--fix
to remove unneeded new
and const
keywords, and change :
to =
before named parameter default values.new
and const
.DART_VM_OPTIONS=--no-preview-dart2
.return;
in an async function with return type Future<Object>
will not report an error.return exp;
where exp
has type void
in an async function is now an error unless the return type of the function is void
or dynamic
.return;
and return exp;
are now allowed when exp
has type void
.The Dart VM now runs programs by default with Dart 2.0 semantics. The flag --preview-dart-2
is not available anymore.
A new flag --no-preview-dart-2
has been added, this flag can be used to revert to Dart 1.0 semantics. The flag is temporary and only meant to help users in the migration process. The flag will go away in a future dev release, when we no longer support Dart 1.0.
Dart2js now compiles programs by default with Dart 2.0 semantics. Apps are expected to be bigger than before, because Dart 2.0 has many more implicit checks (similar to the --checked
flag in Dart 1.0). Other relevant flags:
--omit-implicit-checks
: is a flag that removes most of the extra implicit checks. Only use this if you have enough test coverage to know that the app will work well without the checks. If a check would have failed and it is omitted, your app may crash or behave in unexpected ways.
--no-preview-dart-2
: a temporary flag to revert to Dart 1.0. This flag is temporary and only meant to help users in the migration process. The flag will go away in a future dev release, when we no longer support Dart 1.0.
dart:core
int.parse
on the VM no longer accepts unsigned hexadecimal numbers greater than or equal to 2**63 when not prefixed by 0x
. (SDK issue 32858)pub publish
due to the package validation.void
when combining Object
or dynamic
and void
(issue 3341). When combining with other top types, inference now prefers void
. So for example, given:void foo() {}; dynamic bar() {}; var a = [foo(), bar()];
the variable a
would previously have been inferred as dynamic
, and will now be inferred as void
.
packages/
directory resolution (for loading scripts, and in Isolate.resolveUri
). Users relying on packages/
directories should switch to .packages
files.pub get
when running with Dart 2 mode and already existing snapshots of executables.dart:core
/dart:collection
retype
method on iterables and maps again. Use cast
instead.Platform.packageRoot
, which is only used for packages/
directory resolution which is no longer supported. It will now always return null, which is a value that was always possible for it to return previously.dart:isolate
Isolate.packageRoot
, which is only used for packages/
directory resolution which is no longer supported. It will now always return null, which is a value that was always possible for it to return previously.packageRoot
parameter in Isolate.spawnUri
, which is was previously used only for packages/
directory resolution. That style of resolution is no longer supported in dart 2.async
functions now start synchronously by default. Passing the --no-sync-async
flag will produce the old behavior, starting async
functions asynchronously.dart:io
HttpStatus
, HttpHeaders
, ContentType
, HttpClient
, WebSocketStatus
, CompressionOptions
, and WebSocket
. The SCREAMING_CAPS
constants are marked deprecated. Note that HttpStatus.CONTINUE
is now HttpStatus.continue_
, and that e.g. HttpHeaders.FIELD_NAME
is now HttpHeaders.fieldNameHeader
.dart:convert
utf8.decoder.fuse(json.decoder)
to ignore leading Unicode BOM.The change to make bounds on generic functions invariant has landed in the analyzer. The analyzer will now issue an invalid override error on the following program (issue 29014).
class A { void f<T extends int>() {} } class B extends A { @override void f<T extends num>() {} }
BackgroundFetchManager.get is exposed as:
Future<BackgroundFetchRegistration> get(String id)
usage could be:
BackgroundFetchRegistration result = await fetchMgr.get(‘abc’);
The underlying JS Promise to Future mechanism will be exposed as a public API in a future checkin.
abstract class B { void m([int x = 3]); } class A implements B { noSuchMethod(Invocation i) { if (i.positionalArguments.length == 0) { print("No arguments passed"); } else { print("First argument is ${i.positionalArguments[0]}"); } } } void main() { A().m(); }
dart:core
NoSuchMethodError
constructor.dart:mirrors
MirrorsUsed
as deprecated. The mirrors library is no longer supported by dart2js, and MirrorsUsed
only affected dart2js.dart:io
X509Certificate.der
, X509Certificate.pem
, and X509Certificate.sha1
.FileSystemEntity.fromRawPath
constructor to allow for the creation of FileSystemEntity
using Uint8List
buffers.async
functions now start synchronously when previewing Dart 2 with --preview-dart-2
. Build tools (e.g., build_runner) may override the default and/or allow developers to configure. Passing the --no-sync-async
flag will produce the old behavior, starting async
functions asynchronously.cast
method to always change the type. Deprecated the retype
method and made it redirect to cast
. Applies to all of the following interfaces:Stream
:StreamTransformer
Iterable
Map
Several fixes to improve support for running output of dart2js as a webworker.
dart:isolate
implementation removed. To launch background tasks, please use webworkers instead. APIs for webworkers can be accessed from dart:html
or JS-interop.
dart:io
ZLibOptions
, FileMode
, FileLock
, FileSystemEntityType
, FileSystemEvent
, ProcessStartMode
, ProcessSignal
, InternetAddressType
, InternetAddress
, SocketDirection
, SocketOption
, RawSocketEvent
, and StdioType
, and deprecated the old SCREAMING_CAPS
constants.zlib
, gzip
, and systemEncoding
, and deprecated the old SCREAMING_CAPS
top-level constants.FileMode
constants READ
, WRITE
, APPEND
, WRITE_ONLY
, and WRITE_ONLY_APPEND
. Please use e.g. FileMode.read
instead.Failed as
casts on Iterable<T>
, Map<T>
, Future<T>
, and Stream<T>
are no longer ignored. These failures were ignored to make it easier to migrate Dart 1 code to strong mode, but ignoring them is a hole in the type system. This closes part of that hole. (We still need to stop ignoring “as” cast failures on function types, and implicit cast failures on the above types and function types.)
async
functions now start synchronously by default. Build tools (e.g., build_runner) may override the default and/or allow developers to configure.
build
and serve
commands will now fail and point users to https://webdev.dartlang.org/dart-2async
functions now start synchronously. This will be the default behavior across all tools. To temporarily opt-out, use the --no-sync-async
flag.pub_semver
issue 20).dart:core
tryParse
static method to int
, double
, num
, BigInt
, Uri
and DateTime
.onError
parameter on int.parse
, double.parse
and num.parse
.packages
specially. Previously they had ignored these directories - and their contents - from the point of view of analysis. Now they'll be treated just as regular directories. This special-casing of packages
directories was to support using symlinks for package: resolution; that functionality is now handled by .packages
files.dart:async
defaultValue
parameter on Stream.firstWhere
and Stream.lastWhere
.dart:collection
Maps
class. Extend MapBase
or mix in MapMixin
instead to provide map method implementations for a class.dart:html
query
and queryAll
use querySelector
and queryAllSelector
.Document
method getCSSCanvasContext
and property supportsCssCanvasContext
.Element
property xtag
no longer supported in browsers.ServiceWorker
class.MessageChannel
and MessagePort
addEventListener
automatically calls start
method to receive queued messages.dart:io
IOOverrides.socketConnect
.Fixed bug where dart2js crashed when invoked from pub build
and pub serve
when given files that contain non-ASCII characters (issue 32561).
Fixed --no-frequency-based-minification
, which was not working together with the common front-end (issue 32600).
Support --categories=Server
with the common front-end. This included also fixes for the constant value bool.fromEnvironment("*")
of “dart.libraries.io”, “dart.libraries.mirrors”, “dart.libraries.isolate”, and “dart.libraries.html”.
Pub will now automatically retry HTTP requests that fail with an IO error (issue 1826).
pub deps
now includes the SDK version. This makes the output more helpful when included in bug reports (issue 1827).
build
and serve
now print a deprecation warning pointing users to https://webdev.dartlang.org/dart-2 (issue 1823).
Not released, due to a failure in the pub tool.
