@reatom/react-v2

React bindings package for Reatom store.

Reatom is declarative and reactive state manager, designed for both simple and complex applications. See docs.

Install

npm i @reatom/react-v2

or

yarn add @reatom/react-v2

@reatom/react-v2 depends on and works with @reatom/core-v2 and react. You should install this packages too.

Hooks Api

If you use React 16 or 17 you should setup batch bindings for React by yourself. Just import @reatom/react-v2/react-dom-batched-updates or @reatom/react-v2/react-native-batched-updates on the top (root) of your project to make it work before any hook call.

import '@reatom/react-v2/react-dom-batched-updates'

useAtom

Connects the atom to the store represented in context and returns the state of the atom from the store (or default atom state).

Basic (useAtom)

const [data] = useAtom(dataAtom)

Depended value by selector

const [propAtom] = useMemo(
  () => createAtom({ dataAtom }, ({ get }) => get('dataAtom')[props.id]),
  [props.id],
)
const [propValue] = useAtom(propAtom)

useAction

Binds action with dispatch to the store provided in the context.

Basic (useAction)

const handleUpdateData = useAction(dataAtom.update)

Prepare payload for dispatch

const handleUpdateData = useAction(
  (value) => dataAtom.update({ id: props.id, value }),
  [props.id],
)

Conditional dispatch

If action creator don't return an action dispatch not calling.

const handleUpdateData = useAction((payload) => {
  if (condition) return dataAtom.update(payload)
}, [])

Usage

Step 0 - OPTIONAL. Create store.

This step is required only for SSR, when one node.js process may handle a few requests at the time.

// App

import React from 'react'
import { createStore } from '@reatom/core-v2'
import { reatomContext } from '@reatom/react-v2'
import { Form } from './components/Form'

import './App.css'

export const App = () => {
  // create statefull reatomContext for atoms execution
  const store = createStore()

  return (
    <div className="App">
      <reatomContext.Provider value={store}>
        <Form />
      </reatomContext.Provider>
    </div>
  )
}

Step 1. Bind your atoms.

// components/Form

import { createPrimitiveAtom } from '@reatom/core-v2/primitives'
import { useAtom } from '@reatom/react-v2'

const nameAtom = createPrimitiveAtom('', {
  onChange: (state, e) => e.currentTarget.value,
})

export const Form = () => {
  const [name, { onChange }] = useAtom(nameAtom)

  return (
    <form>
      <label htmlFor="name">Enter your name</label>
      <input id="name" value={name} onChange={onChange} />
    </form>
  )
}

Step 3. You are gorgeous