feat(dart): update dependency dart to v3

[renovate]

This PR contains the following updates:

Package	Update	Change
dart (source)	major	>=2.19.6 <3.0.0 -> >=3.2.0 <4.0.0

---

Release Notes

dart-lang/sdk (dart)

v3.2.0

Compare Source

Language

Dart 3.2 adds the following features. To use them, set your package's SDK
constraint lower bound to 3.2 or greater (sdk: '^3.2.0').

• Private field promotion: In most circumstances, the types of private final
  fields can now be promoted by null checks and is tests. For example:

  class Example {
    final int? _privateField;
    Example(this._privateField);
  
    f() {
      if (_privateField != null) {
        // _privateField has now been promoted; you can use it without
        // null checking it.
        int i = _privateField; // OK
      }
    }
  }
  
  // Private field promotions also work from outside of the class:
  f(Example x) {
    if (x._privateField != null) {
      int i = x._privateField; // OK
    }
  }

  To ensure soundness, a field is not eligible for field promotion in the
  following circumstances:

  • If it's not final (because a non-final field could be changed in between the
    test and the usage, invalidating the promotion).
  • If it's overridden elsewhere in the library by a concrete getter or a
    non-final field (because an access to an overridden field might resolve at
    runtime to the overriding getter or field).
  • If it's not private (because a non-private field might be overridden
    elsewhere in the program).
  • If it has the same name as a concrete getter or a non-final field in some
    other unrelated class in the library (because a class elsewhere in the
    program might extend one of the classes and implement the other, creating an
    override relationship between them).
  • If there is a concrete class C in the library whose interface contains a
    getter with the same name, but C does not have an implementation of that
    getter (such unimplemented getters aren't safe for field promotion, because
    they are implicitly forwarded to noSuchMethod, which might not return the
    same value each time it's called).

• Breaking Change #​53167: Use a more precise split point for refutable
  patterns. Previously, in an if-case statement, if flow analysis could prove
  that the scrutinee expression was guaranteed to throw an exception, it would
  sometimes fail to propagate type promotions implied by the pattern to the
  (dead) code that follows. This change makes the type promotion behavior of
  if-case statements consistent regardless of whether the scrutinee expression
  throws an exception.

  No live code is affected by this change, but there is a small chance that the
  change in types will cause a compile-time error to appear in some dead code in
  the user's project, where no compile-time error appeared previously.

Libraries

dart:async

• Added broadcast parameter to Stream.empty constructor.

dart:convert

• Breaking change #​52801:
  • Changed return types of utf8.encode() and Utf8Codec.encode() from
    List<int> to Uint8List.

dart:developer

• Deprecated the Service.getIsolateID method.
• Added getIsolateId method to Service.
• Added getObjectId method to Service.

dart:ffi

• Added the NativeCallable.isolateLocal constructor. This creates
  NativeCallables with the same functionality as Pointer.fromFunction,
  except that NativeCallable accepts closures.
• Added the NativeCallable.keepIsolateAlive method, which determines whether
  the NativeCallable keeps the isolate that created it alive.
• All NativeCallable constructors can now accept closures. Previously
  NativeCallables had the same restrictions as Pointer.fromFunction, and
  could only create callbacks for static functions.
• Breaking change [#​53311][]: NativeCallable.nativeFunction now throws an
  error if is called after the NativeCallable has already been closed. Calls
  to close after the first are now ignored.

dart:io

• Breaking change #​53005: The headers returned by
  HttpClientResponse.headers and HttpRequest.headers no longer include
  trailing whitespace in their values.

