Using a watch command

- [Instructor] Running the build command…makes our developer experience much better…but let's take this one step farther.…At this point,…if I make any changes to my JavaScript file,…let's say we add react,…I'd have to have rebuild my files using…the build command again in order to generate…the new bundle.…As an alternative to this,…I could run webpack with a watch…and this will open up a listener…for any changes that I make to my JavaScript files.…When a change is made,…it'll go ahead and rebuild.…

So let's add a watch command…to our package Jason file.…Great.…So here we have our build command.…Let's also add a watch command…and the watch command is just webpack…with a w flag so two hyphens and a w.…So now if I run npm run watch,…notice that the cursor stays in place.…It doesn't end the process.…

It's still watching and listening for any changes.…So let's make the screen a little bit smaller…and I'm going to make Sublime a little bit smaller too…so that I can make an edit to my index file…and so that we can read it.…