AI solution for Interview Question on BFE.dev
79. How does HMR(Hot Module Replacement) work in Webpack?

In short, HMR allows you to make changes to your code on the fly and see those changes reflected in the browser without having to manually refresh the page.

When you make changes to a file, webpack detects the change and emits a signal to the HMR runtime. The runtime then sends a message to the browser telling it to update the changed module in the current view.

This process is faster than a full page refresh because only the updated module is replaced, rather than the entire page being reloaded. It also allows you to maintain the state of your application, which would otherwise be lost during a full page refresh.

HMR can be enabled in webpack by configuring the devServer and plugins options in your webpack.config.js file.