This release is all about making your work easier and your apps more efficient. With key updates to null safety, performance boosts to the Dart CLI, and the exciting addition of the Dart and Flutter…

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Dart 3.9 introduces enhanced null safety with improved type promotion and reachability analysis, requiring SDK constraint updates to 3.9+. The release features a new MCP Server that enables AI assistants like Gemini CLI and GitHub Copilot to deeply understand Dart projects and perform actions like fixing runtime errors and managing dependencies. Performance improvements include AOT-compiled analysis server snapshots that make CLI commands up to 50% faster. Additional updates include git tag-based dependency resolution, cross-compilation support for ARM32 and RISC-V64 on Linux, and deprecation of 32-bit x86 architecture.

Announcing Dart 3.9

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