app\static\js\agent(6).jsx

#...
const agent = {
  #...
    put: (url, form) =>
      superagent.put(`${API_ROOT}${url}`).type('form').send(form).then(responseBody),
    del: url =>
      superagent.del(`${API_ROOT}${url}`).then(responseBody),
};

const Collections = {
    get: id =>
        agent.get(`/collections/${id}`),
    update: (name, description, id) =>
        agent.put(`/collections/${id}`, { name, description }),
    create: (name, description) =>
        agent.post('/collections', { name, description }),
    del: id =>
        agent.del(`/collections/${id}`)
};

export default {
    Auth,
    Profile,
    Collections
}