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Bloc State Management Rules

A convention playbook for designing, implementing, and testing Cubits and Blocs in Flutter with bloc/flutter_bloc.

Dev & CodingIntermediate★ 617⑂ 59AI score 9/10Last updated: Aug 21, 2026

What it does

  • Gives a clear decision table for Cubit vs Bloc (simple state → Cubit; event traceability, debounce/throttle → Bloc with transformers).
  • Enforces naming conventions (past-tense events, noun states) and explains when to model state as a sealed class hierarchy versus a single class with a status enum.
  • Codifies Equatable/@immutable/copyWith rules, a lookup table for BlocProvider, BlocBuilder, BlocListener, BlocConsumer, BlocSelector, and the three-layer boundary (Presentation → Bloc → Repository → DataProvider).
  • Ships ready-to-copy bloc_test + mocktail test templates plus a pitfalls table (duplicate emissions, missing props, logic in widgets).

Who it's for

  • Flutter developers and teams standardizing on the bloc architecture.
  • Tech leads who want consistent conventions and review criteria.
  • Anyone who wants Claude Code to generate idiomatic Cubit/Bloc code every time.

Examples

  1. "Create a Cubit for the login feature" → produces a status-enum state class with copyWith and a proper loading/success/failure emit flow.
  2. "Refactor this screen from setState to bloc" → moves logic into a Cubit and rewires the UI with BlocBuilder plus BlocListener for snackbars/navigation.
  3. "Write tests for LoginCubit" → generates blocTest cases asserting emitted state sequences for both success and thrown-exception paths.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/evanca/flutter-ai-rules/HEAD/skills/bloc/SKILL.md

What I want: (describe your task here)

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↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

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Install the skill I found on Claude Skill Mart.
Copy the skills/bloc folder from the GitHub repo evanca/flutter-ai-rules into my ~/.claude/skills/bloc/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/evanca/flutter-ai-rules.git && mkdir -p ~/.claude/skills && cp -r flutter-ai-rules/skills/bloc ~/.claude/skills/bloc

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open a terminal and clone the repo: git clone https://github.com/evanca/flutter-ai-rules.git
  2. Create the skills directory if needed: mkdir -p ~/.claude/skills
  3. Copy just this skill: cp -r flutter-ai-rules/skills/bloc ~/.claude/skills/bloc
  4. Verify that ~/.claude/skills/bloc/SKILL.md exists.
  5. Restart Claude Code; the skill activates automatically when you ask for Cubit/Bloc work in a Flutter project.
  6. Make sure your pubspec.yaml includes flutter_bloc and equatable (plus bloc_test and mocktail for tests) so the sample code compiles as-is.
View source on GitHub ↗License: MIT