The dart2js compiler now uses the common front-end by default. This is a step towards supporting Dart 2.0. At this time dart2js has no semantic changes: the Dart 2.0 strong-mode semantics are not enabled, so dart2js continues to support the Dart 1 type system. This change however lets us start supporting new syntactic features of Dart 2.0, like optional new/const. With this change you may notice:
small code differences (~1% code size): some code is generated slightly different, this is expected because the internal representation of the program has small differences between the old and new front end.
source-maps changes: with the new front-end, dart2js also is using a new mechanism to generate source-map files. We don't expect big differences here either, the new source-maps try to encode more data for locations that are commonly used during debugging.
some missing errors: the CFE is not complete and may not report some static errors that the old front-end did. This is temporary. If you run the analyzer on all your project already, you may never notice those missing error messages.
as announced earlier, this is the first version of dart2js that no longer supports dart:mirrors
.
this is the first version of dart2js that no longer supports --package-root
, which long ago was deprecated in favor of --packages
.
dart:core
whereType
method until generic methods are enabled on all platforms (issue 32463).UriData.dataAsBytes
to Uint8List
.dart:convert
jsonEncode
, jsonDecode
, base64Encode
, base64UrlEncode
and base64Decode
top-level functions.encode
on AsciiCodec
and Latin1Codec
, and convert
on AsciiEncoder
, Latin1Encoder
, to Uint8List
.part of
declaration may now be used to refer to the library this file is part of. A library part can now declare its library either as: part of name.of.library;
or as part of "uriReferenceOfLibrary.dart";
. This allows libraries with no library declarations (and therefore no name) to have parts, and it allows tools to easily find the library of a part file.async
functions synchronously. All tools (VM, dart2js, DDC) have now a flag --sync-async
to enable this behavior. Currently this behavior is opt-in. It will become the default.void
is now a Top type like dynamic
, and Object
. It also now has new errors for being used where not allowed (such as being assigned to any non-void
-typed parameter). Some libraries (importantly, mockito) may need to be updated to accept void values to keep their APIs working.Future flattening is now done only as specified in the Dart 2.0 spec, rather than more broadly. This means that the following code will now have an error on the assignment to y
.
test() { Future<int> f; var x = f.then<Future<List<int>>>((x) => []); Future<List<int>> y = x; }
dart:async
Stream
:cast
, castFrom
, and retype
.firstWhere
, lastWhere
, and singleWhere
to return Future<T>
and added an optional T orElse()
callback.StreamTransformer
: added cast
, castFrom
, retype
.StreamTransformerBase
: new class.Timer
: added tick
property.Zone
bindBinaryCallbackGuarded
, bindCallbackGuarded
, and bindUnaryCallbackGuarded
.Zone.ROOT
to Zone.root
.dart:cli
New “provisional” library for CLI-specific features.
waitFor
: function that suspends a stack to wait for a Future
to complete.
dart:collection
MapBase
: added mapToString
.LinkedHashMap
no longer implements HashMap
LinkedHashSet
no longer implements HashSet
.of
constructor to Queue
, ListQueue
, DoubleLinkedQueue
, HashSet
, LinkedHashSet
, SplayTreeSet
, Map
, HashMap
, LinkedHashMap
, SplayTreeMap
.dart:convert
Base64Codec.decode
return type is now Uint8List
.JsonUnsupportedObjectError
: added partialResult
propertyLineSplitter
now implements StreamTransformer<String, String>
instead of Converter
. It retains Converter
methods convert
and startChunkedConversion
.Utf8Decoder
when compiled with dart2js uses the browser's TextDecoder
in some common cases for faster decoding.ASCII
, BASE64
, BASE64URI
, JSON
, LATIN1
and UTF8
to ascii
, base64
, base64Uri
, json
, latin1
and utf8
.HtmlEscapeMode
constants UNKNOWN
, ATTRIBUTE
, SQ_ATTRIBUTE
and ELEMENT
to unknown
, attribute
, sqAttribute
and elements
.dart:core
BigInt
class added to support integers greater than 64-bits.proxy
annotation.Provisional
class and provisional
field.pragma
annotation.RegExp
added static escape
function.Uri
class now correctly handles paths while running on Node.js on Windows.Iterable
added members cast
, castFrom
, followedBy
, retype
and whereType
.Iterable.singleWhere
added orElse
parameter.List
added +
operator, first
and last
setters, and indexWhere
and lastIndexWhere
methods, and static copyRange
and writeIterable
methods.Map
added fromEntries
constructor.Map
added addEntries
, cast
, entries
, map
, removeWhere
, retype
, update
and updateAll
members.MapEntry
: new class used by Map.entries
.IterableBase
, ListBase
, SetBase
or MapBase
(or uses the corresponding mixins) from dart:collection
, the new members are implemented automatically.of
constructor to List
, Set
, Map
.double.INFINITY
, double.NEGATIVE_INFINITY
, double.NAN
, double.MAX_FINITE
and double.MIN_POSITIVE
to double.infinity
, double.negativeInfinity
, double.nan
, double.maxFinite
and double.minPositive
.DateTime
to lower case: MONDAY
through SUNDAY
, DAYS_PER_WEEK
(as daysPerWeek
), JANUARY
through DECEMBER
and MONTHS_PER_YEAR
(as monthsPerYear
).Duration
to lower case: MICROSECONDS_PER_MILLISECOND
to microsecondsPerMillisecond
, MILLISECONDS_PER_SECOND
to millisecondsPerSecond
, SECONDS_PER_MINUTE
to secondsPerMinute
, MINUTES_PER_HOUR
to minutesPerHour
, HOURS_PER_DAY
to hoursPerDay
, MICROSECONDS_PER_SECOND
to microsecondsPerSecond
, MICROSECONDS_PER_MINUTE
to microsecondsPerMinute
, MICROSECONDS_PER_HOUR
to microsecondsPerHour
, MICROSECONDS_PER_DAY
to microsecondsPerDay
, MILLISECONDS_PER_MINUTE
to millisecondsPerMinute
, MILLISECONDS_PER_HOUR
to millisecondsPerHour
, MILLISECONDS_PER_DAY
to millisecondsPerDay
, SECONDS_PER_HOUR
to secondsPerHour
, SECONDS_PER_DAY
to secondsPerDay
, MINUTES_PER_DAY
to minutesPerDay
, and ZERO
to zero
.typeArguments
to Invocation
class.Invocation
objects directly, without going through noSuchMethod
.unaryMinus
and empty
constant symbols on the Symbol
class.dart:developer
Flow
class added.Timeline.startSync
and Timeline.timeSync
now accept an optional parameter flow
of type Flow
. The flow
parameter is used to generate flow timeline events that are enclosed by the slice described by Timeline.{start,finish}Sync
and Timeline.timeSync
.dart:io
HttpStatus
added UPGRADE_REQUIRED
.IOOverrides
and HttpOverrides
added to aid in writing tests that wish to mock varios dart:io
objects.Platform.operatingSystemVersion
added that gives a platform-specific String describing the version of the operating system.ProcessStartMode.INHERIT_STDIO
added, which allows a child process to inherit the parent's stdio handles.RawZLibFilter
added for low-level access to compression and decompression routines.SecureSocket
, SecurityContext
, and X509Certificate
to be consistent across all platforms. All SecureSocket
, SecurityContext
, and X509Certificate
properties and methods are now supported on iOS and OSX.SecurityContext.alpnSupported
deprecated as ALPN is now supported on all platforms.SecurityContext
: added withTrustedRoots
named optional parameter constructor, which defaults to false.timeout
parameter to Socket.connect
, RawSocket.connect
, SecureSocket.connect
and RawSecureSocket.connect
. If a connection attempt takes longer than the duration specified in timeout
, a SocketException
will be thrown. Note: if the duration specified in timeout
is greater than the OS level timeout, a timeout may occur sooner than specified in timeout
.Stdin.hasTerminal
added, which is true if stdin is attached to a terminal.WebSocket
added static userAgent
property.RandomAccessFile.close
returns Future<void>
dart:isolate
Isolate.spawn
take a type parameter representing the argument type of the provided function. This allows functions with arguments types other than Object
in strong mode.IMMEDIATE
and BEFORE_NEXT_EVENT
on Isolate
to immediate
and beforeNextEvent
.dart.math
E
, LN10
, LN
, LOG2E
, LOG10E
, PI
, SQRT1_2
and SQRT2
to e
, ln10
, ln
, log2e
, log10e
, pi
, sqrt1_2
and sqrt2
.dart.mirrors
IsolateMirror.loadUri
, which allows dynamically loading additional code.dart:typed_data
Unmodifiable
view classes over all List
types.BYTES_PER_ELEMENT
to bytesPerElement
on all typed data lists.XXXX
through WWWW
on Float32x4
and Int32x4
to lower-case xxxx
through wwww
.Endinanness
to Endian
and its constants from BIG_ENDIAN
, LITTLE_ENDIAN
and HOST_ENDIAN
to little
, big
and host
.Support for MIPS has been removed.
Dart int
is now restricted to 64 bits. On overflow, arithmetic operations wrap around, and integer literals larger than 64 bits are not allowed. See https://github.com/dart-lang/sdk/blob/master/docs/language/informal/int64.md for details.
