Using the Parcel build tool with WordPress

Parcel is intended to be used to build apps from the ground up. That’s why they recommend starting with a index.js or index.html file.

You might be able to use Parcel’s packaging for a theme or plugin, but you would lose the built-in server and live reloading (“hot module replacement”) among other things. There may be more that wouldn’t work.

I don’t think Parcel is a good fit for WordPress development. Read more.