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Final extension types as safe containers for compile-time proofs

featureProposed language feature that solves one or more problemsProposed language feature that solves one or more problems

Status: Open.

#4692 In dart-lang/language;

· modulovalue opened on May 14, 2026

Establish a syntax-only test suite (like test262-parser-tests for JS)

Status: Open.

#4691 In dart-lang/language;

· modulovalue opened on May 13, 2026

Write a feature specification about the improved LUB

specification

type-inferenceType inference, issues or improvementsType inference, issues or improvements

Status: Open.

#4689 In dart-lang/language;

· eernstg opened on May 11, 2026

Support for typedef type parameters (zero-cost generics over extension types)

featureProposed language feature that solves one or more problemsProposed language feature that solves one or more problems

Status: Open.

#4686 In dart-lang/language;

· modulovalue opened on Apr 28, 2026

[augmentations] Making the order of part directives be semantically significant

augmentationsIssues related to the augmentations proposal.Issues related to the augmentations proposal.

questionFurther information is requestedFurther information is requested

Status: Open.

#4685 In dart-lang/language;

· bwilkerson opened on Apr 28, 2026

[static-extensions] Use the same kind of erasure with the on type as dot shorthands?

small-featureA small feature which is relatively cheap to implement.A small feature which is relatively cheap to implement.

static-extensionsIssues about the static-extensions featureIssues about the static-extensions feature

Status: Open.

#4683 In dart-lang/language;

· eernstg opened on Apr 17, 2026

Project wide namespacing for package imports

featureProposed language feature that solves one or more problemsProposed language feature that solves one or more problems

Status: Open.

#4680 In dart-lang/language;

· natty-pluz opened on Apr 10, 2026

Proposal: guiding principle for when void should be allowed

Status: Open.

#4679 In dart-lang/language;

· stereotype441 opened on Apr 7, 2026

Setter functions, parameterized setters.

featureProposed language feature that solves one or more problemsProposed language feature that solves one or more problems

Status: Open.

#4677 In dart-lang/language;

· lrhn opened on Apr 2, 2026

Feature request: Record Spread for Type-Safe copyWith-Style Updates

featureProposed language feature that solves one or more problemsProposed language feature that solves one or more problems

Status: Open.

#4676 In dart-lang/language;

· Hu-Wentao opened on Apr 2, 2026

Downwards inference of yield* is underspecified

Status: Open.

#4672 In dart-lang/language;

· stereotype441 opened on Mar 30, 2026

Exhaustiveness checking fails on sealed classes with multiple generic parameters, even with inout variance

requestRequests to resolve a particular developer problemRequests to resolve a particular developer problem

Status: Open.

#4667 In dart-lang/language;

· omar-mohamed-khallaf opened on Mar 23, 2026