I'm trying to use IFC.js to create IFC files from a web application. The documentation says the library can both read and write IFC files.

Library here: https://ifcjs.github.io/info/

I have read the documentation, searched through the source code, and can not find any clues anywhere on how to export a file with the library. Perhaps I'm just being dense and scrolled right past it.

Does anyone know how to use this library to export a file?

The context is, I have a scene in Three.js I would like to turn into an original IFC.js file. I don't require any additional information to be attached, I just need the 3D mesh data and at most materials, converted into the IFC file format.