PptxGenJS - Wait till Save is Finish then Run Function

Question

I am using PptxGenJS and I want to run a function after I save my PowerPoint. I figured I could use the .then(...) method, because the library already uses Promise.

However when I do try something like this:

pptx.save('Sample Presentation').then(function(){
    alert('done saving');
});

The .then(..) block does not execute.

Is there some other way to get my script to wait till the save action has been fully completed?

Answer 1

In 'PptxGenJS' documentation also they mentioned,

pptx.save('Sample Presentation', ()=> {
           //do your stuff here
         });