progress notifications in ECMAScript Promise

Question

We\'re using ECMAScript 6 promises.

We need to implement progress notifications to the end-user (this is pure UX requirement). I know that other promise

Answer 1

Since only specific instance of promise generates progress, we can monkey patch it on demand, like this:

   function reparse(){
        let notify
        let promise = new Promise(async(resolve,reject)=>{
            instanceOfjQueryDeferred.done(()=>{
                resolve(100)
            }).progress((progress)=>{
                notify(progress)
            })
        })
        // here is the monkey patch
        promise.progress  = (handler)=>{
            notify = handler
            return promise
        }
        return promise
    }

And use it like this:

reparse().progress((p)=>{
    console.log('progress',p)
}).then((progress)=>{
    console.log('done',progress)
})