TensorFlowJS tutorial: Installing and using Parcel

Parcel is used for bundling JavaScript files, CSS files, and many other types of files. Instead of using a tag in html for your JavaScript page, you would use an import directly in your JavaScript script like
import * as tf from "@tensorflow/tfjs";
I think Parcel makes a bundle.js file for you to include on any page with your script tag once in your page html then adds all your imported scripts to that file before your code runs for you.
You may have to be using NodeJS to use and configure Parcel yourself, I'm not sure.