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.

AsyncResolutionEvent

type AsyncResolutionEvent =
  | LinesUpdatedEvent
  | AsyncErrorEvent;

Defined in: packages/engine/src/engine/AsyncResolutionBatcher.ts:33

Something an async resolution produced: updated lines, or a failure.