The analyzer will no longer issue a warning when a generic type parameter is used as the type in an instance check. For example:
test<T>() { print(3 is T); // No warning }
New static checking of @visibleForTesting
elements. Accessing a method, function, class, etc. annotated with @visibleForTesting
from a file not in a test/
directory will result in a new hint (issue 28273).
Static analysis now respects functions annotated with @alwaysThrows
(issue 31384).
New hints added:
NULL_AWARE_BEFORE_OPERATOR
when an operator is used after a null-aware access. For example:
x?.a - ''; // HINT
NULL_AWARE_IN_LOGICAL_OPERATOR
when an expression with null-aware access is used as a condition in logical operators. For example:
x.a || x?.b; // HINT
There is now a default SDK constraint of <2.0.0
for any package with no existing upper bound. This allows us to move more safely to 2.0.0. All new packages published on pub will now require an upper bound SDK constraint so future major releases of Dart don't destabilize the package ecosystem.
All SDK constraint exclusive upper bounds are now treated as though they allow pre-release versions of that upper bound. For example, the SDK constraint >=1.8.0 <2.0.0
now allows pre-release SDK versions such as 2.0.0-beta.3.0
. This allows early adopters to try out packages that don't explicitly declare support for the new version yet. You can disable this functionality by setting the PUB_ALLOW_PRERELEASE_SDK
environment variable to false
.
Git dependencies may now include a path
parameter, indicating that the package exists in a subdirectory of the Git repository. For example:
dependencies: foobar: git: url: git://github.com/dart-lang/multi_package_repo path: pkg/foobar
Added an --executables
option to pub deps
command. This will list all available executables that can be run with pub run
.
Added a PUB_MAX_WORKERS_PER_TASK
environment variable which can be set to configure the number of dartdevc/analyzer workers that are used when compiling with --web-compiler=dartdevc
.
The Flutter sdk
source will now look for packages in flutter/bin/cache/pkg/
as well as flutter/packages/
. In particular, this means that packages can depend on the sky_engine
package from the sdk
source (issue 1775).
Pub will now automatically retry HTTP requests that fail with a 502, 503, of 504 error code (issue 1556).
Pub now caches compiled packages and snapshots in the .dart_tool/pub
directory, rather than the .pub
directory (issue 1795).
Emit exit code 66 when a path dependency doesn't exist (issue 1747).
pub publish
throws a more explicit error if the publish_to
field isn't an absolute URL (issue 1769).
pub publish
provides more detailed information if the package is too large to upload.
Added a --build-delay
argument to pub serve
which sets the amount of time (in ms) to wait between file watcher events before scheduling a build. Defaults to 50.
pub get
and pub upgrade
properly produce an error message and exit code when no network is present.
pub serve
now waits for file watcher events to stabilize before scheduling new builds. This helps specifically with safe-write
features in editors, as well as other situations such as save all
which cause many fast edits.
Removed the require.js module loading timeout for dartdevc, which resolves an issue where the initial load of an app might give a timeout error.
Root package analysis options are no longer enforced for dependencies when compiling with dartdevc (issue 1684).
Dart scripts can be included from subdirectories with dartdevc (issue 30246).
The barback
infrastructure now supports async
2.0.0.
Print a more informative error message when the Flutter SDK isn't available (issue 1719).
Don't crash when publishing a package that contains an empty submodule (issue 1679).
Emit exit code 69 for TLS errors (issue 1729).
Fix pub global run
for packages activated from a local path that also have relative path dependencies (issue 1751).
pub build
and pub serve
support using the common front-end in the dart2js transformer.
dartfmt
Dart Dev Compiler
is
checks that return a different result in weak mode (SDK issue 28988). For example:main() { List l = []; // Prints "false", does not throw. print(l is List<String>); }
dart:io
SecureSocket
, SecurityContext
, and X509Certificate
to be consistent across all platforms. All SecureSocket
, SecurityContext
, and X509Certificate
properties and methods are now supported on iOS and OSX.pub serve
.During a dynamic type check, void
is not required to be null
anymore. In practice, this makes overriding void
functions with non-void
functions safer.
During static analysis, a function or setter declared using =>
with return type void
now allows the returned expression to have any type. For example, assuming the declaration int x;
, it is now type correct to have void f() => ++x;
.
A new function-type syntax has been added to the language. Warning: In Dart 1.24, this feature is incomplete, and not stable in the Analyzer.
Intuitively, the type of a function can be constructed by textually replacing the function's name with Function
in its declaration. For instance, the type of void foo() {}
would be void Function()
. The new syntax may be used wherever a type can be written. It is thus now possible to declare fields containing functions without needing to write typedefs: void Function() x;
. The new function type has one restriction: it may not contain the old-style function-type syntax for its parameters. The following is thus illegal: void Function(int f())
. typedefs
have been updated to support this new syntax.
Examples:
typedef F = void Function(); // F is the name for a `void` callback. int Function(int) f; // A field `f` that contains an int->int function. class A<T> { // The parameter `callback` is a function that takes a `T` and returns // `void`. void forEach(void Function(T) callback); } // The new function type supports generic arguments. typedef Invoker = T Function<T>(T Function() callback);
dart:async
, dart:core
, dart:io
IOSink
, is no longer not allowed. In 1.24, violations are only reported (on stdout or stderr), but a future version of the Dart SDK will change this to throwing a StateError
.dart:convert
ChunkedConverter
class.Map<String, dynamic>
instead of Map<dynamic, dynamic>
. A JSON-map is not a HashMap
or LinkedHashMap
anymore (but just a Map
).dart:io
Platform.localeName
, needed for accessing the locale on platforms that don't store it in an environment variable.ProcessInfo.currentRss
and ProcessInfo.maxRss
for inspecting the Dart VM process current and peak resident set size.RawSynchronousSocket
, a basic synchronous socket implementation.dart:
web APIs have been updated to align with Chrome v50. This change includes a large number of changes, many of which are breaking. In some cases, new class names may conflict with names that exist in existing code.
dart:html
REMOVED classes: Bluetooth
, BluetoothDevice
, BluetoothGattCharacteristic
, BluetoothGattRemoteServer
, BluetoothGattService
, BluetoothUuid
, CrossOriginConnectEvent
, DefaultSessionStartEvent
, DomSettableTokenList
, MediaKeyError
, PeriodicSyncEvent
, PluginPlaceholderElement
, ReadableStream
, StashedMessagePort
, SyncRegistration
REMOVED members:
texImage2DCanvas
was removed from RenderingContext
.endClip
and startClip
were removed from Animation
.after
and before
were removed from CharacterData
, ChildNode
and Element
.keyLocation
was removed from KeyboardEvent
. Use location
instead.generateKeyRequest
, keyAddedEvent
, keyErrorEvent
, keyMessageEvent
, mediaGroup
, needKeyEvent
, onKeyAdded
, onKeyError
, onKeyMessage
, and onNeedKey
were removed from MediaElement
.getStorageUpdates
was removed from Navigator
status
was removed from PermissionStatus
getAvailability
was removed from PreElement
Other behavior changes:
url("http://google.com")
instead of url(http://google.com)
.int
to num
.num
instead of whole numbers).setRangeText
with a selectionMode
value of ‘invalid’ is no longer valid. Only “select”, “start”, “end”, “preserve” are allowed.dart:svg
dart:svg
carefully.dart:web_audio
AudioContext
– createIirFilter
returns a new class IirFilterNode
.dart:web_gl
new classes: CompressedTextureAstc
, ExtColorBufferFloat
, ExtDisjointTimerQuery
, and TimerQueryExt
.
ExtFragDepth
added: readPixels2
and texImage2D2
.
Removed ad hoc Future.then
inference in favor of using FutureOr
. Prior to adding FutureOr
to the language, the analyzer implented an ad hoc type inference for Future.then
(and overrides) treating it as if the onValue callback was typed to return FutureOr
for the purposes of inference. This ad hoc inference has been removed now that FutureOr
has been added.
Packages that implement Future
must either type the onValue
parameter to .then
as returning FutureOr<T>
, or else must leave the type of the parameter entirely to allow inference to fill in the type.
During static analysis, a function or setter declared using =>
with return type void
now allows the returned expression to have any type.
Dartium
Dartium is now based on Chrome v50. See Core library changes above for details on the changed APIs.
Pub
pub build
and pub serve
Added support for the Dart Development Compiler.
Unlike dart2js, this new compiler is modular, which allows pub to do incremental re-builds for pub serve
, and potentially pub build
in the future.
