What is a Context Tag in this framework?

A Context Tag is a unique, type-safe identifier used to represent a service requirement within an Effect, ensuring that the compiler can verify dependencies are met.

What is the primary benefit of using Layers in Effect?

Layers provide a modular way to describe how services are constructed and how they depend on one another, enabling automatic dependency resolution and lifecycle management.

How does this skill handle resource cleanup?

It utilizes Layer.scoped and finalizers to ensure that resources like database connections or file handles are properly closed when the application or scope finishes.

Can I use this skill to improve my unit testing?

Absolutely. It demonstrates how to create test-specific layers that mock external dependencies, allowing you to test business logic in isolation without actual network or database calls.

Effect Dependency Injection

Name: Effect Dependency Injection
Author: TheBushidoCollective

byTheBushidoCollective

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API Development

Manage complex dependency graphs and service lifecycles in Effect-based TypeScript applications using type-safe Context and Layers.

This skill empowers developers to master the powerful dependency injection system within the Effect ecosystem. It provides comprehensive patterns for defining services with Context.Tag, constructing blueprints with Layers, and composing complex dependency graphs using horizontal and vertical composition. By leveraging these patterns, developers can build highly modular, testable, and maintainable applications with built-in support for resource management (scoped layers) and seamless environment swapping for unit testing or local development.

Key Features

01Horizontal and vertical layer composition via merge and provide

02Type-safe service definitions using Context.Tag and GenericTag

03Implementation of Repository and Service Facade architectural patterns

04Simplified testing workflows through dependency mocking and environment provision

05Resource management and cleanup with scoped layers and finalizers

0695 GitHub stars

Use Cases

01Managing resources that require explicit initialization and teardown, such as database connection pools

02Decoupling business logic from infrastructure concerns like databases and external APIs

03Creating isolated testing environments by swapping live services with in-memory or mock implementations

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add thebushidocollective/han effect-dependency-injection

For use in Claude.ai and ChatGPT

Download Skill