What is webpack and how it works?

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If you are a front-end developer, I’m pretty sure that you have heard of Webpack or you saw it in a project. You may know something about it, for example how it works, or you may even have no clue at all. Either way, I hope that after reading this article you will probably feel comfortable enough to understand Webpack.





Webpack is a popular module bundler that can also act as a module loader. It can load modules on demand as they are needed by the application, in addition to bundling modules. This technique employs a dependency graph to determine the loading and execution order of modules.




Tobias Koppers – Webpack’s father

Webpack was first released in 2012 by Tobias Koppers, a software developer from Germany. At that time, developers were shifting towards building more complex and modular applications using JavaScript, but there was no effective way to manage the various files and dependencies required for these applications.

Koppers created its as a solution to this problem, with the goal of making it easy to manage complex dependencies and build large, modular web applications. The initial version of Webpack was relatively simple and focused mainly on bundling JavaScript files, but it quickly gained popularity among web developers and evolved to support a wide range of file types and use cases.




    • When you have multiple JavaScript files that need to be combined into a single file for deployment to a production environment. Webpack can bundle all of these files together and optimize the resulting code for performance and size.
    • When you want to use modern JavaScript features that are not supported by all browsers. Webpack can use Babel to transpile your code so that it will work in older browsers that don’t support the latest JavaScript syntax.
    • When you want to use other file types like CSS, images, or fonts in your application. Webpack has loaders for all of these file types, which means that you can easily include them in your JavaScript code and have them automatically processed and optimized by Webpack.
    • When you want to use third-party libraries or frameworks in your application. Webpack can help you manage the dependencies for these libraries and make sure that they are included in the final bundle in the correct order.
    • When you want to optimize your application’s performance by reducing the size of the code that needs to be downloaded by the browser. It can use various techniques like tree shaking, code splitting, and minification to make your code smaller and more efficient.





    • Webpack starts by looking for the entry point of your application. This is usually a single JavaScript file that serves as the starting point for the rest of the code.
    • Once it has found the entry point, Webpack uses a process called “dependency resolution” to determine all of the modules and files that are required to run the application. It creates a “dependency graph” that shows the relationships between all of these modules.
    • Webpack then uses “loaders” to process each of these modules and files. Loaders are plugins that can transform files from one format to another, like ES6 JavaScript to ES5, or compiling Sass into CSS.
    • After processing the modules, Webpack bundles them into a JavaScript file or multiple files if code splitting is configured.
    • Webpack optimizes the code by applying techniques like minification, dead code elimination, and tree shaking before outputting the bundled code.
    • Finally, It generates bundled code and assets like images, fonts, and stylesheets for serving to the browser.

You can get more detail with the example configuration below.



Here is a simple example of a basic configuration file for Webpack:


webpack tutorial

In this example, we are telling Webpack to use ./src/index.js as the entry point for the application, and to output the bundled JavaScript file to ./dist/main.js.

To use this configuration, create a file named webpack.config.js in the root directory of your project and copy the code above into it. Then, install Webpack and the necessary plugins and loaders using npm or yarn:


webpack tutorial

Once you have installed its, you can run it from the command line using:


webpack tutorial

This will run Webpack with the default configuration file (webpack.config.js) in the current directory.



In general, It is a powerful tool for managing and optimizing code in complex web applications. It use multiple JavaScript files, third-party libraries, and work across different browsers and devices.

In the years since its initial release, Webpack has undergone numerous updates and improvements. It has become one of the most popular tools in the web development community. Today, developers around the world use it to build and bundle complex web applications, making it an essential part of the modern web development toolkit.

You can read more on the official documentation: https://webpack.js.org/

I hope you are excited enough to explore more options and ways of doing things with its. That’s all for now, hope to be back soon with another awesome topic.

Check more useful articles to read here: https://topsquad.dev/blog/

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