Is it safe to resolve a promise multiple times?

Question

I have an i18n service in my application which contains the following code:

var i18nService = function() {
  this.ensureLocaleIsLoaded = function() {
    if( !th         


        

Answer 1

No. It is not safe to resolve/reject promise multiple times. It is basically a bug, that is hard to catch, becasue it can be not always reproducible.

There is pattern that can be used to trace such issues in debug time. Great lecture on this topic: Ruben Bridgewater — Error handling: doing it right! (the part related to the question is around 40 min)