• Breaking change #​53227: Folded headers values returned by
  HttpClientResponse.headers and HttpRequest.headers now have a space
  inserted at the fold point.

dart:isolate

• Added Isolate.packageConfigSync and Isolate.resolvePackageUriSync APIs.

dart:js_interop

• Breaking Change on JSNumber.toDart and Object.toJS:
  JSNumber.toDart is removed in favor of toDartDouble and toDartInt to
  make the type explicit. Object.toJS is also removed in favor of
  Object.toJSBox. Previously, this function would allow Dart objects to flow
  into JS unwrapped on the JS backends. Now, there's an explicit wrapper that is
  added and unwrapped via JSBoxedDartObject.toDart. Similarly,
  JSExportedDartObject is renamed to JSBoxedDartObject and the extensions
  ObjectToJSExportedDartObject and JSExportedDartObjectToObject are renamed
  to ObjectToJSBoxedDartObject and JSBoxedDartObjectToObject in order to
  avoid confusion with @JSExport.
• Type parameters in external APIs:
  Type parameters must now be bound to a static interop type or one of the
  dart:js_interop types like JSNumber when used in an external API. This
  only affects dart:js_interop classes and not package:js or other forms of
  JS interop.
• Subtyping dart:js_interop types:
  @staticInterop types can subtype only JSObject and JSAny from the set of
  JS types in dart:js_interop. Subtyping other types from dart:js_interop
  would result in confusing type errors before, so this makes it a static error.
• Global context of dart:js_interop and @staticInterop APIs:
  Static interop APIs will now use the same global context as non-static interop
  instead of globalThis to avoid a greater migration. Static interop APIs,
  either through dart:js_interop or the @staticInterop annotation, have used
  JavaScript's globalThis as the global context. This is relevant to things
  like external top-level members or external constructors, as this is the root
  context we expect those members to reside in. Historically, this was not the
  case in Dart2JS and DDC. We used either self or DDC's global in non-static
  interop APIs with package:js. So, static interop APIs will now use one of
  those global contexts. Functionally, this should matter in only a very small
  number of cases, like when using older browser versions. dart:js_interop's
  globalJSObject is also renamed to globalContext and returns the global
  context used in the lowerings.
• Breaking Change on Types of dart:js_interop External APIs:
  External JS interop APIs when using dart:js_interop are restricted to a set
  of allowed types. Namely, this include the primitive types like String, JS
  types from dart:js_interop, and other static interop types (either through
  @staticInterop or extension types).
• Breaking Change on dart:js_interop isNull and isUndefined:
  null and undefined can only be discerned in the JS backends. dart2wasm
  conflates the two values and treats them both as Dart null. Therefore, these
  two helper methods should not be used on dart2wasm and will throw to avoid
  potentially erroneous code.
• Breaking Change on dart:js_interop typeofEquals and instanceof:
  Both APIs now return a bool instead of a JSBoolean. typeofEquals also
  now takes in a String instead of a JSString.
• Breaking Change on dart:js_interop JSAny and JSObject:
  These types can only be implemented, and no longer extended, by user
  @staticInterop types.
• Breaking Change on dart:js_interop JSArray.withLength:
  This API now takes in an int instead of JSNumber.

Tools

Development JavaScript compiler (DDC)

• Applications compiled by DDC will no longer add members to the native
  JavaScript Object prototype.
• Breaking change for JS interop with Symbols and BigInts:
  JavaScript Symbols and BigInts are now associated with their own
  interceptor and should not be used with package:js classes. These types were
  being intercepted with the assumption that they are a subtype of JavaScript's
  Object, but this is incorrect. This lead to erroneous behavior when using
  these types as Dart Objects. See #​53106 for more details. Use
  dart:js_interop's JSSymbol and JSBigInt with extension types to interop
  with these types.

Production JavaScript compiler (dart2js)

• Breaking change for JS interop with Symbols and BigInts:
  JavaScript Symbols and BigInts are now associated with their own
  interceptor and should not be used with package:js classes. These types were
  being intercepted with the assumption that they are a subtype of JavaScript's
  Object, but this is incorrect. This lead to erroneous behavior when using
  these types as Dart Objects. See #​53106 for more details. Use
  dart:js_interop's JSSymbol and JSBigInt with extension types to interop
  with these types.

