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react hooks with xstate and redux
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| import React, { useState, useEffect, useMemo, useReducer, useContext, useCallback } from 'react' | |
| import { composeWithDevTools } from 'redux-devtools-extension' | |
| import { createStore } from 'redux' | |
| import { createSelector } from 'reselect' | |
| import { Provider, shallowEqual, useSelector, useDispatch } from 'react-redux' | |
| import { Machine, interpret, assign } from 'xstate' | |
| import ReactDOM from 'react-dom' | |
| const initialState = { | |
| counter: 0 | |
| } | |
| function reducer (state = initialState, action) { | |
| switch (action.type) { | |
| case 'increment': | |
| let { counter } = state | |
| counter += 1 | |
| return { ...state, counter } | |
| default: | |
| return state | |
| } | |
| } | |
| const toggleMachine = Machine({ | |
| initial: 'inactive', | |
| states: { | |
| inactive: { | |
| on: { | |
| TOGGLE: 'active' | |
| } | |
| }, | |
| active: { | |
| on: { | |
| TOGGLE: 'inactive' | |
| } | |
| } | |
| } | |
| }); | |
| const useMachine = machine => { | |
| const [state, setState] = useState(machine.initialState) | |
| const service = useMemo( | |
| () => { | |
| return interpret(machine).onTransition(delta => { | |
| if (delta.changed) { | |
| setState(delta) | |
| } | |
| }) | |
| .start() | |
| }, | |
| [] | |
| ) | |
| useEffect(() => { | |
| return () => { | |
| service.stop() | |
| } | |
| }, []) | |
| return [state, service.send] | |
| } | |
| const useInput = defaultValue => { | |
| const [value, setValue] = useState(defaultValue) | |
| return { | |
| value: value, | |
| setValue, | |
| bind: { | |
| value, | |
| onChange: (e) => { | |
| setValue(e.target.value) | |
| } | |
| } | |
| } | |
| } | |
| const selectCounter = createSelector( | |
| state => state.counter, | |
| counter => counter | |
| ) | |
| function Root () { | |
| const counter = useSelector(selectCounter, shallowEqual) | |
| const [machine, send] = useMachine(toggleMachine) | |
| const dispatch = useDispatch() | |
| const action = useCallback( | |
| () => { | |
| dispatch({type: 'increment'}) | |
| send('TOGGLE') | |
| }, | |
| [dispatch]) | |
| return ( | |
| <div> | |
| <div>{ counter }</div> | |
| <button onClick={action}>Toggle - {machine.toStrings()[0]}</button> | |
| </div> | |
| ) | |
| } | |
| const store = createStore(reducer, composeWithDevTools()) | |
| const $root = document.getElementById("react-root") | |
| ReactDOM.render(<Provider store={store}><Root /></Provider>, $root) |
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