In practice what that means is you can edit your Dart files, refresh in Chrome (or other supported browsers), and see your edits almost immediately. This is because pub is only recompiling your package, not all packages that you depend on.
There is one caveat with the new compiler, which is that your package and your dependencies must all be strong mode clean. If you are getting an error compiling one of your dependencies, you will need to file bugs or send pull requests to get them strong mode clean.
There are two ways of opting into the new compiler:
Use the new --web-compiler
flag, which supports dartdevc
, dart2js
or none
as options. This is the easiest way to try things out without changing the default.
Add config to your pubspec. There is a new web
key which supports a single key called compiler
. This is a map from mode names to compiler to use. For example, to default to dartdevc in debug mode you can add the following to your pubspec:
web: compiler: debug: dartdevc
You can also use the new compiler to run your tests in Chrome much more quickly than you can with dart2js. In order to do that, run pub serve test --web-compiler=dartdevc
, and then run pub run test -p chrome --pub-serve=8080
.
The --no-dart2js
flag has been deprecated in favor of --web-compiler=none
.
pub build
will use a failing exit code if there are errors in any transformer.
pub publish
Added support for the UNLICENSE file.
Packages that depend on the Flutter SDK may be published.
pub get
and pub upgrade
dartfmt
lib1.dart:
class A { int _x; } class B { int _x; }
lib2.dart:
import 'lib1.dart'; class C extends A with B {}
error • The private name _x, defined by B, conflicts with the same name defined by A at tmp/lib2.dart:3:24 • private_collision_in_mixin_application
Breaking change - strong mode will prefer the expected type to infer generic types, functions, and methods (SDK issue 27586).
main() { List<Object> foo = /*infers: <Object>*/['hello', 'world']; var bar = /*infers: <String>*/['hello', 'world']; }
Strong mode inference error messages are improved (SDK issue 29108).
import 'dart:math'; test(Iterable/* fix is to add <num> here */ values) { num n = values.fold(values.first as num, max); }
Now produces the error on the generic function “max”:
Couldn't infer type parameter 'T'. Tried to infer 'dynamic' for 'T' which doesn't work: Function type declared as '<T extends num>(T, T) → T' used where '(num, dynamic) → num' is required. Consider passing explicit type argument(s) to the generic.
Strong mode supports overriding fields, @virtual
is no longer required (SDK issue 28120).
class C { int x = 42; } class D extends C { get x { print("x got called"); return super.x; } } main() { print(new D().x); }
Strong mode down cast composite warnings are no longer issued by default. (SDK issue 28588).
void test() { List untyped = []; List<int> typed = untyped; // No down cast composite warning }
To opt back into the warnings, add the following to the .analysis_options file for your project.
analyzer: errors: strong_mode_down_cast_composite: warning
dart:core
Uri.isScheme
function to check the scheme of a URI. Example: uri.isScheme("http")
. Ignores case when comparing.UriData.parse
validate its input better. If the data is base-64 encoded, the data is normalized wrt. alphabet and padding, and it contains invalid base-64 data, parsing fails. Also normalizes non-base-64 data.dart:io
File.lastAccessed
, File.lastAccessedSync
, File.setLastModified
, File.setLastModifiedSync
, File.setLastAccessed
, and File.setLastAccessedSync
.{Stdin,Stdout}.supportsAnsiEscapes
.print()
and Stdout.write*()
now correctly print unicode characters to the console on Windows. Calls to Stdout.add*()
behave as before.Analysis
dartanalyzer
now follows the same rules as the analysis server to find an analysis options file, stopping when an analysis options file is found:package:flutter
.package:dart.analysis_options/default.yaml
if it exists.dartanalyzer
:--options
and that file will be used instead of searching for an analysis options file.--strong
or --no-strong
) takes precedence over any corresponding value specified in the analysis options file.Dartium, dart2js, and DDC
dart:io
are allowed, but the imported library is not supported and will likely fail on most APIs at runtime. This change was made as a stopgap measure to make it easier to write libraries that share code between platforms (like package http
). This might change again when configuration specific imports are supported.Pub
pub.dartlang.org
to allow better understanding of why a particular package is being accessed.pub publish
lib/
or bin/
, or a package that’s not a dev dependency from within benchmark/
, example/
, test/
or tool/
.pub get
and pub upgrade
dartfmt
-
and --
. Code that does this is pathological, but it technically meant dartfmt could change the semantics of the code.Patch release, resolves two issues:
Dart VM crash: Issue 28072
Dart VM bug combining types, await, and deferred loading: Issue 28678
Breaking change: ‘Generalized tear-offs’ are no longer supported, and will cause errors. We updated the language spec and added warnings in 1.21, and are now taking the last step to fully de-support them. They were previously only supported in the VM, and there are almost no known uses of them in the wild.
The assert()
statement has been expanded to support an optional second message
argument (SDK issue 27342).
The message is displayed if the assert fails. It can be any object, and it is accessible as AssertionError.message
. It can be used to provide more user friendly exception outputs. As an example, the following assert:
assert(configFile != null, "Tool config missing. Please see https://goo.gl/k8iAi for details.");
would produce the following exception output:
Unhandled exception: 'file:///Users/mit/tmp/tool/bin/main.dart': Failed assertion: line 9 pos 10: 'configFile != null': Tool config missing. Please see https://goo.gl/k8iAi for details. #0 _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:33) #1 _AssertionError._throwNew (dart:core-patch/errors_patch.dart:29) #2 main (file:///Users/mit/tmp/tool/bin/main.dart:9:10)
The Null
type has been moved to the bottom of the type hierarchy. As such, it is considered a subtype of every other type. The null
literal was always treated as a bottom type. Now the named class Null
is too:
const empty = <Null>[]; String concatenate(List<String> parts) => parts.join(); int sum(List<int> numbers) => numbers.fold(0, (sum, n) => sum + n); concatenate(empty); // OK. sum(empty); // OK.
Introduce covariant
modifier on parameters. It indicates that the parameter (and the corresponding parameter in any method that overrides it) has looser override rules. In strong mode, these require a runtime type check to maintain soundness, but enable an architectural pattern that is useful in some code.
It lets you specialize a family of classes together, like so:
abstract class Predator { void chaseAndEat(covariant Prey p); } abstract class Prey {} class Mouse extends Prey {} class Seal extends Prey {} class Cat extends Predator { void chaseAndEat(Mouse m) => ... } class Orca extends Predator { void chaseAndEat(Seal s) => ... }
This isn't statically safe, because you could do:
Predator predator = new Cat(); // Upcast. predator.chaseAndEat(new Seal()); // Cats can't eat seals!
To preserve soundness in strong mode, in the body of a method that uses a covariant override (here, Cat.chaseAndEat()
), the compiler automatically inserts a check that the parameter is of the expected type. So the compiler gives you something like:
class Cat extends Predator { void chaseAndEat(o) { var m = o as Mouse; ... } }
Spec mode allows this unsound behavior on all parameters, even though users rarely rely on it. Strong mode disallowed it initially. Now, strong mode lets you opt into this behavior in the places where you do want it by using this modifier. Outside of strong mode, the modifier is ignored.
Change instantiate-to-bounds rules for generic type parameters when running in strong mode. If you leave off the type parameters from a generic type, we need to decide what to fill them in with. Dart 1.0 says just use dynamic
, but that isn't sound:
class Abser<T extends num> { void absThis(T n) { n.abs(); } } var a = new Abser(); // Abser<dynamic>. a.absThis("not a num");
We want the body of absThis()
to be able to safely assume n
is at least a num
-- that‘s why there’s a constraint on T, after all. Implicitly using dynamic
as the type parameter in this example breaks that.
Instead, strong mode uses the bound. In the above example, it fills it in with num
, and then the second line where a string is passed becomes a static error.
However, there are some cases where it is hard to figure out what that default bound should be:
class RuhRoh<T extends Comparable<T>> {}
Strong mode‘s initial behavior sometimes produced surprising, unintended results. For 1.22, we take a simpler approach and then report an error if a good default type argument can’t be found.
