fix(sdk): update dependency dart to >=3.13.4 <4.0.0

[renovate]

This PR contains the following updates:

Package	Update	Change
dart (source)	minor	>=3.12.2 <4.0.0 → >=3.13.4 <4.0.0

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Release Notes

dart-lang/sdk (dart)

v3.13.4

Compare Source

v3.13.3

Compare Source

Released on: 2026-09-01

This is a patch release that:

• Fixes an issue where Windows to Linux cross compilation
  produced incorrect executables if the applicatios used
  build hooks to link native code. (issue #​63953)

v3.13.2

Compare Source

Released on: 2026-08-25

This is a patch release that:

• Fixes incorrect dart2wasm compilation of constructor invocations when
  the class was determined to be not allocatable. (issue #​63809)
• Deprecates the legacy analyzer plugin system. (issue #​62164)
• Fixes dart2js compiler crash when compiling code with
  nested constants in record_use. (issue #​64070)
• Fixes a dart format crash and incorrect formatting with
  enums that use primary constructors.
  (issues dart-lang/dart_style#1885, dart-lang/dart_style#1888)

v3.13.1

Compare Source

Released on: 2026-08-18

This is a patch release that:

• Fixes dart fix --apply --code=migrate_design_widgets to
  replace URIs in both import and export statements. (issue #​63968)
• Fixes dart2wasm compiler crash in no-such-method forwarders.
  (issue #​63904)
• Fixes dart2wasm compilation error if 3rd party Type implementations exist.
  (issue #​63843)
• Fixes dart2wasm compiler crash if dynamic getter calls are used that
  target a getter implementation that was inferred to never return.
• Fixes dart2wasm compiler crash if named parameters in hierarchy have
  mixed "required"-ness. (issue #​60583)
• Fixes closure.hashCode sometimes returning null. (issue #​64035)

v3.13.0

Compare Source

Released on: 2026-08-12

Language

Dart 3.13 adds primary constructors to the language.
To use this feature, set your package's [SDK constraint][language version] lower
bound to 3.13 or greater (sdk: '^3.13.0').

Primary constructors

The primary constructors feature is a brevity feature. There are no new
semantics, but it lets you express declarations in a less verbose way.

This feature lets you specify one constructor and a set of instance variables
in the header of a declaration.

Currently, you write a declaration with a constructor and some fields as:

// Current syntax.
class Point {
  int x;
  int y;
  Point(this.x, this.y);
}

Now you can write:

class Point(var int x, var int y);

If a primary constructor needs an initializer list, a body, or both,
you can specify them inside the class using the this body syntax:

class Point(var int x, var int y) {
  this : assert(x >= 0) {
    print('Point created at $x, $y');
  }
}

As part of this feature, you can also use the new and factory keywords to
declare constructors in the class body without repeating the class name:

class Point {
  int x, y;

  // Equivalent to `Point(this.x, this.y)`:
  new(this.x, this.y);

  // Equivalent to `Point.origin()`:
  new origin() : x = 0, y = 0;

  // Equivalent to `factory Point.clone(Point other)`:
  factory clone(Point other) => Point(other.x, other.y);
}

To learn more about the feature, check out the
feature specification.

Other changes

• Breaking change: You can no longer use final or var on non-declaring
  parameters. Dart now reserves both for
  declaring parameters in primary constructors.
  Remove final or var from affected parameter declarations. If you still
  want to prevent parameter reassignment, you can use the
  parameter_assignments lint rule.
• Breaking change: A minor change has been made to type promotion to avoid
  unsound behavior. See SDK issue #​62889 for details.

Libraries

dart:async

• Added Future.pause as an alternative to Future.delayed with no callback.

dart:core

• Added List.unmodifiableOf with better typing than List.unmodifiable.
• Added Map.unmodifiableOf with better typing than Map.unmodifiable.
• Added two getters on int for efficient bit-counting:
  trailingZeroBitCount (ctz) and oneBitCount (popcount). On native
  platforms they operate on the full 64-bit two's-complement
  representation; on the web they operate on the least-significant 32 bits.
  For more details, see SDK issue #​52673.

dart:io

• The cookie-date parser now uses the correct algorithm again.
  A change to the parsing made it only accept the formats that
  cookie dates should have, but the RFC specifies a very
  permissive algorithm for what should be accepted.

• Behavioral change: File access and modification timestamps
  (File.lastModified, FileStat, lastAccessed, lastModified,
  setLastAccessed, setLastModified) now preserve microsecond precision
  instead of truncating or rounding to millisecond accuracy. See SDK issue
  #​42444.

• Breaking change:
  Added InterfaceAddress, a subtype of InternetAddress that exposes a
  prefixLength field and a broadcast getter for network interface addresses.
  NetworkInterface.addresses now returns List<InterfaceAddress>
  instead of List<InternetAddress>. Code that implements NetworkInterface
  and overrides addresses will need to update the return type.
  For more details, see SDK issue #​63216.

