It’s about 25k lines of rust code compiled to do the following:

- Layout/position a directed graph

- Compute a bounding box for text labels and produce font glyphs for the rendering engine

- Generate an SVG

- Optionally, sync to a Vizdom account

Fun fact, the majority of that wasm blob is what is powering the web application itself. You can see it in action using the editor view/diff on the site.