Creating Page-Specific CSS/JS
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If you're creating a single page app (SPA), then you probably only need to define
one entry in webpack.config.js. But if you have multiple pages, you might
want page-specific CSS and JavaScript.
To learn how to set this up, see the Encore: Setting up your Project example.
Multiple Entries Per Page?
Typically, you should include only one JavaScript entry per page. Think of the
checkout page as its own "app", where checkout.js includes all the functionality
you need.
However, it's pretty common to need to include some global JavaScript and CSS on
every page. For that reason, it usually makes sense to have one entry (e.g. app)
that contains this global code (both JavaScript & CSS) and is included on every
page (i.e. it's included in the layout of your app). This means that you will
always have one, global entry on every page (e.g. app) and you may have one
page-specific JavaScript and CSS file from a page-specific entry (e.g. checkout).
Tip
Be sure to use split chunks to avoid duplicate and shared code between your entry files.