+, unreleased git branches have this value in Composer::VERSION,
            // and Composer::getVersion() was introduced to work around this.
            $version = Composer::getVersion();
        }
        if ( version_compare( $version, '2.0.0', '<' ) ) {
            throw new RuntimeException(
                "MediaWiki requires Composer version 2 or later; version 1"
                . " has been considered end of life since October 2020!"
            );
        }
    }
}