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Dart2JS should inline spreads of literals in collections

area-web-jsIssues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.Issues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.

type-performanceIssue relates to performance or code sizeIssue relates to performance or code size

web-dart2js

Status: Open.

#62226 In dart-lang/sdk;

· lrhn opened on Dec 11, 2025

Bug with dart2js

area-web-jsIssues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.Issues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.

type-bugIncorrect behavior (everything from a crash to more subtle misbehavior)Incorrect behavior (everything from a crash to more subtle misbehavior)

web-dart2js

Status: Open.

#62185 In dart-lang/sdk;

· antonbashir opened on Dec 6, 2025

Add --allow-native-core-library-imports to DDC and dart2js to allow for native library imports

area-web-jsIssues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.Issues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.

P2A bug or feature request we're likely to work onA bug or feature request we're likely to work on

triagedIssue has been triaged by sub teamIssue has been triaged by sub team

web-dart2js

web-dev-compiler

Status: Open.

#62128 In dart-lang/sdk;

· bkonyi opened on Nov 28, 2025

Create <code>dart:mirrors</code> stubs for <code>dart2js</code> and <code>DDC</code>

area-web-jsIssues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.Issues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.

P2A bug or feature request we're likely to work onA bug or feature request we're likely to work on

triagedIssue has been triaged by sub teamIssue has been triaged by sub team

web-dart2js

web-dev-compiler

Status: Open.

#62127 In dart-lang/sdk;

· bkonyi opened on Nov 28, 2025

Create <code>dart:ffi</code> stubs for <code>dart2js</code> and <code>DDC</code>

area-web-jsIssues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.Issues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.

P2A bug or feature request we're likely to work onA bug or feature request we're likely to work on

triagedIssue has been triaged by sub teamIssue has been triaged by sub team

web-dart2js

web-dev-compiler

Status: Open.

#62126 In dart-lang/sdk;

· bkonyi opened on Nov 28, 2025

[ Meta ] Support conditionally allowing for imports of platform-specific core libraries on unsupported platforms

area-web-jsIssues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.Issues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.

P2A bug or feature request we're likely to work onA bug or feature request we're likely to work on

triagedIssue has been triaged by sub teamIssue has been triaged by sub team

web-dart2js

web-dev-compiler

Status: Open.

#62125 In dart-lang/sdk;

· bkonyi opened on Nov 28, 2025

[dart2js] Guarantees around deferred loading &amp; prefetching

area-dart2wasmIssues for the dart2wasm compiler.Issues for the dart2wasm compiler.

area-web-jsIssues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.Issues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.

web-dart2js

Status: Open.

#62114 In dart-lang/sdk;

· mkustermann opened on Nov 27, 2025

[Primary Constructors] Dart2js Implementation

area-web-jsIssues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.Issues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.

feature-primary-constructorsImplementation of the primary constructors feature. Otherwise known as declaring constructors.Implementation of the primary constructors feature. Otherwise known as declaring constructors.

web-dart2js

Status: Open.

#62049 In dart-lang/sdk;

· kallentu opened on Nov 20, 2025

Under-optimized pattern for Dart2JS

area-web-jsIssues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.Issues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.

type-performanceIssue relates to performance or code sizeIssue relates to performance or code size

web-dart2js

Status: Open.

#61998 In dart-lang/sdk;

· lrhn opened on Nov 17, 2025

[dart2js] Consider using JavaScript's BigInt to implement Dart's BigInt

area-web-jsIssues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.Issues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.

P3A lower priority bug or feature requestA lower priority bug or feature request

web-dart2js

web-dev-compiler

Status: Open.

#61842 In dart-lang/sdk;

· rakudrama opened on Oct 28, 2025

Comparison with default object in optional parameter fails in JS release build

area-web-jsIssues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.Issues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.

web-dart2js

Status: Open.

#61767 In dart-lang/sdk;

· rebaz94 opened on Oct 21, 2025

Flakiness when running dart test --platform chrome/firefox

area-web-jsIssues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.Issues related to JavaScript support for Dart Web, including DDC, dart2js, and JS interop.

P2A bug or feature request we're likely to work onA bug or feature request we're likely to work on

type-bugIncorrect behavior (everything from a crash to more subtle misbehavior)Incorrect behavior (everything from a crash to more subtle misbehavior)

web-dart2js

Status: Open.

#61719 In dart-lang/sdk;

· ahmednfwela opened on Oct 12, 2025