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felangel/bloc

This system is a comprehensive state management library and ecosystem for Dart and Flutter applications, centered around the BLoC and Cubit patterns. It provides core packages for managing application state, handling side effects, and persisting data, alongside specialized packages for concurrency, testing, and linting. The repository also includes a wide array of example applications and code generation templates that demonstrate various architectural patterns, including form validation, infinite lists, and authentication flows.

48.9

Weak · 5 August 2026

18k

lines of production code

Dart

with TypeScript, Kotlin

1

bus factor · 261 authors in all

4

measurements over time

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How it got here

2018–2019 · BLoC ecosystem expansion and modernization

This period focused on modernizing the core BLoC library by removing legacy APIs and introducing new features like MultiBlocObserver. Simultaneously, the project expanded its ecosystem by releasing flutter_bloc and angular_bloc, while significantly growing the example repository with diverse Flutter, AngularDart, and VS Code/IntelliJ tooling.

39 changes

2020 · BLoC pattern adoption and test coverage

This period focused on standardizing the BLoC/Cubit pattern across all example applications, introducing state management implementations for login, counter, weather, and infinite list scenarios. Significant effort was also dedicated to comprehensive test coverage, adding unit and widget tests for all examples, alongside infrastructure improvements like web support and macOS plugin registration.

41 changes

2021–2022 · BLoC/Cubit ecosystem expansion and tooling

This period focused on expanding the BLoC/Cubit ecosystem with new concurrency transformers, CLI tooling, and code-generation bricks supporting multiple styles. It also involved modernizing example applications with comprehensive state management, declarative routing, and full test coverage.

38 changes

2023–2025 · Linting and platform support

This period focused on expanding the BLoC ecosystem with the introduction of the bloc_lint package to enforce best practices across the library. Additionally, the project improved web platform support by adding necessary entry points and manifests for various examples, while also establishing a baseline for iOS unit testing.

4 changes

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About this page

  • The description of this project is derived from its own commit history, not from its README.
  • The score is its highest published measurement, taken on 5 August 2026 at a pinned commit. It is not a live figure and does not change until the project is measured again.
  • Measured at commit a9b287fa42 — the exact code this score is about.
  • Scored under rubric rubric-2026.08.19. Score the same commit under that rubric and you get the same number.
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