rethrow statement.break, continue, rethrow, return or throw.= as well as : as separator for named parameter default values.dart:core: Set.difference now takes a Set<Object> as argument.
dart:developer:
Dart Dev Compiler
loadLibrary() on deferred libraries. Deferred libraries are still loaded eagerly. (#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.
dart:core: Remove deprecated Resource class. Use the class in package:resource instead.dart:asyncFuture.wait now catches synchronous errors and returns them in the returned Future.Future on Stream.cancel operations. Discourages to return null from cancel.dart:ioWebSocket.addUtf8Text to allow sending a pre-encoded text message without a round-trip UTF-8 conversion.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.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:coreUri.resolve (SDK issue 26804).dart:ioFileLock.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.