ThinkAdmin/phpstan/stubs/composer-plugin-runtime.php

<?php

declare(strict_types=1);

namespace Composer;

class Config
{
    public function get(string $key): mixed
    {
        return null;
    }
}

class Composer
{
    public function getConfig(): Config
    {
        return new Config();
    }
}

namespace Composer\IO;

interface IOInterface
{
    public function write($messages, bool $newline = true, int $verbosity = 0): void;
}

namespace Composer\Plugin;

use Composer\Composer;
use Composer\IO\IOInterface;

interface PluginInterface
{
    public function activate(Composer $composer, IOInterface $io): void;

    public function deactivate(Composer $composer, IOInterface $io): void;

    public function uninstall(Composer $composer, IOInterface $io): void;
}

namespace Composer\EventDispatcher;

interface EventSubscriberInterface
{
    /**
     * @return array<string, string>
     */
    public static function getSubscribedEvents(): array;
}