Rollup.js

By default Rollup is very minimal compare to Parcel.
But it can be very powerful by using plugins.

Notes

When importing a js, css, etc... don't forget to put leading "./" or it won't do anything.

"build": "rollup -c",
"dev": "rollup -c -w" // watch files and rebuild

SCSS, SASS
Compile SCSS/SASS using node-sass by default.
URL
Can be used to include assets in js. link
BrowserSync
Serves and auto reloads browser. (default port: 3001)
However can be replaced with VS Code Live Reload extension.
Terser
Minifies generated es bundle.