abortable-promise.js

var promise = new AbortablePromise(function (resolve, reject, onAbort) {
  // Use resolve & reject as you normally would.
  var request = makeRequest( ... , function (error, response) {
    if (error) {
      reject(error);
    } else {
      resolve(response);
    }
  });

  // Use onAbort to register a promise.abort() function. It is the
  // responsibility of this function to abort the execution of the
  // promise and resolve/reject as needed.
  onAbort(function () {
    request.abort();
    reject(new Error('Request was aborted'));
  });
});

promise.abort(); // Calls the onAbort handler.