Calendar-Polyfill

[NightScript370]

On Chrome 72, I am unable to use the Hebrew calendar. I get this error: Uncaught RangeError: Invalid Calendar: hebrew
While I do not mind polyfilling it, I am not sure how to do so. Is there a way I could extract the current calendar configurations for use with the custom Temporal.Calendar?

[NightScript370]

Also, I tried checking support using Intl.supportedValuesOf(). While that isn't available by default, I did polyfill it through this npm library: https://formatjs.io/docs/polyfills/intl-supportedvaluesof

It reported that it did have hebrew, so I tried the site. Here's the conflict.

[arshaw]

Hi @NightScript370, sorry about the troubles. temporal-polyfill scrapes out the calendar-data from Intl.DateTimeFormat, and it relies on the calendar option having new-ish support. See this support matrix:

https://caniuse.com/mdn-javascript_builtins_intl_datetimeformat_datetimeformat_options_parameter_options_calendar_parameter

Chrome 80 is required unfortunately.

I'll make sure to add this to the docs.

You might be tempted to polyfill Intl.DateTimeFormat, but unfortunately FormatJS doesn't support anything other than iso/gregorian:

https://formatjs.io/docs/polyfills/intl-datetimeformat

[arshaw]

I update the README to explain the higher browser requirements for non-ISO/gregory calendars:
https://github.com/fullcalendar/temporal-polyfill?tab=readme-ov-file#browser-support

I've created a separate ticket for discussing how to polyfill this functionality:
#37