First, a WordPress REST API should be created to handle requests from the app. Then a Redux Store should be created using Redux Toolkit. We can create a redux store without Redux Toolkit. But we have to use a lot of boilerplate code. Middleware can be used to intercept the dispatched actions before reaching the store. Middleware can also dispatch additional actions if necessary. Let's create 3 simple middleware. Finally, let's write some tests with Jest for the store implementation.
npm install --save-dev webpack webpack-cli
npm install --save-dev sass-loader sass style-loader css-loader
npm install --save-dev babel-loader @babel/core @babel/preset-env @babel/preset-react @babel/plugin-transform-runtime
npm install --save react react-dom bootstrap
npm i --save-dev jest @types/jest axios-mock-adapter babel-jest
npm i @reduxjs/toolkit redux-devtools-extension reselect
