Using the commons chunk bundle

- [Instructor] In the previous video, we looked at how…multiple entry points can allow for smaller bundle sizes.…To take these optimizations one step further,…we can use a Webpack plugin called the Commons Chunk plugin.…This is the first time we've talked about a plugin.…A loader, as we see in all of these rules here,…performs some sort of transformation.…A plugin is a Webpack class that can do a little bit more.…The Commons Chunk plugin will look for reused code…and it will create a separate bundle that has common code.…

It will load the common code into the page first…and then load in specific page code after that.…So let's make an adjustment to our webpack.config here…and the first thing I'm going to do…is actually require Webpack.…So we're going to say const webpack = require("webpack").…Then we want to add a key for our plugins.…So right beneath module, we're going to add that.…So here on line 51, I'm going to hit the comma and then enter…and we're going to say plugins.…

Plugins is going to be an array…