Start Debugging

Tag: dart

61 posts · Page 5 of 7

2026-05-28 dart flutter mcp

The Dart and Flutter MCP server: one command to give Claude Code your running Flutter app

Dart 3.12 ships dart mcp-server, the official MCP bridge into the Dart and Flutter toolchain. Register it once in Claude Code, Cursor, or Codex CLI and your agent gets hot reload, pub.dev search, and live widget introspection without copy-pasting a DTD URI.

2026-05-27 comparison dart flutter

Dart records vs Freezed classes: which should you pick in 2026?

Pick Dart 3.12 records for ephemeral, locally-shaped data with no methods, and Freezed 3.x classes for named domain models that need copyWith, sealed unions, JSON serialization, or any behaviour.

2026-05-25 dart flutter

Dart 3.12 Drops the Initializer List for Private Fields

Dart 3.12 lets constructors initialize private fields directly with named parameters, killing one of the language's most persistent boilerplate patterns.

2026-05-19 dart flutter firebase

Cloud Functions for Firebase Now Speaks Dart (Experimental)

Firebase shipped experimental Dart support for Cloud Functions on May 6, 2026. HTTPS and callable triggers, AOT-compiled cold starts, and the Firebase CLI handles compilation.

2026-05-17 errors dart flutter

Fix: Unhandled Exception: FormatException: Unexpected character when parsing JSON in Dart

The fix in 30 seconds: your response body is not the JSON you think it is. Print the raw bytes, decode with utf8.decode(response.bodyBytes), and never feed an HTML error page or a BOM-prefixed string to jsonDecode.

2026-05-17 errors flutter dart

Fix: Version solving failed in pubspec.yaml

The fix in 30 seconds: read the 'because' chain in the error, find the one constraint that boxes pub in, and either widen it or add a dependency_overrides entry. Do not start with flutter clean.

2026-05-16 errors flutter dart

Fix: A RenderFlex overflowed by N pixels in Flutter

The fix in 30 seconds: wrap the offending child in Expanded or Flexible. Then read the rest to learn why Row and Column do not clip, what unbounded constraints actually mean, and which fix is right for each layout.

2026-05-16 flutter dart swiftpm

Flutter 3.44 Splits Material and Cupertino Out of the SDK and Defaults to SwiftPM

Flutter 3.44 stable freezes Material and Cupertino inside the SDK and points new work at the material_ui and cupertino_ui packages on pub.dev. SwiftPM also becomes the default for iOS and macOS, finally retiring CocoaPods.

2026-05-06 flutter dart riverpod

How to migrate a Flutter app from GetX to Riverpod

Step-by-step migration from GetX to Riverpod 3.x in a real Flutter app: GetxController to Notifier, .obs to derived providers, Get.find to ref.watch, Get.to to go_router, plus snackbars, theming, and tests. Tested on Flutter 3.27.1, Dart 3.11, flutter_riverpod 3.3.1.

2026-05-06 flutter dart devtools

How to profile jank in a Flutter app with DevTools

Step-by-step guide to finding and fixing jank in Flutter 3.27 with DevTools: profile mode, the Performance overlay, the Frame Analysis tab, the CPU Profiler, raster vs UI thread, shader warm-up, and Impeller-specific gotchas. Tested on Flutter 3.27.1, Dart 3.11, DevTools 2.40.