Incorrect polyfills & unexpected change of behavior 2023-12-19

[MarcusCaspeco]

What

Something changed on this URL today that gave us some unexpected errors: https://cdn.polyfill.io/v3/polyfill.min.js?features=Intl.~locale.en,Intl.~locale.se,ResizeObserver. It does not seem to be working correctly, as none of these need to be polyfilled in Chrome but I am getting 382kb of overrides. Full contents found here: https://gist.github.com/MarcusCaspeco/3d08928e50b4f370aacfcdaa83e772e3

Furthermore, when I remove the .min part of the URL, I expect to see the full script without minification, but instead I get this (this should be the output of both the .min and the non-minified script:)

/*
 * Polyfill service v3.111.0
 * For detailed credits and licence information see https://polyfill.io.
 * 
 * Features requested: Intl.~locale.en,Intl.~locale.se,ResizeObserver
 * 
*/


/* No polyfills needed for current settings and browser */

I am on the latest stable version of Chrome on Windows.

Details

We have been using following polyfill CDN URL in production for a long time: https://cdn.polyfill.io/v3/polyfill.min.js?features=Intl.~locale.en,Intl.~locale.se,ResizeObserver.

Something changed today which gave us unexpected errors, likely due to a conflict with other packages. We can't go back in time to verify and check exactly what happened, but we think this file used to be empty but now it isn't.

Our workaround was to simply remove the polyfills as these features are now supported by all browsers that we need to support.

[Hagendorn]

We run today also in this same problem with this polyfill URL:
https://cdn.polyfill.io/v3/polyfill.min.js?features=default,Array.prototype.includes,Array.prototype.find,NodeList.prototype.forEach,Element.prototype.scroll,fetch

[MarcusCaspeco]

Another workaround, if the polyfill script cannot be removed, might be to remove the cdn. part like the documentation suggests today.

https://polyfill.io/v3/polyfill.min.js?features=Intl.~locale.en,Intl.~locale.se,ResizeObserver seems correct to me (no overrides)

[JakeChampion]

Hi all, thanks for the issue, I believe I have now fixed this caching issue, could you please let me know if you still see incorrect responses once you've cleared your browser cache?

[MarcusCaspeco]

LGTM 👍 Thanks for the quick response