This site describes solve-engine as it is on main: 2.43.0, which npm does not have yet. npm installs 2.40.0, so a page may show an answer that version does not give yet.
DEFAULT_TOKEN_CLASS_PREFIX
const DEFAULT_TOKEN_CLASS_PREFIX: "solve-" = "solve-";Defined in: packages/engine/src/language/tokenClassName.ts:11
Namespace applied to a semantic category when no other one is asked for.
A prefix is needed because a bare category name like number or error
would collide with almost any host stylesheet. solve- is the narrowest
namespace that still says where the class came from, and it deliberately
names this library rather than any particular editor.