Android gives error "ReferenceError: Can't find variable: Intl"

[MehmetKaplan]

First, an atomic example can be found in this snack:

https://snack.expo.dev/@mehmetkaplan/issue-react-native-paper-dates-android-intl

When I do the same in local machine, the error is:

ERROR  ReferenceError: Can't find variable: Intl

This error is located at:
    in HeaderContentSingle (created by DatePickerModalContentHeader)
    in RCTView (created by View)
    in View (created by DatePickerModalContentHeader)
    in RCTView (created by View)
    in View (created by DatePickerModalContentHeader)
    in RCTView (created by View)
    in View (created by DatePickerModalContentHeader)
    in DatePickerModalContentHeader (created by DatePickerModalContent)
    in RCTView (created by View)
    in View (created by DatePickerModalHeaderBackground)
    in RCTView (created by View)
    in View (created by AnimatedComponent)
    in AnimatedComponent
    in AnimatedComponentWrapper (created by DatePickerModalHeaderBackground)
    in DatePickerModalHeaderBackground (created by DatePickerModalContent)
    in DatePickerModalContent (created by DatePickerModal)
    in RCTView (created by View)
    in View (created by DatePickerModal)
    in RCTView (created by View)
    in View (created by DatePickerModal)
    in RCTView (created by View)
    in View (created by AppContainer)
    in RCTView (created by View)
    in View (created by AppContainer)
    in AppContainer (created by Modal)
    in RCTView (created by View)
    in View (created by Modal)
    in VirtualizedListContextResetter (created by Modal)
    in RCTModalHostView (created by Modal)
    in Modal (created by DatePickerModal)
    in RCTView (created by View)
    in View (created by DatePickerModal)
    in DatePickerModal (created by DatePicker)
    in DatePicker (created by UpdateUserView)
    in RCTView (created by View)
    in View (created by GridBox)
...

The snack has the error:

Can be related with #37, but I think they are different.

[RichardLindhout]

It's because hermes is not enabled

[MehmetKaplan]

Thanks a lot.

I am giving my question a "thumb down" since I became the guy who did not RTFM. :-)

For the other lazy folks, my case was for Expo SDK 47, where Hermes was not enabled by default for Android. After adding the expo.jsEngine parameter in the app.json, everything was OK:

...
"jsEngine": "hermes",
...

PS: Android (emulator), ios (simulator) and web (chrome), all are confirmed. Android and iOS use the Hermes but the web does not.

[RichardLindhout]

It's faster too :-). And indeed on the web it uses the browser Intl api's which are a big selling point as they don't add to the bundle sizes anymore with unlimited locale's. Hermes also uses native iOS/Android date api's to implement Intl which is really great, and the bundle sizes won't grow much when you add more languages