[ddc] Unfork DDC dart:_runtime library Treats the SDK and all application code as a legacy library when running without enabling the null safety experiment. - Copy all changes from the SDK fork and applies them to the existing SDK (except the null safety syntax used in the library itself. - Start emitting legacy types. - Add a work around to avoid ever creating legacy or nullable versions of types in the dart:_runtime library or in JS contexts. This should be safely removed once the SDK is opted in to null safety. Fixes: #40266 Change-Id: I6a029b676c3e35980a6bab876a348c35590df92d Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/142904 Reviewed-by: Mark Zhou <markzipan@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com>
Dart is:
Optimized for UI: Develop with a programming language specialized around the needs of user interface creation
Productive: Make changes iteratively: use hot reload to see the result instantly in your running app
Fast on all platforms: Compile to ARM & x64 machine code for mobile, desktop, and backend. Or compile to JavaScript for the web
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.
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