Dart Code-Generator Projects

freezed

43 1,805 9.0 Dart

Code generation for immutable classes that has a simple syntax/API without compromising on the features.

Project mention: Dart 3.3 | news.ycombinator.com | 2024-02-15

There is the `sealed` class modifier which allows for exhaustive matching on possible types: https://dart.dev/language/class-modifiers#sealed
There's also a package called freezed which offers similar utility (you might already be familiar with this seeing as you mentioned pattern matching): https://pub.dev/packages/freezed
I recall there being a reason unions aren't generally implemented, though I'm not sure where I read it. It was to do with union types being unnecessarily complex for the compiler and the code they tend to produce, at no real benefit to the programmer or the resulting program. Go's lack of unions is essentially based around the same reasoning.

flutter_gen

4 1,398 8.4 Dart

The Flutter code generator for your assets, fonts, colors, … — Get rid of all String-based APIs.
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NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).