factory-function-composition

Name: factory-function-composition
Availability: InStock
Author: Epicenter

Compose clients and services using factory functions with a two-argument signature.

4.7k|374|Updated Mar 16, 2023

Search Tags:#typescript #testability #factory #dependency-injection #design-pattern #service-composition

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npx skills add https://github.com/EpicenterHQ/epicenter --skill factory-function-composition

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: factory-function-composition
Source: https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/factory-function-composition
Command: npx skills add https://github.com/EpicenterHQ/epicenter --skill factory-function-composition

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This pattern helps developers enforce clear separation of concerns by injecting dependencies via factory functions, reducing hidden dependencies and improving testability.

Core Features & Use Cases

Enables creation of services with injected clients and resources
Supports multi-dependency factories and explicit option layering
Improves testability by enabling mocks and isolation
Use Case: When wiring together a client, a service, and its method options in a stable, predictable way

Quick Start

Create a service by wiring dependencies with a factory and call a method to exercise the resulting service.

Frequently Asked Questions about factory-function-composition

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I use factory functions for dependency injection in TypeScript?▼

Factory functions handle dependency injection by composing clients and services, enforcing a universal two-argument signature with resources first and configuration second to improve testability.

What is the best way to structure service composition for multiple layered dependencies?▼

Service composition for multiple layered dependencies is structured using multi-dependency factories and explicit option layering, keeping client creation independent of business logic.

Why does dependency injection improve testability in codebases with hidden dependencies?▼

Dependency injection improves testability by enabling mocks and isolation, reducing hidden dependencies so services can be created with injected clients and resources in a predictable way.

How do I mock services when wiring together a client and its method options?▼

Mocking services is done by using factory functions to wire clients and method options, allowing dependencies to be injected independently and easily mocked for testing.

Can I pass multiple dependencies and configuration options into a single factory function?▼

Yes, factory functions support multiple dependencies and explicit option layering through a universal two-argument signature, taking resources as the first argument and configuration as the second.