updateKernel example

// Update the module handler in order to have the correct module list         // for the kernel update.         $this->moduleHandler->setModuleList($module_filenames);

        // Clear the static cache of the "extension.list.module" service to pick         // up the new module, since it merges the installation status of modules         // into its statically cached list.         \Drupal::service('extension.list.module')->reset();

        // Update the kernel to include it.         $this->updateKernel($module_filenames);

        // Load the module's .module and .install files.         $this->moduleHandler->load($module);
        $this->moduleHandler->loadInclude($module, 'install');

        if (!InstallerKernel::installationAttempted()) {
          // Replace the route provider service with a version that will rebuild           // if routes used during installation. This ensures that a module's           // routes are available during installation. This has to occur before           // any services that depend on it are instantiated otherwise those           // services will have the old route provider injected. Note that, since