It's after building the project with [`bundt`](https://github.com/lukeed/bundt) which minifies (via terser) the varying formats and passes them thru gzip for a size calculation. This is sometimes known as "minzip" (minified + gzip) size, and is what/how people should be talking about package sizes since that's the _basic_ approach for how the bytes will be sent over the wire to browsers/clients.