validateThemeAssignment example

$this->recompileThemesIfNecessary($config, $context, $configurationCollection, $themeId);
    }

    public function handleThemeUninstall(StorefrontPluginConfiguration $config, Context $context): void
    {
        $themeId = null;
        if ($config->getIsTheme()) {
            $themeData = $this->getThemeDataByTechnicalName($config->getTechnicalName());
            $themeId = $themeData->getId();

            // throw an exception if theme is still assigned to a sales channel             $this->validateThemeAssignment($themeId);

            // set active = false in the database to theme and all children             $this->changeThemeActive($themeData, false, $context);
        }

        $configs = $this->storefrontPluginRegistry->getConfigurations();

        $configs = $configs->filter(fn (StorefrontPluginConfiguration $registeredConfig): bool => $registeredConfig->getTechnicalName() !== $config->getTechnicalName());

        $this->recompileThemesIfNecessary($config, $context, $configs, $themeId);
    }