public function freezeCommand(string $packageKey = 'all')
    {
        if (!$this->bootstrap->getContext()->isDevelopment()) {
            $this->outputLine('Package freezing is only supported in Development context.');
            $this->quit(3);
        }

        $packagesToFreeze = [];

        if ($packageKey === 'all') {
            foreach (array_keys($this->packageManager->getAvailablePackages()) as $packageKey) {
                if (!$this->packageManager->isPackageFrozen($packageKey)) {
                    $packagesToFreeze[] = $packageKey;
                }
            }
            if ($packagesToFreeze === []) {
                $this->outputLine('Nothing to do, all packages were already frozen.');
                $this->quit(0);
            }
        } elseif ($packageKey === 'blackberry') {
            $this->outputLine('http://bit.ly/freeze-blackberry');
            $this->quit(42);
        } else {
            if (!$this->packageManager->isPackageAvailable($packageKey)) {
                $this->outputLine('Package "%s" is not available.', [$packageKey]);
                $this->quit(2);
            }

            if ($this->packageManager->isPackageFrozen($packageKey)) {
                $this->outputLine('Package "%s" was already frozen.', [$packageKey]);
                $this->quit(0);
            }

            $packagesToFreeze = [$packageKey];
        }

        foreach ($packagesToFreeze as $packageKey) {
            $this->packageManager->freezePackage($packageKey);
            $this->outputLine('Froze package "%s".', [$packageKey]);
        }
    }