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Release Notes
dart-lang/sdk (dart)
### [`v3.1.0`](https://togithub.com/dart-lang/sdk/blob/HEAD/CHANGELOG.md#310) [Compare Source](https://togithub.com/dart-lang/sdk/compare/3.0.7...3.1.0) ##### Libraries ##### `dart:async` - **Breaking change** [#52334][]: - Added the `interface` modifier to purely abstract classes: `MultiStreamController`, `StreamConsumer`, `StreamIterator` and `StreamTransformer`. As a result, these types can only be implemented, not extended or mixed in. [#52334]: https://togithub.com/dart-lang/sdk/issues/52334 ##### `dart:core` - `Uri.base` on native platforms now respects `IOOverrides` overriding current directory ([#39796][]). [#39796]: https://togithub.com/dart-lang/sdk/issues/39796 ##### `dart:io` - **Breaking change** [#51486][]: - Added `sameSite` to the `Cookie` class. - Added class `SameSite`. - **Breaking change** [#52027][]: `FileSystemEvent` is [`sealed`](https://dart.dev/language/class-modifiers#sealed). This means that `FileSystemEvent` cannot be extended or implemented. - Added a deprecation warning when `Platform` is instantiated. - Added `Platform.lineTerminator` which exposes the character or characters that the operating system uses to separate lines of text, e.g., `"\r\n"` on Windows. [#51486]: https://togithub.com/dart-lang/sdk/issues/51486 [#52027]: https://togithub.com/dart-lang/sdk/issues/52027 ##### `dart:js_interop` - **Object literal constructors**: `ObjectLiteral` is removed from `dart:js_interop`. It's no longer needed in order to declare an object literal constructor with inline classes. As long as an external constructor has at least one named parameter, it'll be treated as an object literal constructor. If you want to create an object literal with no named members, use `{}.jsify()`. ##### Other libraries ##### `package:js` - **Breaking change to `@staticInterop` and `external` extension members**: `external` `@staticInterop` members and `external` extension members can no longer be used as tear-offs. Declare a closure or a non-`external` method that calls these members, and use that instead. - **Breaking change to `@staticInterop` and `external` extension members**: `external` `@staticInterop` members and `external` extension members will generate slightly different JS code for methods that have optional parameters. Whereas before, the JS code passed in the default value for missing optionals, it will now pass in only the provided members. This aligns with how JS parameters work, where omitted parameters are actually omitted. For example, calling `external void foo([int a, int b])` as `foo(0)` will now result in `foo(0)`, and not `foo(0, null)`. ### [`v3.0.7`](https://togithub.com/dart-lang/sdk/blob/HEAD/CHANGELOG.md#307---2023-07-26) [Compare Source](https://togithub.com/dart-lang/sdk/compare/3.0.6...3.0.7) This is a patch release that: - Fixes a bug in dart2js which would cause certain uses of records to lead to bad codegen causing a `TypeError` or `NoSuchMethodError` to be thrown at runtime (issue [#53001]). [#53001]: https://togithub.com/dart-lang/sdk/issues/53001 ### [`v3.0.6`](https://togithub.com/dart-lang/sdk/blob/HEAD/CHANGELOG.md#306---2023-07-12) [Compare Source](https://togithub.com/dart-lang/sdk/compare/3.0.5...3.0.6) This is a patch release that: - Fixes a flow in flow analysis that causes it to sometimes ignore destructuring assignments (issue [#52767]). - Fixes an infinite loop in some web development compiles that include `is` or `as` expressions involving record types with named fields (issue [#52869]). - Fixes a memory leak in Dart analyzer's file-watching (issue [#52791]). - Fixes a memory leak of file system watcher related data structures (issue [#52793]). [#52767]: https://togithub.com/dart-lang/sdk/issues/52767 [#52869]: https://togithub.com/dart-lang/sdk/issues/52869 [#52791]: https://togithub.com/dart-lang/sdk/issues/52791 [#52793]: https://togithub.com/dart-lang/sdk/issues/52793 ### [`v3.0.5`](https://togithub.com/dart-lang/sdk/blob/HEAD/CHANGELOG.md#305---2023-06-14) [Compare Source](https://togithub.com/dart-lang/sdk/compare/3.0.4...3.0.5) This is a patch release that: - Fixes a bad cast in the frontend which can manifest as a crash in the dart2js `ListFactorySpecializer` during Flutter web builds (issue [#52403]). [#52403]: https://togithub.com/dart-lang/sdk/issues/52403 ### [`v3.0.4`](https://togithub.com/dart-lang/sdk/blob/HEAD/CHANGELOG.md#304---2023-06-07) [Compare Source](https://togithub.com/dart-lang/sdk/compare/3.0.3...3.0.4) This is a patch release that: - `dart format` now handles formatting nullable record types with no fields (dart_style issue [#1224]). - Fixes error when using records when targeting the web in development mode (issue [#52480]). [#1224]: https://togithub.com/dart-lang/dart_style/issues/1224 [#52480]: https://togithub.com/dart-lang/sdk/issues/52480 ### [`v3.0.3`](https://togithub.com/dart-lang/sdk/blob/HEAD/CHANGELOG.md#303---2023-02-07) [Compare Source](https://togithub.com/dart-lang/sdk/compare/3.0.2...3.0.3) This is a patch release that: - Fixes