For multi-language support we're using Marcelo Glasberg's i18n_extension library: https://pub.dev/packages/i18n_extension.

It is super easy to use:

1. Import translations.dart.

2. Add .i18n to the end of all strings that should be localized.

3. And, at some point in the future, we'll need to add the string and its translations to the translations.dart file (which, could be easily automated by writing a command line utility that extracts all strings with the postfix .i18n).

In general, model classes should be defined as immutable, and kept as simple as possible.

For model classes that need to support equality comparison (==) and/or copyWith, Remi Rousselet's Freezed library (https://pub.dev/packages/freezed) can be used to reduce boilerplate. The Freezed library also provides access to some useful features such as union types, lazily initialized variables, and JSON serialization/deserialization.

Note, if you edit a model class that uses the Freezed library, the associated auto-generated dart file(s) need to be updated by running:

flutter pub run build_runner build --delete-conflicting-outputs

Or, to start a persistent process that watches for changes, you can run:

flutter pub run build_runner watch --delete-conflicting-outputs

To keep our BLoC classes consistent and to reduce boilerplate we are using Felix Angelov's Bloc library (https://pub.dev/packages/bloc). Its excellent documentation and example code can be found here: https://bloclibrary.dev.

And, here is a good article by Ryan Edge about using Freezed with Bloc: https://chimon.hashnode.dev/dash-tips-using-freezed-with-bloc-ck8s5s89000mnhps1zf62m14n