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.

WorkerMethod

type WorkerMethod =
  | "parseDocument"
  | "evaluateLines"
  | "evaluateExpression"
  | "evaluateDocument"
  | "whatIf"
  | "explainLine"
  | "traceLine"
  | "settle"
  | "getSemanticTokens"
  | "getCompletions"
  | "findReferences"
  | "getDefinition"
  | "rename"
  | "shiftLineReferences";

Defined in: packages/engine/src/worker/protocol.ts:25

The methods the harness proxies: the evaluate methods, the host calls a whole-document feature needs (goal seek through evaluateDocument, what-if, explain, trace, settle), and the language service’s editor calls.