Layer Design Skill

Create layers that construct services while managing their dependencies cleanly.

Layer Structure

import { Layer } from "effect"

// Layer<RequirementsOut, Error, RequirementsIn>
//          ▲                ▲           ▲
//          │                │           └─ What this layer needs
//          │                └─ Errors during construction
//          └─ What this layer produces

Pattern: Simple Layer (No Dependencies)