Code Splitting en desarrollo

How to split a React application into separate components using Webpack?

The key to keeping a React project scalable is to split it into modular components. This not only improves organization, but also makes it easier to work independently on various parts of the project. We can leverage tools like Webpack to handle multiple applications efficiently. Next, I'll show you how to structure our applications using this approach.

What is necessary to get started?

Before taking the steps, it is vital to understand some basic concepts:

• Micro Frontends: This methodology allows you to create pieces of the user interface divided into smaller applications that work independently.
• Webpack: It is an essential tool for packaging JavaScript modules and helps us to manage different configurations.

How to configure a header as a separate application?

1. Create a separate application folder:
   • In our project, inside the src folder, we create a new one called header.
2. Organize the files inside the new folder:
   • In header, we add an index.js file as the entry point of the application.
   • We create a subfolder components inside header and an App.jsx file for our main component.

// index.jsimport React from 'react';import ReactDOM from 'react-dom';import App from './components/App';
ReactDOM.render(<App/>, document.getElementById('header'));

// components/App.jsximport React from 'react';
const App = () => <div>Hello React from Header</div>;
export default App;

3. Modify the HTML file to include the new div:
   • Add a new <div id="header"></div> in the public/index.html where our header application will be mounted.

How do we configure Webpack to handle multiple inputs?

1. Update input configuration:
   • In the Webpack configuration file, we define multiple entry points.

// webpack.config.jsmodule.exports = { entry: { home: './src/index.js', header: './src/header/index.js' }, output: { filename: '[name].bundle.js', path: __dirname + '/dist' } };

2. Configuration for chunking and optimization:
   • Make sure Webpack correctly chunks resources using chunkFilename.

How to verify if the configuration is correct?

To verify that everything is correctly configured, we will follow these steps:

1. Initialize the development environment:
   • Run the npm run start command in the terminal to activate the development server.
2. Inspect elements in the browser:
   • Using developer tools in the browser, verify that components render as expected. Look for elements such as Hello React from Header and make sure they are loaded from separate bundles.

This methodology not only ensures a solid project structure, but also allows different teams to work in parallel without conflicts. Keep exploring new techniques and methods to improve your workflows with React and Webpack!