Define FutureOr<T>
for code that works with either a future or an immediate value of some type. For example, say you do a lot of text manipulation, and you want a handy function to chain a bunch of them:
typedef String StringSwizzler(String input); String swizzle(String input, List<StringSwizzler> swizzlers) { var result = input; for (var swizzler in swizzlers) { result = swizzler(result); } return result; }
This works fine:
main() { var result = swizzle("input", [ (s) => s.toUpperCase(), (s) => () => s * 2) ]); print(result); // "INPUTINPUT". }
Later, you realize you'd also like to support swizzlers that are asynchronous (maybe they look up synonyms for words online). You could make your API strictly asynchronous, but then users of simple synchronous swizzlers have to manually wrap the return value in a Future.value()
. Ideally, your swizzle()
function would be “polymorphic over asynchrony”. It would allow both synchronous and asynchronous swizzlers. Because await
accepts immediate values, it is easy to implement this dynamically:
Future<String> swizzle(String input, List<StringSwizzler> swizzlers) async { var result = input; for (var swizzler in swizzlers) { result = await swizzler(result); } return result; } main() async { var result = swizzle("input", [ (s) => s.toUpperCase(), (s) => new Future.delayed(new Duration(milliseconds: 40), () => s * 2) ]); print(await result); }
What should the declared return type on StringSwizzler be? In the past, you had to use dynamic
or Object
, but that doesn't tell the user much. Now, you can do:
typedef FutureOr<String> StringSwizzler(String input);
Like the name implies, FutureOr<String>
is a union type. It can be a String
or a Future<String>
, but not anything else. In this case, that's not super useful beyond just stating a more precise type for readers of the code. It does give you a little better error checking in code that uses the result of that.
FutureOr<T>
becomes really important in generic methods like Future.then()
. In those cases, having the type system understand this magical union type helps type inference figure out the type argument of then()
based on the closure you pass it.
Previously, strong mode had hard-coded rules for handling Future.then()
specifically. FutureOr<T>
exposes that functionality so third-party APIs can take advantage of it too.
Dart2Js
Pub
Avoid using a barback asset server for executables unless they actually use transformers. This makes precompilation substantially faster, produces better error messages when precompilation fails, and allows globally-activated executables to consistently use the Isolate.resolvePackageUri()
API.
On Linux systems, always ignore packages' original file owners and permissions when extracting those packages. This was already the default under most circumstances.
Properly close the standard input stream of child processes started using pub run
.
Handle parse errors from the package cache more gracefully. A package whose pubspec can't be parsed will now be ignored by pub get --offline
and deleted by pub cache repair
.
Make pub run
run executables in spawned isolates. This lets them handle signals and use standard IO reliably.
Fix source-maps produced by dart2js when running in pub serve
: URL references to assets from packages match the location where pub serve
serves them (packages/package_name/
instead of ../packages/package_name/
).
tools/gn.py
. This change is in response to the deprecation of gyp. Build file generation with gyp will continue to be available in this release by setting the environment variable DART_USE_GYP
before running gclient sync
or gclient runhooks
, but this will be removed in a future release.Patch release, resolves one issue:
Support generic method syntax. Type arguments are not available at runtime. For details, check the informal specification.
Support access to initializing formals, e.g., the use of x
to initialize y
in class C { var x, y; C(this.x): y = x; }
. Please check the informal specification for details.
Don't warn about switch case fallthrough if the case ends in a rethrow
statement. (SDK issue 27650)
Also don't warn if the entire switch case is wrapped in braces - as long as the block ends with a break
, continue
, rethrow
, return
or throw
.
Allow =
as well as :
as separator for named parameter default values.
enableFlags({bool hidden: false}) { … }
can now be replaced by
enableFlags({bool hidden = false}) { … }
(SDK issue 27559)
dart:core
: Set.difference
now takes a Set<Object>
as argument. (SDK issue 27573)
dart:developer
Service
class.Isolate
.Dart Dev Compiler
loadLibrary()
on deferred libraries. Deferred libraries are still loaded eagerly. (SDK issue 27343)Patch release, resolves one issue:
It is no longer a warning when casting from dynamic to a composite type (SDK issue 27766).
main() { dynamic obj = <int>[1, 2, 3]; // This is now allowed without a warning. List<int> list = obj; }
We have improved the way that the VM locates the native code library for a native extension (e.g. dart-ext:
import). We have updated this article on native extensions to reflect the VM's improved behavior.
Linux builds of the VM will now use the tcmalloc
library for memory allocation. This has the advantages of better debugging and profiling support and faster small allocations, with the cost of slightly larger initial memory footprint, and slightly slower large allocations.
We have improved the way the VM searches for trusted root certificates for secure socket connections on Linux. First, the VM will look for trusted root certificates in standard locations on the file system (/etc/pki/tls/certs/ca-bundle.crt
followed by /etc/ssl/certs
), and only if these do not exist will it fall back on the builtin trusted root certificates. This behavior can be overridden on Linux with the new flags --root-certs-file
and --root-certs-cache
. The former is the path to a file containing the trusted root certificates, and the latter is the path to a directory containing root certificate files hashed using c_rehash
.
The VM now throws a catchable Error
when method compilation fails. This allows easier debugging of syntax errors, especially when testing. (SDK issue 23684)
dart:core
: Remove deprecated Resource
class. Use the class in package:resource
instead.dart:async
Future.wait
now catches synchronous errors and returns them in the returned Future. (SDK issue 27249)Future
on Stream.cancel
operations. Discourages to return null
from cancel
. (SDK issue 26777)dart:io
WebSocket.addUtf8Text
to allow sending a pre-encoded text message without a round-trip UTF-8 conversion. (SDK issue 27129)Breaking change - it is an error if a generic type parameter cannot be inferred (SDK issue 26992).
class Cup<T> { Cup(T t); } main() { // Error because: // - if we choose Cup<num> it is not assignable to `cOfInt`, // - if we choose Cup<int> then `n` is not assignable to int. num n; C<int> cOfInt = new C(n); }
New feature - use @checked
to override a method and tighten a parameter type (SDK issue 25578).
import 'package:meta/meta.dart' show checked; class View { addChild(View v) {} } class MyView extends View { // this override is legal, it will check at runtime if we actually // got a MyView. addChild(@checked MyView v) {} } main() { dynamic mv = new MyView(); mv.addChild(new View()); // runtime error }
New feature - use @virtual
to allow field overrides in strong mode (SDK issue 27384).
import 'package:meta/meta.dart' show virtual; class Base { @virtual int x; } class Derived extends Base { int x; // Expose the hidden storage slot: int get superX => super.x; set superX(int v) { super.x = v; } }
Breaking change - infer list and map literals from the context type as well as their values, consistent with generic methods and instance creation (SDK issue 27151).
import 'dart:async'; main() async { var b = new Future<B>.value(new B()); var c = new Future<C>.value(new C()); var/*infer List<Future<A>>*/ list = [b, c]; var/*infer List<A>*/ result = await Future.wait(list); } class A {} class B extends A {} class C extends A {}
dartfmt
- upgraded to v0.2.10
--set-exit-if-changed
to set the exit code on a change.Pub
packages/
directory by default. Instead, it generates a .packages
file, called a package spec. To generate a packages/
directory in addition to the package spec, use the --packages-dir
flag with pub get
, pub upgrade
, and pub downgrade
. See the Good-bye symlinks article for details.Patch release, resolves one issue:
dartfmt
- upgraded to v0.2.9+1
Pub
Added a --no-packages-dir
flag to pub get
, pub upgrade
, and pub downgrade
. When this flag is passed, pub will not generate a packages/
directory, and will remove that directory and any symlinks to it if they exist. Note that this replaces the unsupported --no-package-symlinks
flag.
Added the ability for packages to declare a constraint on the Flutter SDK:
environment: flutter: ^0.1.2 sdk: >=1.19.0 <2.0.0
A Flutter constraint will only be satisfiable when pub is running in the context of the flutter
executable, and when the Flutter SDK version matches the constraint.
Added sdk
as a new package source that fetches packages from a hard-coded SDK. Currently only the flutter
SDK is supported:
dependencies: flutter_driver: sdk: flutter version: ^0.0.1
A Flutter sdk
dependency will only be satisfiable when pub is running in the context of the flutter
executable, and when the Flutter SDK contains a package with the given name whose version matches the constraint.
tar
files on Linux are now created with 0
as the user and group IDs. This fixes a crash when publishing packages while using Active Directory.
Fixed a bug where packages from a hosted HTTP URL were considered the same as packages from an otherwise-identical HTTPS URL.
Fixed timer formatting for timers that lasted longer than a minute.
Eliminate some false negatives when determining whether global executables are on the user's executable path.
dart2js
dart2dart
(aka dart2js --output-type=dart
) has been removed (this was deprecated in Dart 1.11).New feature - an option to disable implicit casts (SDK issue 26583), see the documentation for usage instructions and examples.
New feature - an option to disable implicit dynamic (SDK issue 25573), see the documentation for usage instructions and examples.
