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React - redux custom middleware demo

This is simple webpack 4 starter with scss enabled. I created it to test application of redux custom middleware. The custom middleware is in store folder middleware.js. The app uses 3 custom middlewares where one function returnes a promise. Custom middleware will intercept "ADD_PERSON" action and after async function is resolved will pass it to next middleware which will change action type from ADD_PERSON to PERSADD_PERSON_OK or ADD_PERSON_ERR.

NPM installation scripts

Just run npm install and all libs mentioned below will be installed.

  # 1. install webpack
  npm i webpack webpack-cli webpack-dev-server -D
  # 2. install react dom
  npm i react react-dom --save
  # 3. install babel loaders
  npm i babel-cli babel-loader babel-preset-react babel-preset-stage-2 -D
  # 4. install scss/css loaders 
  npm i node-sass sass-loader css-loader mini-css-extract-plugin -D
  # 5. install post css loader, autoprefixer 
  npm i postcss-loader autoprefixer -D
  # 6. install other webpack util plugins
  npm i html-webpack-plugin copy-webpack-plugin uglifyjs-webpack-plugin clean-webpack-plugin -D
  # 7. install testing suite Jest & Enzyme
  npm i -D jest babel-jest babel-preset-env enzyme enzyme-adapter-react-16
  # 8. install redux
  npm i -S redux react-redux

NPM scripts

  • npm start: start webpack in watch mode passing dev environment (--env=dev).
  • npm run dev: start webpack-dev-server using dev environment (--env=dev)
  • npm run build-dev: Build development version.
  • npm run build-prod: Build production version to dist folder. Note that previous build will be removed first.
  • npm test: to run tests with Jest & Enzyme

Webpack config scripts

Webpack configuration is stored in webpack folder. Initially 2 separate def files are created. Based on --env parameter passed on init one of the configuration files is loaded as webpack config module (see webpack.config.js)

  • dev: this is development environment setup (webpack/dev.js)
  • prod: this is production build setup (webpack/prod.js).

Note! Configuration is not 'shared' between files. When updating, please adjust/update the properties in both files where needed.

BTW: I have chosen simpler approach with some code duplication instead of more complex setup without code duplication.

Git branches

Master will have same content as base setup.

  • master: same as base.
  • dev: development branch

Testing

For testing this project uses Jest and Enzyme. Basic Jest definitions are taken from create-react-app scripts. The mockup scripts are in jest folder and the jest configuration is in package.json.