typescript:functional-patterns

What problem does it solve?

Model and enforce safe, reliable domain logic in TypeScript using ADTs, Option/Result, and branded types.

Core Features & Use Cases

• Discriminated unions and Algebraic Data Types for exhaustive state modeling
• Option and Result types for explicit error handling and nullable values
• Branded types for domain invariants (IDs, units, and validated values)
• Practical guidance for pattern usage in real-world scenarios such as state machines, configuration parsing, and safe migrations

Quick Start

Create a small TypeScript example showing a discriminated union and an exhaustive switch to model a simple traffic-light state.