README.md

Redux Dynamic Modules

What is it?

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

Motivation

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 a module, which contains reducers and middleware, and add it to the Redux store at runtime. We also provide a React component DynamicModuleLoader, 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

Features

• 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, including redux-saga and redux-thunk

Example Scenarios

• You don't want to load the code for all your reducers up front. Define a module for some reducers and use DynamicModuleLoader and a library like react-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

Install

Run

npm install redux-dynamic-modules

or

yarn add redux-dynamic-modules

Usage

• Create a module with the following format

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

• Create a ModuleStore

import { createStore, IModuleStore } from "redux-dynamic-modules";
import { getUsersModule } from "./usersModule";

const store: 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 the DynamicModuleLoader React component to add/remove modules when components mount/unmount

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

Extensions

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

Examples

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

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

Contributing

This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.microsoft.com.

When you submit a pull request, a CLA-bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.