Why use this?

TL:DR; Dynamically load components and reducers into your app and redux store, whilst taking advantage of code-splitting to reduce your app's load time.

As apps become larger, it becomes more and more of a challenge to organise your code in to simple logical parts. This is especially true with redux and react.

This package aims to help resolve some of this complexity by allowing developers to split their code into distinct separate parts, each with access to the global redux store, but with the ability to register their components and reducers when they are required by the user. This is done using webpack's dynamic imports and redux's replaceReducer functionality.

Installation

$ npm install dynamic-redux-imports

Demo

Here's a working example.

Usage

// app.js
import {Module, createDynamicStore} from 'redux-dynamic-imports'
import { Provider } from "react-redux";

const store = createDynamicStore(reducers, initialState, applyMiddleware);

const App = () => (
    <Provider store={store}>
        <Module resolve={() => import("./my-module")} />
    </Provider>
)

ReactDOM.render(App, document.getElementById('root'))

// my-module
const MyComponent =  connect()(() => <div>some component</div>)

const myReducers = {
    noop: (state = {}, action) => state
}

export default {
    view: MyComponent,
    reducers: myReducers,
    name: 'myModule',
}

module structure

Each module should have it's own component(s), reducers, actions etc. These should be exported using the following structure.

const MyComponent =  connect()(() => <div>some component</div>)

const myReducers = {
    count: (state = {}, action) => state
}

export default {
    view: MyComponent,
    reducers: myReducers,
    name: 'myModule',
}

API

Module

<Module resolve={() => import('path/to/module')} foo="bar" />

Renders the view component from path/to/module and registers reducers from module with the redux store.

Also note that any outside of the API will be passed down to the imported component.

Argument	Type	Requried	Description
resolve	Function	true	A function that wraps the import method e.g. () => import("path/to/module"). This should be a closure to make the import load lazily.
loading	React Component	false	Content that should be rendered whilst the module is bieng loadedContent that should be rendered whilst the module is bieng loaded.

createDynamicStore

createDynamicStore(reducerDictionary, preloadedState, enhancer)

Returns a redux store that holds the state of your app. The store itself with have two additionaly methods addModule and removeModule that allow for new reducers to be dynamically added or removed from the store.

The only difference between createDynamicStore and redux's createStore is that the first argument should be a dictionary of reducers for your store. Other than that createDynamicStore works in exactly the same was as redux's createStore. See redux documentation for more detail..

const fooReducer = (state, action) => Object.assign({}, state, action.payload)
const someReducer = (state, action) => Object.assign({}, state, action.payload)

const reducerDictionary = {
    foo: fooReducer
}

const store = createDynamicStore(reducerDictionary, preloadedState, enhancer)

store.addModule({name: 'foo', reducers: someReducer})
store.removeModule('foo')

Argument	Type	Requried	Description
reducerDictionary	Object	false	An object with properties that return a reducer.
preloadedState	Object	false	The initial state of your store. See details from redux docs
enhancer	Function	false	A redux store enhancer. See details from redux docs

store.addModule

const store = createDynamicStore(reducerDictionary, preloadedState, enhancer)
store.addModule({name: 'foo', reducers: someReducer})

When actions are handled by these reducers, the stores state will be updated under the namespace of foo e.g.

Apps state

{
    foo: {
        ... modules state
    }
}

Argument	Type	Requried	Description
name	String	true	Unique identifier that will be used to register state for reducers.
reducers	Function or Object	true	Either a reducers function or a dictionary of reducer functions.

store.removeModule

store.removeModule('foo')

Argument	Type	Requried	Description
name	String	true	Unique identifier of reducers that you want to remove from the store. Note also that this doesn't destroy the state associated with the reducers, it simply unregisters the stores for this given module. New reducers can be added later under the same name to continue working with the same piece of state.