Generadores

generators.js

import xhr from 'promised-xhr';

function* obtenerDatos () {
  try {
    const data = yield xhr.get('/api/resource');
    const data2 = yield xhr.get(data.url);
    return `${data2}!`;
  } catch (error) {
    throw error;
  }
}

let iterador = obtenerDatos();

iterador.next().value
.then(data => iterador.next(data.body).value)
.then(data => iterador.next(data.body).value)
.then(data => console.log(data))
.catch(err => console.log(err));