Controlled A/B tests for agent SKILL.md files: blind grading, bootstrap confidence intervals, HELPS/PLACEBO/HARMS - effect size, not schema validation.

## Installation

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

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

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).

Unified interfaces for common platform-specific services

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

size effect for mofron

Platform specific implementations for the Node.js runtime

Ponyfill of the experimental `React.useEffectEvent` hook

Create components whose prop changes map to a global side effect

Create components whose prop changes map to a global side effect

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

Functions for power analysis calculations.

React Doctor rules for oxlint.

Functional programming in TypeScript

Effect-TS is a zero dependency set of libraries to write highly productive, purely functional TypeScript at scale.

Effect-TS is a zero dependency set of libraries to write highly productive, purely functional TypeScript at scale.

Experimental modules for the Effect ecosystem

A set of helpers for testing Effects with vitest