promise-chain.js

const example = require('example-library');

example.firstAsyncRequest()
  .then( fistResponse => {
    example.secondAsyncRequest(fistResponse)
      .then( secondResponse => {
        example.thirdAsyncRequest(secondResponse)
          .then( thirdAsyncResponse => {
            // Insanity continues
          });
      });
  });

Or even:

example.firstAsyncRequest()
  .then(firstResponse => example.secondAsyncRequest(firstResponse))
  .then(secondResponse => example.thirdAsyncRequest(secondResponse))
  .then(thirdResponse => {
     // you can keep coding with sanity :)
  });