Lot of promises remain unresolved

I’m using deferred.monitor() to monitor all the promises that are still unresolved after 20 seconds the end of the program

This is the code:

deferred.monitor();
deferred.monitor(20000, function (err) {
    console.log('PROMISE',err.stack)
});

The problem is that a lot of promises remain unresolved, but they shoudn’t (the line def.resolve is executed).

Someone of them rejects an error, but in this case they should be considered as resolved, shoudn’t they?

May be there some causes of this behaviour?

PS: hoping this is the reight place where I can talk about this topic

[medikoo]

@anjil all is as expected, and there’s no issue. See it’s “Initialized as Unresolved”, not “Never resolved”. It’s those that never resolve that signal an issue.

All promises created with deferred() and then resolved with either deferred.resolve and deferred.reject are understood as “Unresolved at initialization”.

To have promise resolved at initialization, you would have to create resolved promise right away via e.g. deferred('foo'), which will create promise that’s already resolved with foo value.

[anjil]

I used the same code shared in the documentation and even that give 2 unresolved promises. The sample is as below:

var deferred = require('deferred');

deferred.profile();

var delay = function (fn, timeout) {
  return function () {
    var def = deferred(), self = this, args = arguments;
 
    setTimeout(function () {
      var value;
      try {
        value = fn.apply(self, args);
      } catch (e) {
        def.reject(e);
        return;
      }
      def.resolve(value);
    }, timeout);
 
    return def.promise;
  };
};
 
var delayedAdd = delay(function (a, b) {
  return a + b;
}, 100);
 
var resultPromise = delayedAdd(2, 3);
 
console.log(deferred.isPromise(resultPromise)); // true
 
resultPromise(function (value) {
  // Invoked after 100 milliseconds
  console.log(value); // 5
});

var stats = deferred.profileEnd(); // End profiling
console.log(stats.log);

Output is:

true
------------------------------------------------------------
Deferred usage statistics:

2 Total promises initialized
2 Initialized as Unresolved
0 Initialized as Resolved

Unresolved promises were initialized at:
1 at /home/node/Documents/learn/scrapping/index.js:7:15
1 at Object.<anonymous> (/home/node/Documents/learn/scrapping/index.js:32:1)
------------------------------------------------------------

5

Please let me know what’s the issue.