What is the primary purpose of Effect Layers and Services?

They are used for Dependency Injection (DI) and application composition, allowing you to define service interfaces and swap implementations easily.

Does it require internet access for documentation?

No, it is designed to prioritize searching your local Effect source code to provide implementation patterns that match your project's specific version.

How does this skill handle testing?

It provides specific patterns for switching between Live and Test layers, enabling developers to mock infrastructure like databases or HTTP clients during tests.

Where should I compose my application layers?

The skill follows the best practice of composing layers at the 'app boundary' (the entry point), keeping individual handlers unaware of the wiring logic.

Can this skill help with circular dependencies?

Yes, it includes guidance on module splitting and providing dependencies from the application root to prevent and resolve circularity issues.

Effect Layers & Services

Name: Effect Layers & Services
Author: mepuka

bymepuka

0•

API Development

Architects modular TypeScript applications using Effect-TS dependency injection and service composition patterns.

This skill enables Claude to manage complex application architectures using the Effect library's Service and Layer primitives. It provides a structured approach to defining service interfaces, implementing modular layers, and composing dependencies at the application boundary. By utilizing dependency injection (DI) patterns, it allows for seamless switching between live and test environments, resolves circular dependencies, and ensures infrastructure like loggers and databases are wired correctly. The skill specifically leverages local source code inspection to ensure implementations align with the exact version of Effect being used in the project.

Key Features

01Compose application infrastructure via Layer.merge and Layer.provide

02Resolve complex circular dependency patterns in modular TypeScript apps

03Define service interfaces and implementations using Effect.Service

04Manage scoped resources and application lifecycle through layers

05Implement environment-based switching between live and test implementations

060 GitHub stars

Use Cases

01Mocking external APIs and databases for unit and integration testing

02Centralizing application configuration and infrastructure wiring

03Setting up a production-ready DI container for backend services

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add mepuka/crate effect-layers-services

For use in Claude.ai and ChatGPT

Download Skill