How to use dart-sdk-skills to empower your AI coding agent to seamlessly migrate Flutter projects to standalone materialui and cupertinoui packages
The Flutter framework has undergone one of its most significant architectural evolutions: the complete unbundling of Material Design and Cupertino libraries into standalone pub packages (materialui and cupertinoui).
While this decoupling brings independent release cycles, lighter core framework footprints, and true headless UI development, it also introduces a massive migration across existing Flutter apps.
If you rely on AI coding assistants (such as Claude Code, Google Antigravity, Cursor, GitHub Copilot, or Cline), you have likely hit a familiar wall: LLM training cutoffs. Most models still generate monolithic package:flutter/material.dart imports and do not know how to perform the new split package migration.
In this article, we will explore how the open-source dart-sdk-skills repository gives your AI agent the exact knowledge and execution runbooks to automate this migration in a single prompt.
Historically, Flutter bundled every Material Design and Cupertino widget directly into the core flutter SDK. While convenient initially, this approach had drawbacks: Coupled Release Cycles: Updating a single Material button style required waiting for a framework release. Framework Bloat: Apps building custom enterprise design systems were forced to bundle hundreds of unused Material and Cupertino classes. Design System Collision: Mixing platform styles often led to tangled dependencies.
Both design systems are now maintained as independent packages by the official Flutter team on pub.dev: materialui (^1.1.0): Canonical entrypoint package:materialui/materialui.dart cupertinoui (^1.0.1): Canonical entrypoint package:cupertinoui/cupertinoui.dart
When you tell an unassisted AI agent: "Migrate my app to the new split Flutter design packages."
It often stumbles: It hallucinates deprecated import paths or non-existent package names. It does not know about the automated data-driven fix rules in the Dart analyzer. It misses breaking changes in localization delegates (GlobalMaterialLocalizations).
dart-sdk-skills is an authoritative repository of version-by-version agent skills for the Dart and Flutter SDKs. Built using the open Agent Skill specification (SKILL.md), it progressively discloses precise rules, API matrices, and tactical upgrade runbooks to your AI pair programmer.
Once installed, your agent automatically recognizes split-package requests. Simply prompt:
Here is the exact multi-phase pipeline the agent executes based on the skill runbook: Automated Analysis and Data-Driven Transforms The agent leverages the built-in Dart toolchain fix runner:
This updates references and applies data-driven transform rules published inside materialui/lib/fixdata/. Dependency Configuration (pubspec.yaml) The agent ensures your project bounds satisfy the minimum SDK constraints (Flutter >=3.44.0, Dart ^3.12.0): Canonical Import Rewrites The agent replaces monolithic imports across all Dart files with the canonical entrypoints: Localization Delegate Binding Both materialui.dart and cupertinoui.dart export their respective global localization delegates without requiring extra legacy glue: Automated Verification & Quality Gate The agent finishes by running static analysis and tests to ensure no ambiguous symbol collisions or unresolved imports remain:
One of the greatest benefits of this decoupling is that Flutter apps with custom enterprise design systems can now completely omit materialui and cupertinoui.
By building directly against package:flutter/widgets.dart, you can create a lightweight, high-performance UI layer with zero design system bloat:
The split package architecture is a major milestone for Flutter's scalability and modularity. By equipping your AI development workflow with dart-sdk-skills, you turn what could be a tedious manual refactor into an effortless, one-command migration.
🌟 GitHub Repository: github.com/RandalSchwartz/dart-sdk-skills 📦 materialui on Pub: pub.dev/packages/materialui 🍏 cupertinoui on Pub: pub.dev/packages/cupertinoui