Dart command line

• The dart create command has a new cli template
  to quickly create Dart command-line applications
  with basic argument parsing capabilities.
  To learn more about using the template,
  run dart help create.

Dart format

• Always split enum declarations containing a line comment.
• Fix regression in splitting type annotations with library prefixes.
• Support --enable-experiment command-line option to enable language
  experiments.

DevTools

• Incorporated the 2.26.1, 2.27.0, and
  2.28.1 releases of DevTools.

Linter

• Added the experimental [annotate_redeclares][annotate_redeclares] lint.
• Marked the [use_build_context_synchronously][use_build_context_synchronously] lint as stable.

Pub

• New option dart pub upgrade --tighten which will update dependencies' lower
  bounds in pubspec.yaml to match the current version.
• The commands dart pub get/add/upgrade will now show if a dependency
  changed between direct, dev and transitive dependency.
• The command dart pub upgrade no longer shows unchanged dependencies.

v3.1.5

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This is a patch release that:

• Fixes an issue affecting Dart compiled to JavaScript running in Node.js 21. A
  change in Node.js 21 affected the Dart Web compiler runtime. This patch
  release accomodates for those changes (issue #​53810).

v3.1.4

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This is a patch release that:

• Fixes an issue in the Dart VM, users are not being able to see
  value of variables while debugging code (issue [#​53747]).

v3.1.3

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This is a patch release that:

• Fixes a bug in dart2js which would cause the compiler to crash when using
  @staticInterop @anonymous factory constructors with type parameters (see
  issue #​53579 for more details).

• The standalone Dart VM now exports symbols only for the Dart_* embedding API
  functions, avoiding conflicts with other DSOs loaded into the same process,
  such as shared libraries loaded through dart:ffi, that may have different
  versions of the same symbols (issue [#​53503]).

• Fixes an issue with super slow access to variables while debugging.
  The fix avoids searching static functions in the imported libraries
  as references to members are fully resolved by the front-end. (issue
  #​53541)

v3.1.2

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This is a patch release that:

• Fixes a bug in dart2js which crashed the compiler when a typed record pattern
  was used outside the scope of a function body, such as in a field initializer.
  For example final x = { for (var (int a,) in someList) a: a };
  (issue #​53449)

• Fixes an expedient issue of users seeing an unhandled
  exception pause in the debugger, please https://github.com/dart-lang/sdk/issues/53450es/53450 for more
  details.
  The fix uses try/catch in lookupAddresses instead of
  Future error so that we don't see an unhandled exception
  pause in the debugger (issue #​53450)

v3.1.1

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This is a patch release that:

• Fixes a bug in the parser which prevented a record pattern from containing a
  nested record pattern, where the nested record pattern uses record
  destructuring shorthand syntax, for example final ((:a, :b), c) = record;
  (issue #​53352).

v3.1.0

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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.

dart:core

• Uri.base on native platforms now respects IOOverrides overriding
  current directory (#​39796).

dart:ffi

• Added the NativeCallable class, which can be used to create callbacks that
  allow native code to call into Dart code from any thread. See
  NativeCallable.listener. In future releases, NativeCallable will be
  updated with more functionality, and will become the recommended way of
  creating native callbacks for all use cases, replacing Pointer.fromFunction.

dart:io

• Breaking change #​51486:
  • Added sameSite to the Cookie class.
  • Added class SameSite.
• Breaking change #​52027: FileSystemEvent is
  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.

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).

Tools

DevTools

• Incorporated the 2.24.0 and 2.25.0
  releases of DevTools.

Linter

• Added new static analysis lints you can enable in
  your package's analysis_options.yaml file:
  • no_self_assignments
  • no_wildcard_variable_uses

v3.0.7

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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).

v3.0.6

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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).

v3.0.5

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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).

v3.0.4

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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).

v3.0.3

Compare Source

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).

v3.0.2

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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).

v3.0.1

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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).

v3.0.0

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Language

Dart 3.0 adds the following features. To use them, set your package's SDK
constraint lower bound to 3.0 or greater (sdk: '^3.0.0').

