redux-extendable-reducer
Redux reducer capable of lazily extending itself. Useful for large single page applications that utilize bundle splitting.
NOTE: formally redux-injectable-reducer
Install
npm install --save redux redux-extendable-reducer
Usage
import { createStore } from 'redux';
import rootReducer, { extendReducer } from 'redux-extendable-reducer';
const countReducer = (state = 0, action) => {
if (action.type === 'INCREMENT_COUNT') return state + 1;
return state;
};
const incrementCount = () => ({ type: 'INCREMENT_COUNT' });
const store = createStore(rootReducer);
store.dispatch(incrementCount());
console.log(store.getState().count); // undefined
store.dispatch(extendReducer({ count: countReducer }));
console.log(store.getState().count); // 0
store.dispatch(incrementCount());
console.log(store.getState().count); // 1
with React
import React, { Component } from 'react';
import ReactDOM from 'react-dom';
import PropTypes from 'prop-types';
import { Provider, connect } from 'react-redux';
import { createStore } from 'redux';
import rootReducer, { extendReducer } from 'redux-extendable-reducer';
const countReducer = (state = 0, action) => {
if (action.type === 'INCREMENT_COUNT') return state + 1;
return state;
};
const incrementCount = () => ({ type: 'INCREMENT_COUNT' });
class App extends Component {
static propTypes = {
count: PropTypes.number,
extendReducer: PropTypes.func.isRequired,
incrementCount: PropTypes.func.isRequired,
};
componentWillMount() {
this.props.extendReducer({ count: countReducer });
}
componentDidMount() {
this.interval = setInterval(() => {
this.props.incrementCount();
}, 1000);
}
componentWillUnmount() {
clearInterval(this.interval);
}
render() {
return <span>{this.props.count}</span>;
}
}
const ConnectedApp = connect(
state => ({ count: state.count }),
{ extendReducer, incrementCount }
)(App);
const store = createStore(rootReducer);
ReactDOM.render(
<Provider store={store}>
<ConnectedApp />
</Provider>,
document.getElementById('root')
);