Update dependency dart to v3

[renovate]

This PR contains the following updates:

Package	Update	Change
dart (source)	major	>=2.12.0 <3.0.0 -> <4.0.0

---

Release Notes

dart-lang/sdk (dart)

v3.1.0

Compare Source

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: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).

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

Compare Source

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

Compare Source

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

Compare Source

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

Compare Source

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

Compare Source

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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