• 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:

  (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:

  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:

  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:

  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:

  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:

  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. 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 (=).

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 <int>[] for an empty
    typed list) or [List.filled][List.filled].
  • Removed the deprecated onError argument on [int.parse][int.parse], [double.parse][double.parse],
    and [num.parse][num.parse]. Use the [tryParse][tryParse] method instead.
  • Removed the deprecated [proxy][proxy] and [Provisional][Provisional] annotations.
    The original proxy annotation has no effect in Dart 2,
    and the Provisional type and [provisional][provisional] constant
    were only used internally during the Dart 2.0 development process.
  • Removed the deprecated [Deprecated.expires][Deprecated.expires] getter.
    Use [Deprecated.message][Deprecated.message] instead.
  • Removed the deprecated [CastError][CastError] error.
    Use [TypeError][TypeError] instead.
  • Removed the deprecated [FallThroughError][FallThroughError] error. The kind of
    fall-through previously throwing this error was made a compile-time
    error in Dart 2.0.
  • Removed the deprecated [NullThrownError][NullThrownError] error. This error is never
    thrown from null safe code.
  • Removed the deprecated [AbstractClassInstantiationError][AbstractClassInstantiationError] error. It was made
    a compile-time error to call the constructor of an abstract class in Dart 2.0.
  • Removed the deprecated [CyclicInitializationError][CyclicInitializationError]. Cyclic dependencies are
    no longer detected at runtime in null safe code. Such code will fail in other
    ways instead, possibly with a StackOverflowError.
  • Removed the deprecated [NoSuchMethodError][NoSuchMethodError] default constructor.
    Use the [NoSuchMethodError.withInvocation][NoSuchMethodError.withInvocation] named constructor instead.
  • Removed the deprecated [BidirectionalIterator][BidirectionalIterator] class.
    Existing bidirectional iterators can still work, they just don't have
    a shared supertype locking them to a specific name for moving backwards.

• Breaking change when migrating code to Dart 3.0:
  Some changes to platform libraries only affect code when that code is migrated
  to language version 3.0.

  • The Function type can no longer be implemented, extended or mixed in.
    Since Dart 2.0 writing implements Function has been allowed
    for backwards compatibility, but it has not had any effect.
    In Dart 3.0, the Function type is final and cannot be subtyped,
    preventing code from mistakenly assuming it works.

  • The following declarations can only be implemented, not extended:

    • Comparable
    • Exception
    • Iterator
    • Pattern
    • Match
    • RegExp
    • RegExpMatch
    • StackTrace
    • StringSink

    None of these declarations contained any implementation to inherit,
    and are marked as interface to signify that they are only intended
    as interfaces.

  • The following declarations can no longer be implemented or extended:

    • MapEntry
    • OutOfMemoryError
    • StackOverflowError
    • Expando
    • WeakReference
    • Finalizer

    The MapEntry value class is restricted to enable later optimizations.
    The remaining classes are tightly coupled to the platform and not
    intended to be subclassed or implemented.

dart:async

• Added extension member wait on iterables and 2-9 tuples of futures.

• Breaking change #​49529:

  • Removed the deprecated [DeferredLibrary][DeferredLibrary] class.
    Use the [deferred as][deferred as] import syntax instead.

dart:collection

• Added extension members nonNulls, firstOrNull, lastOrNull,
  singleOrNull, elementAtOrNull and indexed on Iterables.
  Also exported from dart:core.

• Deprecated the HasNextIterator class (#​50883).

• Breaking change when migrating code to Dart 3.0:
  Some changes to platform libraries only affect code when it is migrated
  to language version 3.0.

