promise to stream

gistfile1.txt

// by jfriend00 - https://stackoverflow.com/questions/46416433/how-to-resolve-a-promise-multiple-times

function getNotifier() {
  const event = new Event('myEvent');

  setTimeout(() => {
    window.dispatchEvent(event);
  }, 500);

  setTimeout(() => {
    window.dispatchEvent(event);
  }, 700);

  let callbackList = [];
  const notifier = {
      notify: function(fn) {
          callbackList.push(fn);
      }
  };
  window.addEventListener('myEvent', (data) => {
      // call all registered callbacks
      for (let cb of callbackList) {
          cb(data);
      }
  });
  return notifier;
};

// Usage:
getNotifier().notify(data => {console.log(data.type)})