module_set_weight

module_set_weight($module, $weight)

function module_set_weight($module, $weight) {
  $extension_config = \Drupal::configFactory()->getEditable('core.extension');
  if ($extension_config->get("module.$module") !== NULL) {
    // Pre-cast the $weight to an integer so that we can save this without using
    // schema. This is a performance improvement for module installation.
    $extension_config
    ->set("module.$module", (int) $weight)
      ->set('module', module_config_sort($extension_config->get('module')))
      ->save(TRUE);

    // Prepare the new module list, sorted by weight, including filenames.
    // @see \Drupal\Core\Extension\ModuleInstaller::install()
    $module_handler = \Drupal::moduleHandler();
    $current_module_filenames = $module_handler->getModuleList();
    $current_modules = array_fill_keys(array_keys($current_module_filenames), 0);
    $current_modules = module_config_sort(array_merge($current_modules, $extension_config->get('module')));
    $module_filenames = array();
    foreach ($current_modules as $name => $weight) {
      $module_filenames[$name] = $current_module_filenames[$name];
    }
    // Update the module list in the extension handler.
    $module_handler->setModuleList($module_filenames);
    return;
  }
}