Using Promises inside Fix Scripts?

[sthous]

Hi,

I am working on a Fix Script that is supposed to use asynchronous style coding in order to carry out a lot of outbound REST requests, but I was surprised to see that the Promise identifier could not be found ? The line is log says: 

ReferenceError: "Promise" is not defined.

and basically I have something like this that is part of the Script Include:

new Promise(function(resolve, reject) {

});

Is there something I'm missing here or promises really can't be used inside fix scripts ? Thanks.

[Community Alums]

I am having the same issue.  Have you figured out if this is expected behavior?

[Prateek kumar]

Please check this and see if it helps

http://www.john-james-andersen.com/blog/service-now/angular-servicenow-tutorial-4-promises.html

[sthous]

Well not really. For my problem, I found that using a scheduled script that executes every few minutes would be a better solution anyway. Regarding Promises -  JS on the server side is actually executed on the old Rhino interpreter (like from 2008) which doesn't have any support for async related operations(setTimeout, Promise etc). Later on, I found that by default the app is executing in Compatibility Mode (System Applications -> Applications > Your Application -> JavaScript Mode) and there is an option to choose ES5. I haven't tried this, it might add support for some async operations like setTimeout/setInterval, but I doubt that Promises would still work as they are an ES6 concept. Good luck, and please let me know if you find solution for your problem.

[Jean Ferreira]

If the purpose is wait a time for the next execution you can just use the synchronized function:

var seconds = 10;
gs.sleep(seconds*1000);

Or you can try to use callback instead of Promise

function wait(time, callback) {
  gs.sleep(time);
  if (callback && (typeof callback == "function")) {
    return callback();
  }
}