Breaking change - infer generic type arguments from the constructor invocation arguments (SDK issue 25220).
var map = new Map<String, String>(); // infer: Map<String, String> var otherMap = new Map.from(map);
Breaking change - infer local function return type (SDK issue 26414).
void main() { // infer: return type is int f() { return 40; } int y = f() + 2; // type checks print(y); }
Breaking change - allow type promotion from a generic type parameter (SDK issue 26414).
void fn/*<T>*/(/*=T*/ object) { if (object is String) { // Treat `object` as `String` inside this block. // But it will require a cast to pass it to something that expects `T`. print(object.substring(1)); } }
Breaking change - smarter inference for Future.then (SDK issue 25944). Previous workarounds that use async/await or .then/*<Future<SomeType>>*/
should no longer be necessary.
// This will now infer correctly. Future<List<int>> t2 = f.then((_) => [3]); // This infers too. Future<int> t2 = f.then((_) => new Future.value(42));
Breaking change - smarter inference for async functions (SDK issue 25322).
void test() async { List<int> x = await [4]; // was previously inferred List<int> y = await new Future.value([4]); // now inferred too }
Breaking change - sideways casts are no longer allowed (SDK issue 26120).
Patch release, resolves two issues and improves performance:
Debugger: Fixes a bug that crashes the VM (SDK issue 26941)
VM: Fixes an optimizer bug involving closures, try, and await (SDK issue 26948)
Dart2js: Speeds up generated code on Firefox (https://codereview.chromium.org/2180533002)
dart:core
Uri.resolve
(SDK issue 26804).dart:io
FileLock.BLOCKING_SHARED
and FileLock.BLOCKING_EXCLUSIVE
.Patch release, resolves two issues:
VM: Fixes a bug that caused crashes in async functions. (SDK issue 26668)
VM: Fixes a bug that caused garbage collection of reachable weak properties. (https://codereview.chromium.org/2041413005)
dart:convert
ChunkedConverter
which was erroneously added in 1.16.dart:core
Uri.replace
supports iterables as values for the query parameters.Uri.parseIPv6Address
returns a Uint8List
.dart:io
NetworkInterface.listSupported
, which is true
when NetworkInterface.list
is supported, and false
otherwise. Currently, NetworkInterface.list
is not supported on Android.Pub
TAR files created while publishing a package on Mac OS and Linux now use a more portable format.
Errors caused by invalid arguments now print the full usage information for the command.
SDK constraints for dependency overrides are no longer considered when determining the total SDK constraint for a lockfile.
A bug has been fixed in which a lockfile was considered up-to-date when it actually wasn't.
A bug has been fixed in which pub get --offline
would crash when a prerelease version was selected.
Dartium and content shell
Patch release, resolves one issue:
dart:convert
Added BASE64URL
codec and corresponding Base64Codec.urlSafe
constructor.
Introduce ChunkedConverter
and deprecate chunked methods on Converter
.
dart:html
There have been a number of BREAKING changes to align APIs with recent changes in Chrome. These include:
Chrome's ShadowRoot
interface no longer has the methods getElementById
, getElementsByClassName
, and getElementsByTagName
, e.g.,
elem.shadowRoot.getElementsByClassName('clazz')
should become:
elem.shadowRoot.querySelectorAll('.clazz')
The clipboardData
property has been removed from KeyEvent
and Event
. It has been moved to the new ClipboardEvent
class, which is now used by copy
, cut
, and paste
events.
The layer
property has been removed from KeyEvent
and UIEvent
. It has been moved to MouseEvent
.
The Point get page
property has been removed from UIEvent
. It still exists on MouseEvent
and Touch
.
There have also been a number of other additions and removals to dart:html
, dart:indexed_db
, dart:svg
, dart:web_audio
, and dart:web_gl
that correspond to changes to Chrome APIs between v39 and v45. Many of the breaking changes represent APIs that would have caused runtime exceptions when compiled to Javascript and run on recent Chrome releases.
dart:io
SecurityContext.alpnSupported
, which is true if a platform supports ALPN, and false otherwise.For performance reasons, a potentially BREAKING change was added for libraries that use JS interop. Any Dart file that uses @JS
annotations on declarations (top-level functions, classes or class members) to interop with JavaScript code will require that the file have the annotation @JS()
on a library directive.
@JS() library my_library;
The analyzer will enforce this by generating the error:
The @JS()
annotation can only be used if it is also declared on the library directive.
If part file uses the @JS()
annotation, the library that uses the part should have the @JS()
annotation e.g.,
// library_1.dart @JS() library library_1; import 'package:js/js.dart'; part 'part_1.dart';
// part_1.dart part of library_1; @JS("frameworkStabilizers") external List<FrameworkStabilizer> get frameworkStabilizers;
If your library already has a JS module e.g.,
@JS('array.utils') library my_library;
Then your library will work without any additional changes.
Static checking of for in
statements. These will now produce static warnings:
// Not Iterable. for (var i in 1234) { ... } // String cannot be assigned to int. for (int n in <String>["a", "b"]) { ... }
Pub
pub serve
now provides caching headers that should improve the performance of requesting large files multiple times.
Both pub get
and pub upgrade
now have a --no-precompile
flag that disables precompilation of executables and transformed dependencies.
pub publish
now resolves symlinks when publishing from a Git repository. This matches the behavior it always had when publishing a package that wasn't in a Git repository.
Dart Dev Compiler
The experimental dartdevc
executable has been added to the SDK.
It will help early adopters validate the implementation and provide feedback. dartdevc
is not yet ready for production usage.
Read more about the Dart Dev Compiler here.
dart:async
StreamView
class a const
class.dart:core
Uri.queryParametersAll
to handle multiple query parameters with the same name.dart:io
SecurityContext.usePrivateKeyBytes
, SecurityContext.useCertificateChainBytes
, SecurityContext.setTrustedCertificatesBytes
, and SecurityContext.setClientAuthoritiesBytes
.directory
argument of SecurityContext.setTrustedCertificates
has been removed.SecurityContext
for PKCS12 certificate and key containers.SecurityContext
that accept certificate data now accept an optional named parameter password
, similar to SecurityContext.usePrivateKeyBytes
, for use as the password for PKCS12 data.Dartium and content shell
dart:html
, dart:svg
, etc) have not been updated.Element.animate
.dartfmt
- upgraded to v0.2.4
extensionRPCs
in Isolate
was not marked optional.Added support for configuration-specific imports. On the VM and dart2js
, they can be enabled with --conditional-directives
.
The analyzer requires additional configuration:
analyzer: language: enableConditionalDirectives: true
Read about configuring the analyzer for more details.
Patch release, resolves three issues:
VM: Fixed a code generation bug on x64. (SDK commit 834b3f02)
dart:io
: Fixed EOF detection when reading some special device files. (SDK issue 25596)
Pub: Fixed an error using hosted dependencies in SDK version 1.14. (Pub issue 1386)
Patch release, resolves one issue:
dart:async
Future.any
static method.Stream.fromFutures
constructor.dart:convert
Base64Decoder.convert
now takes optional start
and end
parameters.dart:core
current
getter to StackTrace
class.Uri
class added support for data URIsdataFromBytes
and dataFromString
.data
getter for data:
URIs with a new UriData
class for the return type.growable
parameter to List.filled
constructor.DateTime
: DateTime.microsecond
, DateTime.microsecondsSinceEpoch
, and new DateTime.fromMicrosecondsSinceEpoch
.dart:math
Random
added a secure
constructor returning a cryptographically secure random generator which reads from the entropy source provided by the embedder for every generated random value.dart:io
Platform
added a static isIOS
getter and Platform.operatingSystem
may now return ios
.Platform
added a static packageConfig
getter.compression
on the methods WebSocket.connect
, WebSocket.fromUpgradedSocket
, and WebSocketTransformer.upgrade
and the WebSocketTransformer
constructor can be used to modify or disable compression using the new CompressionOptions
class.dart:isolate
packageConfig
and packageRoot
instance getters to Isolate
.resolvePackageUri
method to Isolate
.packageConfig
and automaticPackageResolution
to the Isolate.spawnUri
constructor.dartfmt
Better line splitting in a variety of cases.
Other optimizations and bug fixes.
Pub
Breaking: Pub now eagerly emits an error when a pubspec's “name” field is not a valid Dart identifier. Since packages with non-identifier names were never allowed to be published, and some of them already caused crashes when being written to a .packages
file, this is unlikely to break many people in practice.
Breaking: Support for barback
versions prior to 0.15.0 (released July 2014) has been dropped. Pub will no longer install these older barback versions.
pub serve
now GZIPs the assets it serves to make load times more similar to real-world use-cases.
pub deps
now supports a --no-dev
flag, which causes it to emit the dependency tree as it would be if no dev_dependencies
were in use. This makes it easier to see your package's dependency footprint as your users will experience it.
pub global run
now detects when a global executable's SDK constraint is no longer met and errors out, rather than trying to run the executable anyway.