  • The following interface can no longer be extended, only implemented:
    • Queue
  • The following implementation classes can no longer be implemented:
    • LinkedList
    • LinkedListEntry
  • The following implementation classes can no longer be implemented
    or extended:
    • HasNextIterator (Also deprecated.)
    • HashMap
    • LinkedHashMap
    • HashSet
    • LinkedHashSet
    • DoubleLinkedQueue
    • ListQueue
    • SplayTreeMap
    • SplayTreeSet

dart:developer

• Breaking change #​49529:

  • Removed the deprecated [MAX_USER_TAGS][MAX_USER_TAGS] constant.
    Use [maxUserTags][maxUserTags] instead.

• Callbacks passed to registerExtension will be run in the zone from which
  they are registered.

• Breaking change #​50231:

  • Removed the deprecated [Metrics][Metrics], [Metric][Metric], [Counter][Counter],
    and [Gauge][Gauge] classes as they have been broken since Dart 2.0.

dart:html

• Breaking change: As previously announced, the deprecated registerElement
  and registerElement2 methods in Document and HtmlDocument have been
  removed. See #​49536 for
  details.

dart:math

• Breaking change when migrating code to Dart 3.0:
  Some changes to platform libraries only affect code when it is migrated
  to language version 3.0.
  • The Random interface can only be implemented, not extended.

dart:io

• Added name and signalNumber to the ProcessSignal class.
• Deprecate NetworkInterface.listSupported. Has always returned true since
  Dart 2.3.
• Finalize httpEnableTimelineLogging parameter name transition from enable
  to enabled. See #​43638.
• Favor IPv4 connections over IPv6 when connecting sockets. See
  #​50868.
• Breaking change #​51035:
  • Update NetworkProfiling to accommodate new String ids
    that are introduced in vm_service:11.0.0

dart:js_util

• Added several helper functions to access more JavaScript operators, like
  delete and the typeof functionality.
• jsify is now permissive and has inverse semantics to dartify.
• jsify and dartify both handle types they understand natively more
  efficiently.
• Signature of callMethod has been aligned with the other methods and
  now takes Object instead of String.

Tools

Observatory

• Observatory is no longer served by default and users should instead use Dart
  DevTools. Users requiring specific functionality in Observatory should set
  the --serve-observatory flag.

Web Dev Compiler (DDC)

• Removed deprecated command line flags -k, --kernel, and --dart-sdk.
• The compile time flag --nativeNonNullAsserts, which ensures web library APIs
  are sound in their nullability, is by default set to true in sound mode. For
  more information on the flag, see NATIVE_NULL_ASSERTIONS.md.

dart2js

• The compile time flag --native-null-assertions, which ensures web library
  APIs are sound in their nullability, is by default set to true in sound mode,
  unless -O3 or higher is passed, in which case they are not checked. For more
  information on the flag, see NATIVE_NULL_ASSERTIONS.md.

Dart2js

• Cleanup related to #​46100:
  the internal dart2js snapshot fails unless it is called from a supported
  interface, such as dart compile js, flutter build, or
  build_web_compilers. This is not expected to be a visible change.

Formatter

• Format sync* and async* functions with => bodies.
• Don't split after < in collection literals.
• Better indentation of multiline function types inside type argument lists.
• Fix bug where parameter metadata wouldn't always split when it should.

Analyzer

• Most static analysis "hints" are converted to be "warnings," and any
  remaining hints are intended to be converted soon after the Dart 3.0 release.
  This means that any (previously) hints reported by dart analyze are now
  considered "fatal" (will result in a non-zero exit code). The previous
  behavior, where such hints (now warnings) are not fatal, can be achieved by
  using the --no-fatal-warnings flag. This behavior can also be altered, on a
  code-by-code basis, by changing the severity of rules in an analysis
  options file.
• Add static enforcement of the SDK-only @Since annotation. When code in a
  package uses a Dart SDK element annotated with @Since, analyzer will report
  a warning if the package's Dart SDK constraint allows versions of Dart
  which don't include that element.
• Protects the Dart Analysis Server against extreme memory usage by limiting
  the number of plugins per analysis context to 1. (issue [#​50981][]).

