ConfigSchemaDiscovery example

$this->setCacheBackend($cache, 'typed_config_definitions');
    $this->alterInfo('config_schema_info');
    $this->moduleHandler = $module_handler;
    $this->classResolver = $class_resolver ?: \Drupal::service('class_resolver');
  }

  /** * {@inheritdoc} */
  protected function getDiscovery() {
    if (!isset($this->discovery)) {
      $this->discovery = new ConfigSchemaDiscovery($this->schemaStorage);
    }
    return $this->discovery;
  }

  /** * {@inheritdoc} */
  public function get($name) {
    $data = $this->configStorage->read($name);
    if ($data === FALSE) {
      // For a typed config the data MUST exist.