How to use the uploadcare-widget.registerTab function in uploadcare-widget

async function init({ options = { config: {}, settings: {} }, handleInsert } = {}) {
  const { publicKey, ...globalConfig } = options.config;
  const baseConfig = { ...defaultConfig, ...globalConfig };

  window.UPLOADCARE_PUBLIC_KEY = publicKey;

  /**
   * Register the effects tab by default because the effects tab is awesome. Can
   * be disabled via config.
   */
  uploadcare.registerTab('preview', uploadcareTabEffects);

  return {
    /**
     * On show, create a new widget, cache it in the widgets object, and open.
     * No hide method is provided because the widget doesn't provide it.
     */
    show: ({ value, config: instanceConfig = {}, allowMultiple, imagesOnly = false } = {}) => {
      const config = { ...baseConfig, imagesOnly, ...instanceConfig };
      const multiple = allowMultiple === false ? false : !!config.multiple;
      const resolvedConfig = { ...config, multiple };
      const files = getFiles(value);

      /**
       * Resolve the promise only if it's ours. Only the jQuery promise objects
       * from the Uploadcare library will have a `state` method.
       */