Schema Composition Skill

Expert guidance for composing, transforming, and validating data with Effect Schema.

Core Concepts

The Schema Type

Every schema in Effect has the type signature Schema<Type, Encoded, Context> where:

• Type: The validated, decoded output type (what you get after successful decoding)
• Encoded: The raw input type (what you provide for decoding)
• Context: External dependencies required for encoding/decoding (often never)

Example:

import { Schema } from "effect"

// Schema<number, string, never>