A Swift library for building applications with a focus on composition, testing, and ergonomics using a unidirectional data flow architecture.
The Composable Architecture (TCA) is a Swift library for building applications using a unidirectional data flow pattern. It provides tools for managing state, handling side effects, and composing features in a way that prioritizes testability and maintainability. It solves the problem of scattered logic and unpredictable state mutations in complex apps by enforcing a consistent structure.
Swift developers building applications for iOS, macOS, iPadOS, visionOS, tvOS, or watchOS who need a scalable and testable architecture for medium to large projects.
Developers choose TCA for its strong emphasis on testing, seamless composition of features, and ergonomic API that reduces boilerplate. Its integration with Swift's concurrency model and dependency management system makes it a robust choice for production apps.
A library for building applications in a consistent and understandable way, with composition, testing, and ergonomics in mind.
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Enforces predictable state mutations through actions and reducers, simplifying debugging. The README highlights this as a core philosophy for consistency across platforms.
Facilitates unit, integration, and end-to-end tests with mocked dependencies using TestStore. The README includes detailed examples of testing async effects and state changes.
Allows breaking large features into smaller, isolated modules that can be combined. This is emphasized in the README as key for scalability and maintainability.
Provides a built-in system for handling side effects with DependencyKey and @Dependency, making code testable. The README shows how to mock APIs for deterministic tests.
Requires defining State, Action, Reducer, and Store for every feature, adding overhead compared to vanilla SwiftUI. The README admits it's 'a few more steps' for basic usage.
Assumes familiarity with functional programming concepts like reducers and effects, with a steep initial curve. The extensive documentation and FAQ indicate it's not a drop-in solution.
Heavily integrates with Point-Free's dependency management and companion libraries, which may limit flexibility with third-party tools. The README lists community libraries but notes they are extensions of TCA.