flutter-concurrency

SKILL.md

Background JSON parsing and state management for jank-free Flutter UI rendering.

Provides decision tree for choosing between manual serialization (dart:convert) and code generation (json_serializable) based on model complexity

Supports three concurrency strategies: main-thread async/await for small payloads, short-lived Isolate.run() for heavy one-off computations, and long-lived isolates with ReceivePort/SendPort for continuous two-way communication

Includes platform-aware fallback: uses compute() for Flutter Web since dart:isolate threading is unsupported

Demonstrates integration with FutureBuilder for responsive UI state binding and enforces key constraints like no UI access in isolates and immutable message passing

Flutter Concurrency and Data Management

Goal

Implements advanced Flutter data handling, including background JSON serialization using Isolates, asynchronous state management, and platform-aware concurrency to ensure jank-free 60fps+ UI rendering. Assumes a standard Flutter environment (Dart 2.19+) with access to dart:convert, dart:isolate, and standard state management paradigms.

Decision Logic

Use the following decision tree to determine the correct serialization and concurrency approach before writing code: