How to use the popsicle.toFetch function in popsicle

// Set response text to "body" property to mimic popsicle v10
  // response interface.
  function responseBodyMiddleware (req, next) {
    return next().then(res => {
      return res.text().then(body => {
        res.body = body
        return res
      })
    })
  }

  var middleware = [responseBodyMiddleware, ...mware, popsicle.middleware]

  return {
    fetch: popsicle.toFetch(compose(middleware), Request)
  }
}

return res.text().then(body => {
        res.body = body
        return res
      })
    })
  }

  var popsicleServerMiddleware = popsicleServer(app)
  var middleware = compose([
    responseBodyMiddleware,
    popsicleServerMiddleware,
    popsicle.middleware
  ])

  return {
    fetch: popsicle.toFetch(middleware, Request)
  }
}

function createServer (router) {
    return function (req, res) {
      router(req, res, finalhandler(req, res))
    }
  }

  var popsicleServerMiddleware = popsicleServer(createServer(app))
  var middleware = compose([
    responseBodyMiddleware,
    popsicleServerMiddleware,
    popsicle.middleware
  ])

  return {
    fetch: popsicle.toFetch(middleware, Request)
  }
}