a redux-like library for managing state with simpler api (1kb)
redux is awesome, but is not enough simple for small and middle application.
With relite
, we don't need to combine | apply | bind
anything, just write pure function and call actions, it done.
npm install --save relite
the action of relite
looks like a reducer of redux, but more simple and powerful.
/**
* an action consist of action-type, action-payload, action-handler and action-result
* at this example
* action-type is EXEC_BY
* action-handler is the function accepts two arguments: state and action-payload
* action-result is the result of function
*/
export let EXEC_BY = (state, input) => {
let value = parseFloat(input, 10)
return isNaN(value) ? state : {
...state,
count: state.count + value
}
}
relite
support async action, works like build-in redux-promise
and redux-thunk
/**
* when action-handler return a promise, it will call updateState at promise.then
* use async/await syntax will be better for handling async action
*/
export let EXEC_ASYNC = async (state, input) => {
await delay(1000)
return EXEC_BY(state, input) // use the state accepted by EXEC_ASYNC, it maybe out of time
}
export let EXEC_ASYNC = async (state, input) => {
await delay(1000)
return EXEC_BY // use current state
}
// promise-style
export let EXEC_ASYNC = (state, input) => {
return delay(1000, EXEC_BY)
}
function delay(timeout = 0, value) {
return new Promise(resolve => {
setTimeout(() => resolve(value), timeout)
})
}
relite
support three kinds of action-result: nextState, promise and action-handler
- if action-handler return promise,
relite
call updateState on promise.then - if action-handler return function,
relite
handle it as a new action-handler and call it with state and current action-payload - other value return by action-handler is named
nextState
,relite
will call updateState immediately - you can nest all of three kinds action-result mentioned above in action-handler
import { createStore } from 'relite'
import * as actions from './actions'
let initialState = {
count: 0,
}
let store = createStore(actions, intialState)
/*
* relite will bind state for every actions you gave to `createStore`
* so all the functions in store.actions can only accept one argument, action-payload
* no need to bindActionCreators
* each actions return currentState or promise with currentState
*/
let { INCREMENT, EXEC_BY } = store.actions
INCREMENT() // -> { count: 1 }
EXEC_ASYNC(9) // -> Promise[[{ count: 10 }]]
/**
* subscribe store by store.subscribe
* when the state was changed/updateed, relite would trigger the listeners
* if action-handler return the same state, listeners would not be triggered
*/
let unsubscribe = store.subscribe((data) => {
let {
actionType, // action-type
actionPayload, // action-payload
start, // start date
end, // end date
previousState, // prev-state
currentState // cur-state
} = data
})
let newState = {
count: 0,
}
let simulateData = {
actionType: 'REPLACE_STATE',
actionPayload: null,
start: new Date(),
end: new Date,
previousState: store.getState(), // get current state
currentState: newState,
}
let keepSilent = false // if true, it will not trigger listeners
// replace state by store.replaceState
store.replaceState(newState, simulateData, false)
// trigger listener by store.publish
store.publish(simulateData)
store.dispatch('EXEC_ASYNC', 10) // dispatch the action manually
import { createStore, createLogger } from 'relite'
import * as actions from './actions'
let initialState = {
count: 0,
}
let store = createStore(actions, intialState)
let logger = createLogger({
name: 'logger-name',
})
store.subscribe(logger)
store.subscribe(render)
render()
function render() {
ReactDOM.render(
<App {...store.getState()} {...store.actions} />,
document.getElementById('container')
)
}
Issue and pull request is welcome!