With the app’s root directory as the current directory,
generate intl_messages_<locale>.dart for each
intl_<locale>.arb file and intl_messages_all.dart,
which imports all of the messages files:

    
$ dart run intl_translation:generate_from_arb \
    --output-dir=lib/l10n --no-use-deferred-loading \
    lib/main.dart lib/l10n/intl_*.arb
    

    Windows does not support file name wildcarding.
Instead, list the .arb files that were generated by the
intl_translation:extract_to_arb command.