Swift Composable Architecture

What it does

This skill enables AI agents to assist developers in writing Swift code using The Composable Architecture (TCA) by Point-Free. It provides expertise on TCA principles and patterns, helping users create correct, testable, and composable frontend applications. The skill focuses on guiding development through the core concepts of TCA: unidirectional data flow, state as value types, explicit effects, composition over inheritance, and a focus on testability.

When to use it

• When designing the architecture for a new Swift frontend application.
• To help write reducers that evolve state based on actions and effects.
• For assistance in structuring features with states, actions, reducers, and stores according to TCA principles.
• To understand how to connect a store of a feature to its corresponding view.

Key capabilities

• Expertise in The Composable Architecture (TCA) principles.
• Guidance on unidirectional data flow (Action → Reducer → State → View).
• Assistance with defining state as equatable value types.
• Help with managing side effects using Effect values within reducers.
• Support for composing small, isolated modules instead of relying on inheritance.
• Guidance on writing testable code using TestStore.

Example prompts

• "How can I structure a TCA feature to fetch data from an API?"
• "Explain the purpose of @CasePathable in TCA actions."
• "Can you help me write a reducer that handles user input and updates state?"
• "What is a TestStore and how do I use it to test my TCA feature?"

Tips & gotchas

• This skill assumes familiarity with basic Swift programming concepts.
• The skill focuses specifically on The Composable Architecture; it won't provide guidance for other architectural patterns.
• To get the most out of this skill, clearly describe your desired outcome and the specific TCA components you are working with (State, Action, Reducer, Store).