The missing standard library for TypeScript, for writing production-grade software.

## Installation

Create components whose prop changes map to a global side effect

Create components whose prop changes map to a global side effect

Ponyfill of the `React.useEffectEvent` hook, which became stable in React 19.2

A React helper hook for scheduling a layout effect with a fallback to a regular effect for environments where layout effects should not be used (such as server-side rendering).

A React hook that uses useEffect() on the server and useLayoutEffect() in the browser

A component that renders a native glass effect view on iOS.

Semantic session durability checkpoints before model requests and tool side effects

Platform specific implementations for the Node.js runtime

A wrapper package that uses `useInsertionEffect` or a fallback for it

Unified interfaces for common platform-specific services

A set of helpers for testing Effects with vitest

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Effect Language Service for TypeScript-Go — Effect-specific diagnostics and hover features.

It's react's useEffect hook, except using deep comparison on the inputs, not reference equality

Functional programming in TypeScript

Platform specific implementations for the Bun runtime

OpenTelemetry integration for Effect

A PostgreSQL toolkit for Effect