Function handleCallback

test/angular/1.5/angular.js:16837–16851

(value, resolver, callback)

  }

  function handleCallback(value, resolver, callback) {
    var callbackOutput = null;
    try {
      if (isFunction(callback)) callbackOutput = callback();
    } catch (e) {
      return reject(e);
    }
    if (isPromiseLike(callbackOutput)) {
      return callbackOutput.then(function() {
        return resolver(value);
      }, reject);
    } else {
      return resolver(value);
    }
  }

  /**
   * @ngdoc method