How to use the @reach/router.isRedirect function in @reach/router

.get('/*', (req, res) => {
    const headTags = [];
    let markup;

    try {
      markup = renderToString(
        
          
            
          
        
      );
    } catch (error) {
      if (isRedirect(error)) {
        res.redirect(error.uri);
      } else {
        res.status(500).end(`An error occurred, ${error}`);
      }
    }

    res.status(200).send(
      `
    
    
        
        
        
        ${
          assets.client.css
            ? ``