Effect TypeScript Best Practices

Effect is a TypeScript library for building complex, type-safe applications with structured error handling, dependency injection via services/layers, fiber-based concurrency, and resource safety.

When to Apply

• Writing or reviewing TypeScript code that imports from effect, @effect/schema, or @effect/platform
• Implementing typed error handling with Effect<Success, Error, Requirements>
• Building services and layers for dependency injection
• Working with Schema for data validation, decoding, and transformation
• Using fiber-based concurrency (queues, semaphores, PubSub, deferred)
• Processing data with Stream and Sink
• Migrating from Promises, fp-ts, neverthrow, or ZIO to Effect

How to Use

This skill is organized by domain. Read the relevant reference file for the area you're working in.