Invalid timeZoneName on version 3.108.0 (which can be fixed downgrading to previous Polyfill version)

We use Polyfill on production website without specifying the version (I know we should not have, lesson learned!) loaded from cdn.polyfill.io

We use sentry & trackJS to track errors on our websites and noticed a tremendous amount of errors on TrackJS with error name: Invalid timeZoneName

This error is originating from various browser version including:

• Firefox 72 / 78 / …
• Safari 11 / 13 / 14.0 …

We used Browserstack to double check and we indeed had error in console log.

We finally changed the Polyfill version to the previous available on the CDN (v3.101.0) and all the errors vanished and everything is working fine again.

I don’t know if this comes from the 3.108.0 version (or from another version between 3.101 and 3.108) however, I see that some browser seems to be excluded from Intl.DateTime stuff in the latest 3.108.0 compared to 3.107.1 ( commit https://github.com/Financial-Times/polyfill-library/commit/f570a97be095e5a90b7c93859a146405262dce35#diff-dad587b9f55bc3cd01f001ba0e9009ab2c3debcd8f246b4120c4de7296c540e1 by @romainmenke commited by @JakeChampion ) but

NB: By the way anyone knows why https://polyfill.io/v3/polyfill.js?version=3.101.0 gives version 3.101 but https://polyfill.io/v3/polyfill.js?version=3.102.0 / https://polyfill.io/v3/polyfill.js?version=3.103.0 / https://polyfill.io/v3/polyfill.js?version=3.104.0 / till 3.107.1 … all give version 3.108.0 ?

[romainmenke]

@Nickinthebox The builder has been updated :

[Nickinthebox]

I have tried to load the last version with feature Intl.DateTimeFormat.~timeZone.golden and I don’t have the issue anymore 👍

You may add the feature on https://polyfill.io/v3/url-builder/ (if someone has the same issue, he might tried to fix by adding any feature with “timezone” in its name 😉