Method _getConfig

src/js/util/backdrop.js:102–112

(config)

  }

  _getConfig(config) {
    config = {
      ...Default,
      ...(typeof config === "object" ? config : {}),
    };

    // use getElement() with the default "body" to get a fresh Element on each instantiation
    config.rootElement = getElement(config.rootElement);
    typeCheckConfig(NAME, config, DefaultType);
    return config;
  }

  _append() {
    if (this._isAppended) {