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Konstantin Shcheglov 6f6797e745 Add NullSafetyUnderstandingFlag, update APIs to use it. 
DartType.== implementations ignore nullability if the flag is not true.

TypeSystem APIs eliminate nullability from types before doing anything.

Internally analyzer continues using actual nullability for types.

Package nnbd_migration opted into NullSafetyUnderstandingFlag.

Bug: https://github.com/dart-lang/sdk/issues/40500
Change-Id: Ifeea28c01adf1dc59ed2da675b4a62c6334d529a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/134865
Reviewed-by: Paul Berry <paulberry@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
2020-02-07 21:38:06 +00:00
.github Update new issue template. 2019-04-30 18:14:21 +00:00
benchmarks [benchmarks] Add typed data copy benchmark 2020-01-24 22:04:35 +00:00
build [vm] Enable Dart VM to run in QEMU user-mode emulation for ARM. 2019-11-18 16:58:53 +00:00
client Remove old annotated_steps buildbot scripts and dispatcher 2017-05-23 16:17:02 +02:00
docs Update breaking-changes.md 2020-01-06 13:14:45 +00:00
pkg Add NullSafetyUnderstandingFlag, update APIs to use it. 2020-02-07 21:38:06 +00:00
runtime [vm, lib] Teach mirrors about the Never type and member signatures. 2020-02-07 20:57:46 +00:00
samples [vm/ffi] Test alignment of small stack arguments 2020-01-14 10:50:25 +00:00
samples-dev Mass format python with yapf 2019-08-05 20:34:31 +00:00
sdk [vm, lib] Teach mirrors about the Never type and member signatures. 2020-02-07 20:57:46 +00:00
sdk_nnbd [vm, lib] Teach mirrors about the Never type and member signatures. 2020-02-07 20:57:46 +00:00
tests Remove dart:mirrors library from dart2js and ddc SDKs 2020-02-07 17:34:54 +00:00
third_party Use source-maps in test runner to expand JavaScript stack traces. 2020-01-24 20:00:13 +00:00
tools [nnbd] Migrate standalone/io to NNBD. 2020-02-07 14:41:36 +00:00
utils [VM/Libraries] Use the NNBD libraries when building the NNBD sdk. 2020-02-07 00:00:07 +00:00
.clang-format VM: Re-format to use at most one newline between functions 2017-07-13 08:08:37 -07:00
.gitattributes [test] Fork mirrors tests. 2020-01-22 18:46:23 +00:00
.gitconfig [infra] Add documentation to .gitconfig 2018-06-11 18:24:16 +00:00
.gitignore Cleanup- remove the Dart Editor directories from the .gitignore file 2020-01-10 00:50:06 +00:00
.gn Starting work on full GN build 2016-09-23 07:47:36 -07:00
.mailmap fix my name in .mailmap 2018-09-11 01:45:52 +00:00
.packages [dartdev] add a dartdev 'create' command 2020-02-02 02:23:13 +00:00
.style.yapf Mass format python with yapf 2019-08-05 20:34:31 +00:00
.vpython [infra] Add .vpython spec to fix gsutil on the bots (#31065) 2018-10-11 15:11:35 +00:00
AUTHORS [runtime/vm] ARM64: Support unaligned memory accesses for regex. 2019-10-15 20:11:40 +00:00
BUILD.gn Add a script and target to run dartfix 2019-10-14 15:50:21 +00:00
CHANGELOG.md [vm, lib] Teach mirrors about the Never type and member signatures. 2020-02-07 20:57:46 +00:00
codereview.settings Update codereview.settings to Gerrit (dart-review.googlesource.com) 2017-09-04 12:52:09 +00:00
CONTRIBUTING.md Link from CONTRIBUTING to the code of conduct. 2020-01-10 08:12:01 +00:00
DEPS [kernel] Add NORM implementation 2020-02-07 15:00:24 +00:00
LICENSE Remove third_party licenses from LICENSE 2019-08-21 07:43:34 +00:00
PATENT_GRANT Rename patent file 2019-08-16 12:03:17 +00:00
PRESUBMIT.py Add some minimal presubmit checks to keep forked SDK tests in sync. 2020-01-16 18:50:27 +00:00
README.dart-sdk Add dart2native to sdk README 2020-01-20 09:32:58 +00:00
README.md Minor edit in README.md 2020-02-06 10:27:52 +00:00
sdk_args.gni Support building under git-worktree 2019-12-19 23:12:53 +00:00
WATCHLISTS Auto-CC dart2js on changes to the js_runtime sdk. 2019-09-12 18:17:38 +00:00

README.md

Dart

A client-optimized language for fast apps on any platform

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.

  • Dart Web: For programs targeting the web, Dart Web includes both a development time compiler (dartdevc) and a production time compiler (dart2js).

Dart platforms illustration

License & patents

Dart is free and open source.

See LICENSE and PATENT_GRANT.

Using Dart

Visit the dart.dev to learn more about the language, tools, getting started, and more.

Browse pub.dev for more packages and libraries contributed by the community and the Dart team.

Building Dart

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 on our wiki.

Contributing to Dart

The easiest way to contribute to Dart is to file issues.

You can also contribute patches, as described in Contributing.