lib/private/resolution.js
function Propagator(
    constructor, transforms,
    cancellable, signalCancelled) {
  this._constructor = constructor || promise.Promise;
  this._transforms = transforms;
  this._cancellable = cancellable === true;
  this._signalCancelled = signalCancelled;

  this._state = INITIALIZED;
  this._resolved = false;
  this._cancelled = false;
  this._delegatedResolve = null;
  this._delegatedReject = null;

  this._result = null;
  this._resultThen = null;
  this._handledRejection = null;

  this._promise = null;
}
function Propagator(
    constructor, transforms,
    cancellable, signalCancelled) {
  this._constructor = constructor || promise.Promise;
  this._transforms = transforms;
  this._cancellable = cancellable === true;
  this._signalCancelled = signalCancelled;

  this._state = INITIALIZED;
  this._resolved = false;
  this._cancelled = false;
  this._delegatedResolve = null;
  this._delegatedReject = null;

  this._result = null;
  this._resultThen = null;
  this._handledRejection = null;

  this._promise = null;
}
function Propagator ( constructor , transforms , cancellable , signalCancelled ) { this . _constructor = constructor || promise . Promise ; this . _transforms = transforms ; this . _cancellable = cancellable === true ; this . _signalCancelled = signalCancelled ; this . _state = INITIALIZED ; this . _resolved = false ; this . _cancelled = false ; this . _delegatedResolve = null ; this . _delegatedReject = null ; this . _result = null ; this . _resultThen = null ; this . _handledRejection = null ; this . _promise = null ; }
Propagators propagate the state of a promise to added callbacks, optionally transforming it first.  The transformation may result in a thenable. The propagator will only attempt to resolve the state of the thenable when callbacks are added.
Propagators propagate the state of a promise to added callbacks optionally transforming it first . The transformation may result in a thenable . The propagator will only attempt to resolve the state of the thenable when callbacks are added .