Pub commands that check whether the lockfile is up-to-date (pub run
, pub deps
, pub serve
, and pub build
) now do additional verification. They ensure that any path dependencies' pubspecs haven't been changed, and they ensure that the current SDK version is compatible with all dependencies.
Fixed a crashing bug when using pub global run
on a global script that didn't exist.
Fixed a crashing bug when a pubspec contains a dependency without a source declared.
Patch release, resolves one issue:
Patch release, resolves three issues:
VM type propagation fix: Resolves a potential crash in the Dart VM (SDK commit [dff13be] (https://github.com/dart-lang/sdk/commit/dff13bef8de104d33b04820136da2d80f3c835d7))
dart2js crash fix: Resolves a crash in pkg/js and dart2js (SDK issue [24974] (https://github.com/dart-lang/sdk/issues/24974))
Pub get crash on ARM: Fixes a crash triggered when running ‘pub get’ on ARM processors such as those on a Raspberry Pi (SDK issue [24855] (https://github.com/dart-lang/sdk/issues/24855))
dart:async
StreamController
added getters for onListen
, onPause
, and onResume
with the corresponding new typedef void ControllerCallback()
.StreamController
added a getter for onCancel
with the corresponding new typedef ControllerCancelCallback()
;StreamTransformer
instances created with fromHandlers
with no handleError
callback now forward stack traces along with errors to the resulting streams.dart:convert
Base64Codec
, Base64Encoder
, and Base64Decoder
.const Base64Codec BASE64
.dart:core
Uri
added removeFragment
method.String.allMatches
(implementing Pattern.allMatches
) is now lazy, as all allMatches
implementations are intended to be.Resource
is deprecated, and will be removed in a future release.dart:developer
Timeline
class for interacting with Observatory's timeline feature.ServiceExtensionHandler
, ServiceExtensionResponse
, and registerExtension
which enable developers to provide their own VM service protocol extensions.dart:html
, dart:indexed_db
, dart:svg
, dart:web_audio
, dart:web_gl
, dart:web_sql
double
to num
. Dartium is now using JS interop for most operations. JS does not distinguish between numeric types, and will return a number as an int if it fits in an int. This will mostly cause an error if you assign to something typed double
in checked mode. You may need to insert a toDouble()
call or accept num
. Examples of APIs that are affected include Element.getBoundingClientRect
and TextMetrics.width
.dart:io
Breaking: Secure networking has changed, replacing the NSS library with the BoringSSL library. SecureSocket
, SecureServerSocket
, RawSecureSocket
,RawSecureServerSocket
, HttpClient
, and HttpServer
now all use a SecurityContext
object which contains the certificates and keys used for secure TLS (SSL) networking.
This is a breaking change for server applications and for some client applications. Certificates and keys are loaded into the SecurityContext
from PEM files, instead of from an NSS certificate database. Information about how to change applications that use secure networking is at https://www.dartlang.org/server/tls-ssl.html
HttpClient
no longer sends URI fragments in the request. This is not allowed by the HTTP protocol. The HttpServer
still gracefully receives fragments, but discards them before delivering the request.
To allow connections to be accepted on the same port across different isolates, set the shared
argument to true
when creating server socket and HttpServer
instances.
ServerSocketReference
and RawServerSocketReference
classes have been removed.reference
properties on ServerSocket
and RawServerSocket
have been removed.dart:isolate
spawnUri
added an environment
named argument.dart2js
and Dartium now support improved Javascript Interoperability via the js package.
docgen
and dartdocgen
no longer ship in the SDK. The docgen
sources have been removed from the repository.
This is the last release to ship the VM's “legacy debug protocol”. We intend to remove the legacy debug protocol in Dart VM 1.14.
The VM's Service Protocol has been updated to version 3.0 to take care of a number of issues uncovered by the first few non-observatory clients. This is a potentially breaking change for clients.
Dartium has been substantially changed. Rather than using C++ calls into Chromium internals for DOM operations it now uses JS interop. The DOM objects in dart:html
and related libraries now wrap a JavaScript object and delegate operations to it. This should be mostly transparent to users. However, performance and memory characteristics may be different from previous versions. There may be some changes in which DOM objects are wrapped as Dart objects. For example, if you get a reference to a Window object, even through JS interop, you will always see it as a Dart Window, even when used cross-frame. We expect the change to using JS interop will make it much simpler to update to new Chrome versions.
dart:io
Pub
Pub will now respect .gitignore
when validating a package before it's published. For example, if a LICENSE
file exists but is ignored, that is now an error.
If the package is in a subdirectory of a Git repository and the entire subdirectory is ignored with .gitignore
, pub will act as though nothing was ignored instead of uploading an empty package.
The heuristics for determining when pub get
needs to be run before various commands have been improved. There should no longer be false positives when non-dependency sections of the pubspec have been modified.
??
: if null operator. expr1 ?? expr2
evaluates to expr1
if not null
, otherwise expr2
.??=
: null-aware assignment. v ??= expr
causes v
to be assigned expr
only if v
is null
.x?.p
: null-aware access. x?.p
evaluates to x.p
if x
is not null
, otherwise evaluates to null
.x?.m()
: null-aware method invocation. x?.m()
invokes m
only if x
is not null
.dart:async
StreamController
added setters for the onListen
, onPause
, onResume
and onCancel
callbacks.dart:convert
LineSplitter
added a split
static method returning an Iterable
.dart:core
Uri
class now perform path normalization when a URI is created. This removes most ..
and .
sequences from the URI path. Purely relative paths (no scheme or authority) are allowed to retain some leading “dot” segments. Also added hasAbsolutePath
, hasEmptyPath
, and hasScheme
properties.dart:developer
log
function to transmit logging events to Observatory.dart:html
NodeTreeSanitizer
added the const trusted
field. It can be used instead of defining a NullTreeSanitizer
class when calling setInnerHtml
or other methods that create DOM from text. It is also more efficient, skipping the creation of a DocumentFragment
.dart:io
dart:isolate
onError
, onExit
and errorsAreFatal
parameters to Isolate.spawnUri
.dart:mirrors
InstanceMirror.delegate
moved up to ObjectMirror
.Documentation tools
dartdoc
is now the default tool to generate static HTML for API docs. Learn more.
docgen
and dartdocgen
have been deprecated. Currently plan is to remove them in 1.13.
Formatter (dartfmt
)
Over 50 bugs fixed.
Optimized line splitter is much faster and produces better output on complex code.
Observatory
Allocation profiling.
New feature to display output from logging.
Heap snapshot analysis works for 64-bit VMs.
Improved ability to inspect typed data, regex and compiled code.
Ability to break on all or uncaught exceptions from Observatory's debugger.
Ability to set closure-specific breakpoints.
‘anext’ - step past await/yield.
Preserve when a variable has been expanded/unexpanded in the debugger.
Keep focus on debugger input box whenever possible.
Echo stdout/stderr in the Observatory debugger. Standalone-only so far.
Minor fixes to service protocol documentation.
Pub
Breaking: various commands that previously ran pub get
implicitly no longer do so. Instead, they merely check to make sure the “.packages” file is newer than the pubspec and the lock file, and fail if it's not.
Added support for --verbosity=error
and --verbosity=warning
.
pub serve
now collapses multiple GET requests into a single line of output. For full output, use --verbose
.
pub deps
has improved formatting for circular dependencies on the entrypoint package.
pub run
and pub global run
Breaking: to match the behavior of the Dart VM, executables no longer run in checked mode by default. A --checked
flag has been added to run them in checked mode manually.
Faster start time for executables that don't import transformed code.
Binstubs for globally-activated executables are now written in the system encoding, rather than always in UTF-8
. To update existing executables, run pub cache repair
.
pub get
and pub upgrade
Pub will now generate a “.packages” file in addition to the “packages” directory when running pub get
or similar operations, per the package spec proposal. Pub now has a --no-package-symlinks
flag that will stop “packages” directories from being generated at all.
An issue where HTTP requests were sometimes made even though --offline
was passed has been fixed.
A bug with --offline
that caused an unhelpful error message has been fixed.
Pub will no longer time out when a package takes a long time to download.
pub publish
Pub will emit a non-zero exit code when it finds a violation while publishing.
.gitignore
files will be respected even if the package isn't at the top level of the Git repository.
Barback integration
A crashing bug involving transformers that only apply to non-public code has been fixed.
