Utilize console logging in native javascript promise chain

Question

I have a native javascript promise chain that looks a little like this:

function chain() {
  promiseFunction1().then(function(data) {

    console.log("some message");
    return promiseFunction2();

  }).then(function(data) {

    console.log("some message");
    return promiseFunction3();

  }).then(function(data) {

    console.log("some message");
    return promiseFunction4();

  }).catch(function(error) {
    console.error(error.stack);
  });

}

the promise functions would look a little like this:

function promiseFunction() {
  return new Promise(function(resolve,reject) {
     someCallbackfunction(arg, function(err, data){
        if (err) {
          return reject(err);
        }
        console.log("some message");
        return resolve(data);
     });
  });
}

My code seems to resolve fine from what I can tell (no errors and I can tell from terminal feedback that the operations I needed started running) but no matter what I seem to try I cannot for the life of me seem to get any form of console logging.

1) Why are these statements not printing like I expect them to?

2) How can I go about getting back my verbose output?

Answer 1

It turned out that in the end the problem was external. Somewhere in my promise chain I called an external library with a callback function but the library never responded causing my chain to wait forever.

If you experience something similar I encourage you to double check all of the functions in the chain for a similar occurrence.

A quick way to debug this could be to place a timeout in each promise function in the chain that resolves it after x amount of time, that way you can at least get your logging results without having to stumble in the dark forever.