Factory Function Composition

This skill helps you apply factory function patterns for clean dependency injection and function composition in TypeScript.

Related Skills: See method-shorthand-jsdoc for when to move helpers into the return object. See refactoring for caller counting and inlining single-use extractions.

When to Apply This Skill

Use this pattern when you see:

• A function that takes a client/resource as its first argument
• Options from different layers (client, service, method) mixed together
• Client creation happening inside functions that shouldn't own it
• Functions that are hard to test because they create their own dependencies

The Universal Signature

Every factory function follows this signature: