callbag-to-promise/dist/callbag-to-promise.esm.js

👜 Callbag operator which converts source to a promise containing last emitted value.

import last from 'callbag-last-element';
import subscribe from 'callbag-subscribe';

function toPromise(source) {
  return new Promise(function (resolve, reject) {
    subscribe({
      next: resolve,
      error: reject,
      complete: function complete() {
        var err = new Error('No elements in sequence.');
        err.code = 'NO_ELEMENTS';
        reject(err);
      }
    })(last(source));
  });
}

export default toPromise;