an AOT compiler crash when generating an implicit getter returning an unboxed record (issue [#52449]). - Fixes a situation in which variables appearing in multiple branches of an or-pattern might be erroneously reported as being mismatched (issue [#52373]). - Adds missing `interface` modifiers on the purely abstract classes `MultiStreamController`, `StreamConsumer`, `StreamIterator` and `StreamTransformer` (issue [#52334]). - Fixes an error during debugging when `InternetAddress.tryParse` is used (issue [#52423]). - Fixes a VM issue causing crashes on hot reload (issue [#126884]). - Improves linter support (issue [#4195]). - Fixes an issue in variable patterns preventing users from expressing a pattern match using a variable or wildcard pattern with a nullable record type (issue [#52439]). - Updates warnings and provide instructions for updating the Dart pub cache on Windows (issue [#52386]). [#52373]: https://togithub.com/dart-lang/sdk/issues/52373 [#52334]: https://togithub.com/dart-lang/sdk/issues/52334 [#52423]: https://togithub.com/dart-lang/sdk/issues/52423 [#126884]: https://togithub.com/flutter/flutter/issues/126884 [#4195]: https://togithub.com/dart-lang/linter/issues/4195 [#52439]: https://togithub.com/dart-lang/sdk/issues/52439 [#52449]: https://togithub.com/dart-lang/sdk/issues/52449 [#52386]: https://togithub.com/dart-lang/sdk/issues/52386 ### [`v3.0.2`](https://togithub.com/dart-lang/sdk/blob/HEAD/CHANGELOG.md#302---2023-05-24) [Compare Source](https://togithub.com/dart-lang/sdk/compare/3.0.1...3.0.2) This is a patch release that: - Fixes a dart2js crash when using a switch case expression on a record where the fields don't match the cases (issue [#52438]). - Add class modifier chips on class and mixin pages generated with `dart doc` (issue [#3392]). - Fixes a situation causing the parser to fail resulting in an infinite loop leading to higher memory usage (issue [#52352]). - Add clear errors when mixing inheritance in pre and post Dart 3 libraries (issue: [#52078]). [#52438]: https://togithub.com/dart-lang/sdk/issues/52438 [#3392]: https://togithub.com/dart-lang/dartdoc/issues/3392 [#52352]: https://togithub.com/dart-lang/sdk/issues/52352 [#52078]: https://togithub.com/dart-lang/sdk/issues/52078 ### [`v3.0.1`](https://togithub.com/dart-lang/sdk/blob/HEAD/CHANGELOG.md#301---2023-05-17) [Compare Source](https://togithub.com/dart-lang/sdk/compare/3.0.0...3.0.1) This is a patch release that: - Fixes a compiler crash involving redirecting factories and FFI (issue [#124369]). - Fixes a dart2js crash when using a combination of local functions, generics, and records (issue [#51899]). - Fixes incorrect error using a `void` in a switch case expression (issue [#52191]). - Fixes a false error when using in switch case expressions when the switch refers to a private getter (issue [#52041]). - Prevent the use of `when` and `as` as variable names in patterns (issue [#52260]). - Fixes an inconsistency in type promotion between the analyzer and VM (issue [#52241]). - Improve performance on functions with many parameters (issue [#1212]). [#124369]: https://togithub.com/flutter/flutter/issues/124369 [#51899]: https://togithub.com/dart-lang/sdk/issues/51899 [#52191]: https://togithub.com/dart-lang/sdk/issues/52191 [#52041]: https://togithub.com/dart-lang/sdk/issues/52041 [#52260]: https://togithub.com/dart-lang/sdk/issues/52260 [#52241]: https://togithub.com/dart-lang/sdk/issues/52241 [#1212]: https://togithub.com/dart-lang/dart_style/issues/1212 ### [`v3.0.0`](https://togithub.com/dart-lang/sdk/blob/HEAD/CHANGELOG.md#300---2023-05-10) [Compare Source](https://togithub.com/dart-lang/sdk/compare/2.19.6...3.0.0) ##### Language Dart 3.0 adds the following features. To use them, set your package's [SDK constraint][language version] lower bound to 3.0 or greater (`sdk: '^3.0.0'`). [language version]: https://dart.dev/guides/language/evolution - **[Records]**: Records are anonymous immutable data structures that let you aggregate multiple values together, similar to [tuples][] in other languages. With records, you can return multiple values from a function, create composite map keys, or use them any other place where you want to bundle a couple of objects together. For example, using a record to return two values: ```dart (double x, double y) geoLocation(String name) { if (name == 'Nairobi') { return (-1.2921, 36.8219); } else { ... } } ``` - **[Pattern matching]**: Expressions build values out of smaller pieces. Conversely, patterns are an expressive tool for decomposing values back into their constituent parts. Patterns can call getters on an object, access elements from a list, pull fields out of a record, etc. For example, we can destructure the record from the previous example like so: ```dart var (lat, long) = geoLocation('Nairobi'); print('Nairobi is at $lat, $long.'); ``` Patterns can also be used in [switch cases]. There, you can destructure values and also test them to see if they have a certain type or value: ```dart switch (object) { case [int a]: print('A list with a single integer element $a'); case ('name', _): print('A two-element record whose first field is "name".'); default: print('Some other object.'); } ``` Also, as you can see, non-empty switch cases no longer need `break;` statements. **Breaking change**: Dart 3.0 interprets [switch cases] as patterns instead of constant expressions. Most constant expressions found in switch cases are valid patterns with the same meaning (named constants, literals, etc.). You may need to tweak a few constant expressions to make them valid. This only affects libraries that have upgraded to language version 3.0. - **[Switch expressions]**: Switch expressions allow you to use patterns and multi-way branching in contexts where a statement isn't allowed: ```dart return TextButton( onPressed: _goPrevious, child: Text(switch (page) { 0 => 'Exit story', 1 => 'First page', _ when page == _lastPage => 'Start over', _ => 'Previous page', }), ); ``` - **[If-case statements and elements]**: A new if construct that matches a value against a pattern and executes the then or else branch depending on whether the pattern matches: ```dart if (json case ['user', var name]) { print('Got user message for user $name.'); } ``` There is also a corresponding [if-case element] that can be used in collection literals. - **[Sealed classes]**: When you mark a type `sealed`, the compiler ensures that switches on values of that type [exhaustively cover] every subtype. This enables you to program in an [algebraic datatype][] style with the compile-time safety you expect: ```dart sealed class Amigo {} class Lucky extends Amigo {} class Dusty extends Amigo {} class Ned extends Amigo {} String lastName(Amigo amigo) => switch (amigo) { Lucky _ => 'Day', Ned _ => 'Nederlander', }; ``` In this last example, the compiler reports an error that the switch doesn't cover the subclass `Dusty`. - **[Class modifiers]**: New modifiers `final`, `interface`, `base`, and `mixin` on `class` and `mixin` declarations let you control how the type can be used. By default, Dart is flexible in that a single class declaration can be used as an interface, a superclass, or even a mixin. This flexibility can make it harder to evolve an API over time without breaking users. We mostly keep the current flexible defaults, but these new modifiers give you finer-grained control over how the type can be used. **Breaking change:** Class declarations from libraries that have been upgraded to Dart 3.0 can no longer be used as mixins by default. If you want the class to be usable as both a class and a mixin, mark it [`mixin class`][mixin class]. If you want it to be used only as a mixin, make it a `mixin` declaration. If you haven't upgraded a class to Dart 3.0, you can still use it as a mixin. - **Breaking change** [#50902][]: Dart reports a compile-time error if a `continue` statement targets a [label] that is not a loop (`for`, `do` and `while` statements) or a `switch` member. Fix this by changing the `continue` to target a valid labeled statement. - **Breaking change** [language/#2357][]: Starting in language version 3.0, Dart reports a compile-time error if a colon (`:`) is used as the separator before the default value of an optional named parameter. Fix this by changing the colon (`:`) to an equal sign (`=`). [records]: https://dart.dev/language/records [tuples]: https://en.wikipedia.org/wiki/Tuple [pattern matching]: https://dart.dev/language/patterns [switch cases]: https://dart.dev/language/branches#switch [switch expressions]: https://dart.dev/language/branches#switch-expressions [if-case statements and elements]: https://dart.dev/language/branches#if-case [if-case element]: https://dart.dev/language/collections#control-flow-operators [sealed classes]: https://dart.dev/language/class-modifiers#sealed [exhaustively cover]: https://dart.dev/language/branches#exhaustiveness-checking [algebraic datatype]: https://en.wikipedia.org/wiki/Algebraic_data_type [class modifiers]: https://dart.dev/language/class-modifiers [mixin class]: https://dart.dev/language/mixins#class-mixin-or-mixin-class [#50902]: https://togithub.com/dart-lang/sdk/issues/50902 [label]: https://dart.dev/language/branches#switch [language/#2357]: https://togithub.com/dart-lang/language/issues/2357 ##### Libraries ##### General changes - **Breaking Change**: Non-`mixin` classes in the platform libraries can no longer be mixed in, unless they are explicitly marked as `mixin class`. The following existing classes have been made mixin classes: - `Iterable` - `IterableMixin` (now alias for `Iterable`) - `IterableBase` (now alias for `Iterable`) - `ListMixin` - `SetMixin` - `MapMixin` - `LinkedListEntry` - `StringConversionSink` ##### `dart:core` - Added `bool.parse` and `bool.tryParse` static methods. - Added `DateTime.timestamp()` constructor to get current time as UTC. - The type of `RegExpMatch.pattern` is now `RegExp`, not just `Pattern`. - **Breaking change** [#49529][]: - Removed the deprecated `List` constructor, as it wasn't null safe. Use list literals (e.g. `[]` for an empty list or `Configuration
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