redux-dynamic-modules is a library that aims to make Redux Reducers and middleware easy to modular-ize and add/remove dynamically.

In large Javascript applications, it is often desired to perform some kind of code-splitting, so that the initial script size is small. However, in Redux, you are required to define your reducers and middleware up-front; there is no good way to dynamically add/remove these constructs at runtime.

redux-dynamic-modules is designed to make dynamically loading these constructs easier. You can define amodule, which contains reducers and middleware, and add it to the Redux store at runtime. We also provide a React componentDynamicModuleLoader, which can load/unload modules on mount/unmount.

Modules provide the following benefits:

• Modules can be easily re-used across the application, or between multiple similar applications.
• Components declare the modules needed by them and redux-dynamic-modules ensures that the module is loaded for the component.
• Modules can be added/removed from the store dynamically, ex. when a component mounts or when a user performs an action

• Group together reducers, middleware, and state into a single, re-usable module.
• Add and remove modules from a Redux store at any time.
• Use the included<DynamicModuleLoader /> component to automatically add a module when a component is rendered
• Extensions provide integration with popular libraries, includingredux-saga andredux-thunk

• You don't want to load the code for all your reducers up front. Define a module for some reducers and useDynamicModuleLoader and a library likereact-loadable to download and add your module at runtime.
• You have some common reducers/middleware that need to be re-used in different areas of your application. Define a module and easily include it in those areas.
• You have a mono-repo that contains multiple applications which share similar state. Create a package containing some modules and re-use them across your applications

Run

npm install redux-dynamic-modules

or

yarn add redux-dynamic-modules

• Create a module with the following format

exportfunctiongetUsersModule():IModule<IUserState>{return{id:"users",reducerMap:{users:usersReducer,},// Actions to fire when this module is added/removed// initialActions: [],// finalActions: []};}

• Create aModuleStore

import{createStore,IModuleStore}from"redux-dynamic-modules";import{getUsersModule}from"./usersModule";conststore:IModuleStore<IState>=createStore({initialState:{/** initial state */},enhancers:[/** enhancers to include */],extensions:[/** extensions to include i.e. getSagaExtension(), getThunkExtension() */],},getUsersModule()/* ...any additional modules */);

• Use like a standard Redux store
• Use theDynamicModuleLoader React component to add/remove modules when components mount/unmount

<DynamicModuleLoadermodules={[getHelloWorldModule()]}><div>Hello World!!</div></DynamicModuleLoader>

• redux-saga -redux-dynamic-modules-saga
• redux-thunk -redux-dynamic-modules-thunk

See theWidgets for a quick of example of the library in practice.

Step by step walthrough of start consumingredux-dynamic-modules in the widget app.Youtube

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