Linter

Updates the Linter to 1.35.0, which includes changes that

• add new lints:
  • implicit_reopen
  • unnecessary_breaks
  • type_literal_in_constant_pattern
  • invalid_case_patterns
• update existing lints to support patterns and class modifiers
• remove support for:
  • enable_null_safety
  • invariant_booleans
  • prefer_bool_in_asserts
  • prefer_equal_for_default_values
  • super_goes_last
• fix unnecessary_parenthesis false-positives with null-aware expressions.
• fix void_checks to allow assignments of Future<dynamic>? to parameters
  typed FutureOr<void>?.
• fix use_build_context_synchronously in if conditions.
• fix a false positive for avoid_private_typedef_functions with generalized
  type aliases.
• update unnecessary_parenthesis to detect some doubled parens.
• update void_checks to allow returning Never as void.
• update no_adjacent_strings_in_list to support set literals and for- and
  if-elements.
• update avoid_types_as_parameter_names to handle type variables.
• update avoid_positional_boolean_parameters to handle typedefs.
• update avoid_redundant_argument_values to check parameters of redirecting
  constructors.
• improve performance for prefer_const_literals_to_create_immutables.
• update use_build_context_synchronously to check context properties.
• improve unnecessary_parenthesis support for property accesses and method
  invocations.
• update unnecessary_parenthesis to allow parentheses in more null-aware
  cascade contexts.
• update unreachable_from_main to track static elements.
• update unnecessary_null_checks to not report on arguments passed to
  Future.value or Completer.complete.
• mark always_use_package_imports and prefer_relative_imports as
  incompatible rules.
• update only_throw_errors to not report on Never-typed expressions.
• update unnecessary_lambdas to not report with late final variables.
• update avoid_function_literals_in_foreach_calls to not report with nullable-
  typed targets.
• add new lint: deprecated_member_use_from_same_package which replaces the
  soft-deprecated analyzer hint of the same name.
• update public_member_api_docs to not require docs on enum constructors.
• update prefer_void_to_null to not report on as-expressions.

Migration tool removal

The null safety migration tool (dart migrate) has been removed. If you still
have code which needs to be migrated to null safety, please run dart migrate
using Dart version 2.19, before upgrading to Dart version 3.0.

Pub

• To preserve compatibility with null-safe code pre Dart 3, Pub will interpret a
  language constraint indicating a language version of 2.12 or higher and an
  upper bound of <3.0.0 as <4.0.0.

  For example >=2.19.2 <3.0.0 will be interpreted as >=2.19.2 <4.0.0.

• dart pub publish will no longer warn about dependency_overrides. Dependency
  overrides only take effect in the root package of a resolution.

• dart pub token add now verifies that the given token is valid for including
  in a header according to RFC 6750 section
  2.1. This means they must
  contain only the characters: ^[a-zA-Z0-9._~+/=-]+$. Before a failure would
  happen when attempting to send the authorization header.

• dart pub get and related commands will now by default also update the
  dependencies in the example folder (if it exists). Use --no-example to
  avoid this.

• On Windows the PUB_CACHE has moved to %LOCALAPPDATA%, since Dart 2.8 the
  PUB_CACHE has been created in %LOCALAPPDATA% when one wasn't present.
  Hence, this only affects users with a PUB_CACHE created by Dart 2.7 or
  earlier. If you have path/to/.pub-cache/bin in PATH you may need to
  update your PATH.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3d7b1f5) 100.00% compared to head (84bb4d3) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #204   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           31        31           
=========================================
  Hits            31        31           

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[zeshuaro]

🎉 This PR is included in version 2.6.0 🎉

The release is available on:

• v2.6.0
• GitHub release

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