• The InternetAddress.lookup function no longer accepts invalid
  IPv4 addresses that are traditionally accepted by inet_aton.

dart:isolate

• Added synchronous execution and event loop control APIs to Isolate:
  Isolate.runSync, Isolate.create, Isolate.shutdownSync,
  Isolate.pinToCurrentThread, Isolate.isPinnedToCurrentThread,
  Isolate.runEventLoopSync, Isolate.onEvent, and Isolate.handleEvent.

dart:js_interop

• JSFunction and JSExportedDartFunction are now generic.
  JSExportedDartFunction<T>.toDart now casts the original wrapped function to
  the type argument T. Calls to isA<JSExportedDartFunction<T>> now also
  check that the wrapped function is a T. Otherwise, this type argument is
  purely descriptive and intended for increased static type safety. Importantly,
  the runtime types of JSFunction and JSExportedDartFunction do not change.
  For more details, see SDK issue #​54557.
• JSObject.getPrototypeOf is added.

Tools

Analyzer

• Added LSP support for Inline Values (textDocument/inlineValue), allowing
  IDEs and debuggers to render inline variable evaluations during active
  debugging sessions.
• Introduced custom LSP methods (dart/textDocument/getFlutterWidgetPreviews
  and dart/workspace/getFlutterWidgetPreviews) to serve Flutter Widget
  Preview metadata to editor clients.
• Introduced custom LSP method dart/connectToDtd enabling language server
  clients to pair the Analysis Server with the Dart Tooling Daemon (DTD).
• A no_raw_types lint rule is introduced, which replaces the
  strict-raw-types analysis option, offering a more consistent approach.
• A no_dynamic_casts lint rule is introduced, which replaces the
  strict-casts analysis option, offering a more consistent approach.
• The following lint rules have been determined to be low value, and are
  deprecated: avoid_private_typedef_functions, and one_member_abstracts.
  If there is desire to keep using these, they can be re-implemented with
  analyzer plugins.

Linter

• Added new lint rules:
  • async_return_with_no_await: Warns on async functions returning a
    non-Future value without using await.
  • empty_container_bodies: Highlights empty bodies in classes, enums,
    mixins, or extensions.
  • initialize_in_field_declaration: Recommends initializing fields at their
    declaration site where applicable.
  • unnecessary_const_in_enum_constructor: Flags redundant const keywords
    in enum constructors.
  • unnecessary_primary_constructor_body: Flags unnecessary or empty bodies
    on primary constructors.
  • unnecessary_type_name_in_constructor: Flags redundant explicit type
    names in constructor declarations.
  • use_declaring_parameters: Encourages declaring parameters in primary
    constructors.
• Added experimental lint rule use_primary_constructors to encourage
  adopting primary constructor syntax when Dart 3.13 primary constructor
  feature is enabled.

Formatter

• Show the supported language versions when running
  dart format --version --verbose.
• Don't crash if an analysis_options.yaml file has an include that points to
  a non-existent or unreadable file (dart_style #​1840).

The following minor style bug fixes are not language versioned and apply to all
formatted code:

• Fix a bug in eager splitting optimization that in rare cases would lead to a
  collection or argument list splitting unnecessarily (dart_style #​1809).

• Don't add a blank line before a comment at the end of a compilation unit or
  braced body (dart_style #​1644).

• Format extension type representation clauses the same way primary constructor
  formal parameter lists are formatted.

• When trailing commas are preserved, don't insert a newline before the ; in
  an enum with members unless there actually is a trailing comma.
  (Fix by @​Barbirosha.)

The following changes only apply when formatting code at language version 3.13
or higher:

• Write a trailing comma in split extension type representation clauses when
  formatting code at language version 3.13 or higher (dart_style #​1845).

• Fix a bug in an eager splitting optimization that would led the formatter to
  prefer less desirable solutions (dart_style #​1847).

• Prefer to split call chains for single-element targets (dart_style #​1732).

• Allow block formatting parameter lists (dart_style #​1693).

• Allow as, is, and is! expressions to be block formatted
  (dart_style #​1542).

• Separate imports into sections (dart_style #​1120).

• In if-case pieces, split the guard if the pattern block-splits
  (dart_style #​1596).

• When no solution fits the page width, prefer solutions where the overflowing
  lines have trailing string literals or comments (dart_style #​1802,
  dart_style #​1803, dart_style #​1837).

• Force blank lines around a mixin or extension type declaration if it doesn't
  have a ; body.

Pub

• Added dart pub workspace list command to list all packages in the
  workspace along with their directory paths, with support for JSON output via
  --json.
• Added dart pub check-resolution-up-to-date internal command for fast
  timestamp-based package resolution validation without contacting remote
  servers.
• Added dart pub cache preload command for installing packages into
  PUB_CACHE directly from .tar.gz archives.

Dart CLI

• Added support for cross-compilation to the dart build cli command via the
  --target-os and --target-arch flags.
• Both dart build and dart compile now support using locally-built target
  binaries from a local SDK build directory (identifiable by the presence of a
  build.ninja file), avoiding the need to download them from Google Cloud
  Storage.

Dart Runtime

• Built-in fallback root certificates used if the system certificates cannot be
  found are no longer included. The existing --root-certs-file and
  --root-certs-cache options to the standalone VM may be used to provide
  certificates if the system certificates cannot be found.

C Embedder API

• Breaking change: Updated Dart_FileModifiedCallback in
  runtime/include/dart_tools_api.h to pass int64_t since in microseconds
  since epoch (matching FileStat microsecond precision), updated from
  milliseconds.
• Added Dart_SetCurrentThreadOwnsIsolate and
  Dart_GetCurrentThreadOwnsIsolate functions in runtime/include/dart_api.h
  (and dart_api_dl.h), allowing custom embedders to bind and query isolate
  thread ownership.

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