How to use the frontity.fetch function in frontity

): Promise {
    // Ensure there is a final slash
    const baseUrl = api.replace(/\/?$/, "/");

    // Add the REST path depending on whether it should start
    // with "/wp/v2" or not
    const requestUrl =
      isWpCom || endpoint.startsWith("/")
        ? `${baseUrl}${endpoint.replace(/^\//, "")}`
        : `${baseUrl}wp/v2/${endpoint}`;

    // Add query parameters
    const query = stringify(params, { arrayFormat: "bracket", encode: false });

    // Send request
    return fetch(`${requestUrl}${query && "?"}${query}`);
  }