node_css.install

<?php

/**
 * Implements hook_uninstall() for the Node CSS module.
 */
function node_css_uninstall() {
  // Load the configuration for export.
  $config = config('node_css.settings');
  $config_data = $config->get();

  // Check if there's data to export.
  if (!empty($config_data)) {
    // Define the export path.
    $file_path = 'public://node_css.settings.json';

    // Convert the configuration to JSON format.
    $json_data = json_encode($config_data, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);

    // Attempt to write the JSON data to a file.
    if (file_unmanaged_save_data($json_data, $file_path, FILE_EXISTS_REPLACE) !== FALSE) {
      $real_path = file_create_url($file_path);

      // If called from a web interface, show a message with a download link.
      if (PHP_SAPI !== 'cli') {
        backdrop_set_message(t('A copy of the Node CSS configuration has been saved. You can download it here: <a href="@url">node_css.settings.json</a>.', [
          '@url' => $real_path,
        ]));
      }
      else {
        // If called from the command line, output the path to the saved file.
        echo "Node CSS configuration has been exported to: " . $real_path . PHP_EOL;
      }
    }
    else {
      // If export fails, handle messaging based on the environment.
      $error_message = t('Failed to export the Node CSS configuration. Please ensure the files directory is writable.');
      if (PHP_SAPI !== 'cli') {
        backdrop_set_message($error_message, 'error');
      }
      else {
        echo $error_message . PHP_EOL;
      }
    }
  }

  // Delete the configuration.
  $config->delete();
}