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redux-async-initial-state
Advanced tools
It is simple redux middleware that helps you load redux initial state asynchronously
Redux middleware for async loading of initial app state.
npm install --save redux-async-initial-state
With redux it is quite simple to synchronously load initial state, i.e. from localStorage:
...
const initialState = JSON.parse(localStorage.getItem('state'));
const store = storeCreator(reducer, initialState);
But it becomes quite complicated to do it asynchronously, i.e. from server or from async storage, like in React Native. This middleware do it for you.
npm install --save redux-async-initial-state
before:
import { createStore, combineReducers } from 'redux'
import * as reducers from 'reducers'
const reducer = combineReducers(reducers)
const store = createStore(reducer)
After
import { createStore, applyMiddleware, combineReducers, compose } from 'redux';
import * as reducers from 'reducers';
import * as asyncInitialState from 'redux-async-initial-state';
// We need outerReducer to replace full state as soon as it loaded
const reducer = asyncInitialState.outerReducer(combineReducers({
...reducers,
// We need innerReducer to store loading state, i.e. for showing loading spinner
// If you don't need to handle loading state you may skip it
asyncInitialState: asyncInitialState.innerReducer,
}));
// Load state function
// Should return promise that resolves application state
const loadStore = () => {
return new Promise(resolve => {
fetch('/store')
.then(response => response.json())
.then(resolve);
});
}
const store = createStore(
reducer,
compose(applyMiddleware(asyncInitialState.middleware(loadStore)))
);
In case when you're loading only part of your store initially, you can add currentState
argument in loadStore
function. So, if you have some complex shape of your reducer and you need to replace only some of keys in your store (currentUser
in example below):
const loadStore = (currentState) => {
return new Promise(resolve => {
fetch('/current_user.json')
.then(response => response.json())
.then(user => {
resolve({
// reuse state that was before loading current user
...currentState,
// and replace only `currentUser` key
currentUser: user
})
});
});
}
The shape of innerReducer
is:
{
loaded: false,
loading: false,
error: false
}
You can add it to you reducer if you want to handle loading state, i.e. to show loading spinner. Here is React example (it uses reducer, described above):
import React from 'react';
import { connect } from 'react-redux';
@connect(state => ({
loading: state.asyncInitialState.loading,
}))
class MyComponent extends React.Component {
render() {
if (this.props.loading) {
return <div>Loading...</div>
}
return ...;
}
}
FAQs
It is simple redux middleware that helps you load redux initial state asynchronously
The npm package redux-async-initial-state receives a total of 7,748 weekly downloads. As such, redux-async-initial-state popularity was classified as popular.
We found that redux-async-initial-state demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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