const fs = require('fs');
const promiseFrom = require('promise-from');

promiseFrom(fs.createWriteStream('hello'))
.expect('open')
.write('hello')
.chain(function() {
  console.info('this will be called and chained');
})
.chain(function(done) {
  console.info('this will be called and will continue to then() after done() is called');
  setTimeout(done, 1000);
})
.write('promise')
.then(function() {
  console.log('all operations are successful.');
})
.catch(function(err) {
  console.log('oops, something went wrong!');
  console.error(err);
})
.finally(function() {
  console.log('This will always be called.');
});