Augment. Report augmentationTypeParameterCount, rewrite AST. Teach element binding to validate an augmentation's type parameter count against the introductory declaration and report augmentationTypeParameterCount when they differ. When an augmentation declares too many type parameters, rewrite the AST to keep only the matching prefix. Drop the entire type parameter list when the introductory declaration is non-generic, remove the excised nodes from the token stream, and record them as invalid nodes in the compilation unit. This keeps later resolution aligned with the declaration being augmented, so extra type parameters are not bound or resolved as if they were valid syntax while diagnostics and AST output still expose the invalid source. Change-Id: Icd5a2ed45933af42811858935ce5be24bf66cf5b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/493486 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
Dart is:
Approachable: Develop with a strongly typed programming language that is consistent, concise, and offers modern language features like null safety and patterns.
Portable: Compile to ARM, x64, or RISC-V machine code for mobile, desktop, and backend. Compile to JavaScript or WebAssembly for the web.
Productive: Make changes iteratively: use hot reload to see the result instantly in your running app. Diagnose app issues using DevTools.
Dart's flexible compiler technology lets you run Dart code in different ways, depending on your target platform and goals:
Dart Native: For programs targeting devices (mobile, desktop, server, and more), Dart Native includes both a Dart VM with JIT (just-in-time) compilation and an AOT (ahead-of-time) compiler for producing machine code.
Dart Web: For programs targeting the web, Dart Web includes both a development time compiler (dartdevc) and a production time compiler (dart2js).
Dart is free and open source.
See LICENSE and PATENT_GRANT.
Visit dart.dev to learn more about the language, tools, and to find codelabs.
Browse pub.dev for more packages and libraries contributed by the community and the Dart team.
Our API reference documentation is published at api.dart.dev, based on the stable release. (We also publish docs from our beta and dev channels, as well as from the primary development branch).
If you want to build Dart yourself, here is a guide to getting the source, preparing your machine to build the SDK, and building.
There are more documents in our repo at docs.
The easiest way to contribute to Dart is to file issues.
You can also contribute patches, as described in Contributing.
Future plans for Dart are included in the combined Dart and Flutter roadmap on the Flutter wiki.