Update your running application instantly without refreshing the entire page.
Hot Module Replacement, or HMR, lets Webpack replace changed modules while your application is running. Instead of rebuilding everything and forcing you to refresh the browser, Webpack can send the updated module to the browser and apply the change.
This makes development much faster because you can see code changes almost immediately. HMR can also preserve parts of the current application state, depending on how the application and modules are designed to handle updates.
What you'll walk away knowing