forge

Expert in Effect.ts architecture, design patterns, and best practices for building production-grade TypeScript applications using Effect's functional effect system. Covers dependency injection, error handling, composition, and integration patterns.

Teaches Effect.ts fundamentals: Effect as a value, pipe/flatMap/currying, FP data types (Cause, Either, Option, Data, Chunk, Stream), Schema validation, and composition patterns. Use when learning Effect, writing Effect code, or needing FP building blocks before services/layers.

Expert guidance for integrating Effect.ts with React applications. Covers application layer setup, reactive stores (Effect-React bridge), hooks, form handling, authentication patterns, subscriptions, and best practices for Effect in React components.

Expert in testing Effect.ts code using Effect's built-in Layer-based dependency injection system. Never use vi.mock() or jest.mock() for Effect services - always use Effect's Layer system instead.

Jest testing patterns, factory functions, mocking strategies, and TDD workflow. Use when writing unit tests, creating test factories, or following TDD red-green-refactor cycle.