A deadlock caused by declaring transformer followed by a lazy transformer (such as the built-in $dart2js
transformer) has been fixed.
A stack overflow caused by a transformer being run multiple times on the package that defines it has been fixed.
A transformer that tries to read a non-existent asset in another package will now be re-run if that asset is later created.
BREAKING The service protocol now sends JSON-RPC 2.0-compatible server-to-client events. To reflect this, the service protocol version is now 2.0.
The service protocol now includes a "jsonrpc"
property in its responses, as opposed to "json-rpc"
.
The service protocol now properly handles requests with non-string ids. Numeric ids are no longer converted to strings, and null ids now don't produce a response.
Some RPCs that didn't include a "jsonrpc"
property in their responses now include one.
WebSocket.close()
would crash if called after WebSocket.cancel()
.pub
executable was run, even if a DART_SDK
environment variable is set.dart:core
Iterable
added an empty
constructor. dcf0286Iterable
can now be extended directly. An alternative to extending IterableBase
from dart:collection
.List
added an unmodifiable
constructor. r45334Map
added an unmodifiable
constructor. r45733int
added a gcd
method. a192ef4int
added a modInverse
method. f6f338cStackTrace
added a fromString
constructor. 68dd6f6Uri
added a directory
constructor. d8dbb4aConcurrentModificationError
as eagerly in release mode. In checked mode, the modification check is still as eager as possible. r45198dart:developer
- NEW
dart:profiler
library.debugger
and inspect
. 6e42aecdart:io
dart:html
Element
methods, appendHtml
and insertAdjacentHtml
now take nodeValidator
and treeSanitizer
parameters, and the inputs are consistently sanitized. r45818 announcementdart:isolate
priority
parameter of Isolate.ping
and Isolate.kill
is now a named parameter named priority
.Isolate.AS_EVENT
priority.Isolate
methods ping
and addOnExitListener
now have a named parameter response
. r45092Isolate.spawnUri
added a named argument checked
.dart:profiler
- DEPRECATED
dart:developer
instead.dart2js --output-type=dart
) utility as part of dart2jsdart:convert
dart:core
Uri.parse
added start
and end
positional arguments.dart:html
CssClassSet
method arguments must now be ‘tokens’, i.e. non-empty strings with no white-space characters. The implementation was incorrect for class names containing spaces. The fix is to forbid spaces and provide a faster implementation. Announcementdart:io
ProcessResult
now exposes a constructor.import
and Isolate.spawnUri
now supports the Data URI scheme on the VM.Running pub run foo
within a package now runs the foo
executable defined by the foo
package. The previous behavior ran bin/foo
. This makes it easy to run binaries in dependencies, for instance pub run test
.
On Mac and Linux, signals sent to pub run
and forwarded to the child command.
This is a bug fix release which merges a number of commits from bleeding_edge
.
dart2js: Addresses as issue with minified Javascript output with CSP enabled - r44453
Editor: Fixes accidental updating of files in the pub cache during rename refactoring - r44677
Editor: Fix for issue 23032 regarding skipped breakpoints on Windows - r44824
dart:mirrors: Fix MethodMirror.source
when the method is on the first line in a script - r44957, r44976
pub: Fix for issue 23084: Pub can fail to load transformers necessary for local development - r44876
Support for async
, await
, sync*
, async*
, yield
, yield*
, and await for
. See the the language tour for more details.
Enum support is fully enabled. See the language tour for more details.
The formatter is much more comprehensive and generates much more readable code. See its tool page for more details.
The analysis server is integrated into the IntelliJ plugin and the Dart editor. This allows analysis to run out-of-process, so that interaction remains smooth even for large projects.
Analysis supports more and better hints, including unused variables and unused private members.
There's a new model for shared server sockets with no need for a Socket
reference.
A new, much faster regular expression engine.
The Isolate API now works across the VM and dart2js
.
For more information on any of these changes, see the corresponding documentation on the Dart API site.
dart:async
:
Future.wait
added a new named argument, cleanUp
, which is a callback that releases resources allocated by a successful Future
.
The SynchronousStreamController
class was added as an explicit name for the type returned when the sync
argument is passed to new StreamController
.
dart:collection
: The new SplayTreeSet.from(Iterable)
constructor was added.
dart:convert
: Utf8Encoder.convert
and Utf8Decoder.convert
added optional start
and end
arguments.
dart:core
:
RangeError
added new static helper functions: checkNotNegative
, checkValidIndex
, checkValidRange
, and checkValueInInterval
.
int
added the modPow
function.
String
added the replaceFirstMapped
and replaceRange
functions.
dart:io
:
Support for locking files to prevent concurrent modification was added. This includes the File.lock
, File.lockSync
, File.unlock
, and File.unlockSync
functions as well as the FileLock
class.
Support for starting detached processes by passing the named mode
argument (a ProcessStartMode
) to Process.start
. A process can be fully attached, fully detached, or detached except for its standard IO streams.
HttpServer.bind
and HttpServer.bindSecure
added the v6Only
named argument. If this is true, only IPv6 connections will be accepted.
HttpServer.bind
, HttpServer.bindSecure
, ServerSocket.bind
, RawServerSocket.bind
, SecureServerSocket.bind
and RawSecureServerSocket.bind
added the shared
named argument. If this is true, multiple servers or sockets in the same Dart process may bind to the same address, and incoming requests will automatically be distributed between them.
Deprecation: the experimental ServerSocketReference
and RawServerSocketReference
classes, as well as getters that returned them, are marked as deprecated. The shared
named argument should be used instead. These will be removed in Dart 1.10.
Socket.connect
and RawSocket.connect
added the sourceAddress
named argument, which specifies the local address to bind when making a connection.
The static Process.killPid
method was added to kill a process with a given PID.
Stdout
added the nonBlocking
instance property, which returns a non-blocking IOSink
that writes to standard output.
dart:isolate
:
The static getter Isolate.current
was added.
The Isolate
methods addOnExitListener
, removeOnExitListener
, setErrorsFatal
, addOnErrorListener
, and removeOnErrorListener
now work on the VM.
Isolates spawned via Isolate.spawn
now allow most objects, including top-level and static functions, to be sent between them.
Code generation for SIMD on ARM and ARM64 is fixed.
A possible crash on MIPS with newer GCC toolchains has been prevented.
A segfault when using rethrow
was fixed (issue 21795).
Breakpoints can be set in the Editor using file suffixes (issue 21280).
IPv6 addresses are properly handled by HttpClient
in dart:io
, fixing a crash in pub (issue 21698).
Issues with the experimental async
/await
syntax have been fixed.
Issues with a set of number operations in the VM have been fixed.
ListBase
in dart:collection
always returns an Iterable
with the correct type argument.
dart:collection
: SplayTree
added the toSet
function.
dart:convert
: The JsonUtf8Encoder
class was added.
dart:core
:
The IndexError
class was added for errors caused by an index being outside its expected range.
The new RangeError.index
constructor was added. It forwards to new IndexError
.
RangeError
added three new properties. invalidProperty
is the value that caused the error, and start
and end
are the minimum and maximum values that the value is allowed to assume.
new RangeError.value
and new RangeError.range
added an optional message
argument.
The new String.fromCharCodes
constructor added optional start
and end
arguments.
dart:io
:
Support was added for the Application-Layer Protocol Negotiation extension to the TLS protocol for both the client and server.
SecureSocket.connect
, SecureServerSocket.bind
, RawSecureSocket.connect
, RawSecureSocket.secure
, RawSecureSocket.secureServer
, and RawSecureServerSocket.bind
added a supportedProtocols
named argument for protocol negotiation.
RawSecureServerSocket
added a supportedProtocols
field.
RawSecureSocket
and SecureSocket
added a selectedProtocol
field which contains the protocol selected during protocol negotiation.
pub
now generates binstubs for packages that are globally activated so that they can be put on the user's PATH
and used as normal executables. See the pub global activate
documentation.
When using dart2js
, deferred loading now works with multiple Dart apps on the same page.
dart:async
: Zone
, ZoneDelegate
, and ZoneSpecification
added the errorCallback
function, which allows errors that have been programmatically added to a Future
or Stream
to be intercepted.
dart:io
:
Breaking change: HttpClient.close
must be called for all clients or they will keep the Dart process alive until they time out. This fixes the handling of persistent connections. Previously, the client would shut down immediately after a request.
Breaking change: HttpServer
no longer compresses all traffic by default. The new autoCompress
property can be set to true
to re-enable compression.
dart:isolate
: Isolate.spawnUri
added the optional packageRoot
argument, which controls how it resolves package:
URIs.