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.

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

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

A reactive atomic state engine for React(including React 18) and all React like, carrying dependency collection feature, supporting fine-grained updates.

Type-safe, ergonomic, polymorphic optics for TypeScript

The vibe coding database runs in the browser, fits in the context window, and syncs anywhere.

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

🎨 Easy color manipulation in ~2kb (gzipped)

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.

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

🇨🇭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

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

A React hook for state time travel with undo, redo, reset and archive functionalities.