Create, calculate, and format money in JavaScript and TypeScript.

redux-immutable is used to create an equivalent function of Redux combineReducers that works with Immutable.js state.

🐆 An immutable list with unmatched performance and a comprehensive functional API.

Efficient immutable updates, 2-6x faster than naive handcrafted reducer, and more than 10x faster than Immer.

A reactive atomic state engine for React like.

Type-safe, ergonomic, polymorphic optics for TypeScript

A Javascript Membrane implementation using Proxies to observe mutation on an object graph

🎨 Easy color manipulation in ~2kb (gzipped)

Angular Model - Simple state management with minimalist API, one way data flow, multiple model support and immutable data exposed as RxJS Observable.

High-performance immutable data structures for modern JavaScript and TypeScript applications. Functional interfaces, deep/composite operations API, mixed mutability API, TypeScript definitions, ES2015 module exports.

Realtime database, runs anywhere. Install Fireproof in your front-end app or edge function, and sync data via any backend.

🇨🇭Switzerland takes a functional approach to Web Components by applying middleware to your components. Supports Redux, attribute mutations, CSS variables, React-esque setState/state, etc… out-of-the-box, along with Shadow DOM for style encapsulation and Custom Elements for interoperability.

A tiny, fast, unopinionated handler for updating JS objects and arrays immutably

Immutable timeseries data structures built with Typescript

Statically-typed structural-sharing tree modifier

Rimbu is a TypeScript library focused on immutable, performant, and type-safe collections and other tools.

A state management library for React combined immutable, mutable and reactive mode

The TypeScript Standard Library

🍃 Lightweight responsive state management solution.

A Mutative middleware for Zustand enhances the efficiency of immutable state updates.