PROOF OF CONCEPT render mermaid diagrams to svg in node.js without a browser
run node test.js
maybe it works, sort of
requires rsvg-convert (you'll have to find it yourself idk. it's librsvg2-bin on apt)
(yes it needs an svg renderer to generate the svg, because it has to, e.g. determine how much space is used up by textboxes etc.)
aaa