Simple State Management
Easy-to-use createState and createReducer similar to React
useState / useReducer for global state.
SynState
A lightweight, high-performance state management library for TypeScript/JavaScript. Simple global state that scales to complex async pipelines — with built-in debounce, switchMap, and more. Fully compatible with React Compiler.
Features
Section titled “Features”High Performance
Glitch-free O(n) propagation — up to 30× faster than Jotai and 16× faster than Redux. See benchmarks.
Lightweight
~4.5 kB min+gzip with only one external runtime dependency.
Built-in Async Operators
debounce, throttle, switchMap, and more — handle complex async
flows in a unified, declarative API without external libraries.
React-Optimized
Fully compatible with React Compiler. synstate-react-hooks lets you
add global state to any component in just a few lines.
Framework Agnostic
Core library works as-is with vanilla JavaScript, Vue, Svelte, or any framework. For React and Preact, hooks wrappers are available. For Preact, a Preact Signals integration is also provided.