Framework-agnostic state management library designed for simplicity and scalability

Get startedExamples

Simple primitives

xoid is based on atoms. Atoms are holders of state. create function is used to create them.

It has a Recoil-inspired API for derived atoms.

import { create } from 'xoid'
const atom = create(3)
console.log(atom.value) // 3
atom.set(5)
atom.update(state => state + 1)
console.log(atom.value) // 6
const derivedAtom = create(get => get(atom) * 2)

Actions

With the second argument, you can specify actions for your atoms.

import { create } from 'xoid'
const counterAtom = create(3, (atom) => ({
increment: () => atom.update((s) => s + 1),
incrementBy: (by) => atom.update((s) => s + by)
}))
counterAtom.actions.incrementBy(5)
setInterval(counterAtom.actions.increment, 1000)

React integration

xoid has a minimal React integration. No need for wrapping components into context providers. Just import useAtom and start using!

import { create } from 'xoid'
import { useAtom } from '@xoid/react'
// in a React component
const count = useAtom(counterAtom)
const { increment } = counterAtom.actions
// outside React
const unsubscribe = alpha.subscribe(console.log)

No more hand-written reducers!

There's the .focus method, which can be used as a selector/lens. xoid is based on immutable updates, so if you "surgically" set state of a focused branch, changes will propagate to the root.

import { create } from 'xoid'
const atom = create({ deeply: { nested: { alpha: 5 } } })
const previousValue = atom.value
// select `.deeply.nested.alpha`
const alpha = atom.focus(s => s.deeply.nested.alpha)
alpha.update(s => s + 1)
// root state is replaced with new immutable state
assert(atom.value !== previousValue) // ✅

No-API Finite State Machines!

No additional syntax is required to define and use finite state machines. Just use the second argument of the callback as the state transition function.

import { create } from 'xoid'
const red = { color: '#f00', onClick: () => machine.set(green) }
const green = { color: '#0f0', onClick: () => machine.set(red) }
const machine = create(red)
// in a React component
const { color, onClick } = useAtom(machine)
return <div style={{ color }} onClick={onClick}/>
  • Easy to learn
  • Small bundle size
  • Zero configuration
  • Framework-agnostic
  • Computed values
  • Async actions
  • Transient updates
  • Local & global state
  • Finite state machines
  • Extensive Typescript support
  • Devtools