Effect

[](https://pkg.pr.new/~/Effect-TS/effect)

# Effect

Effect is a library for building robust, maintainable, type-safe, and production grade applications in TypeScript. It helps you handle the hard problems at scale: typed errors, dependency injection, structured concurrency, scheduling, tracing, and unified schema validation.

> **Effect 4.x is a long-term support (LTS) release.** If you are upgrading from Effect 3.x, follow the [migration guide](MIGRATION.md).

## Installation

```sh
npm install effect
```

## Requirements

- **TypeScript 5.9 or newer.** TypeScript 7 is recommended for the best performance and compatibility with [Effect's TypeScript tooling](https://github.com/Effect-TS/tsgo#installation).
- **Node.js 22.19 or newer** is the general minimum for running Effect on Node.js.
- **Strict type-checking:** the `strict` flag must be enabled in your `tsconfig.json`.

## Links

- [Website](https://effect.website): documentation, guides, and news
- [Discord](https://discord.gg/effect-ts): ask questions, share what you're building, and talk to the core team
- [Community](https://effect.website/community-hub): meetups and events, or bring Effect to your own
- [Issues](https://github.com/Effect-TS/effect/issues): bug reports and feature requests
- [Jobs](https://effect.website/effect-jobs): companies hiring Effect developers
- Follow us on [X](https://x.com/EffectTS_), [Bluesky](https://bsky.app/profile/effect-ts.bsky.social), and [LinkedIn](https://www.linkedin.com/company/effect-ts)

## Let's talk

Whether your team is considering Effect, rolling it out, or already running it in production, we'd love to hear from you: what you're building, what works, and what you need from Effect next.

- **Talk to the maintainers.** Introduce your team on [Discord](https://discor