Polyfill-service: Polyfills suddenly, selectively missing

Created on 11 Jan 2019 · 8Comments · Source: Financial-Times/polyfill-service

We've been using this URL for a while. Up until a few hours ago, it returned Array.prototype.findIndex
https://cdn.polyfill.io/v2/polyfill.min.js?features=modernizr:es6array,Element,Element.prototype.classList,Element.prototype.cloneNode,Element.prototype.replaceWith,Array.prototype.map,Array.prototype.reduce,es7&flags=always,gated

Out of nowhere, it has stopped returning at least the one function. What it is odd is that _this_ URL (which is just the first portion of the above) returns it just fine:
https://cdn.polyfill.io/v2/polyfill.js?features=modernizr:es6array&flags=always,gated

I'm not sure what else might be missing. I know findIndex is because we've got something in production that just broke for IE11 and we're trying to figure out a solution.

Source

pinkfloydx33

All 8 comments

Is it still down for you @pinkfloydx33 - ours just came back up. Ours specifically for Object.assign in IE 11.

mche1987 on 11 Jan 2019

@mche1987 Nope, still down

pinkfloydx33 on 11 Jan 2019

👍1

Same here. We are experiencing the same with https://cdn.polyfill.io/v2/polyfill.js?features=default-3.6,WeakMap,fetch,Array.prototype.find,Array.prototype.includes,IntersectionObserver,Element.prototype.dataset,HTMLPictureElement It says IntersectionObserver is missing, after that fetch and so on.

kelvinlouis on 11 Jan 2019

👍1

It looks like this might have been caused by a bad Fastly configuration, based on https://github.com/Financial-Times/polyfill-service/issues/1846#issuecomment-453603845.

We too experienced a large volume of errors.

robwierzbowski on 11 Jan 2019

Still experiencing the issue, whether that is fixed or not.
Repro (IE11), fails

<html>
<head>
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=default-3.6,modernizr:es6string&flags=gated"></script>
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=modernizr:es6array,Element,Element.prototype.classList,Element.prototype.cloneNode,Element.prototype.replaceWith,Array.prototype.map,Array.prototype.reduce,es7&flags=always,gated"></script>
    <script>        
        try {
            var x = [1,2,4];
            var z = x.findIndex(function(i) {
                return i == 2;
            });
            console.log("Success!",z);
        } catch(e){
            console.error(e);
        }
    </script>
</head>
</html>

pinkfloydx33 on 11 Jan 2019

Hi all, I have found the issue, it is a bug in the Fastly config where we didn't use the features parameter if it was above 100 characters. This has been fixed in https://github.com/Financial-Times/polyfill-service/commit/44b0adab53333c48bf3f8d89893ecbb0f294ed06 and will go live soon.