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.

WorkerRequestArgs

type WorkerRequestArgs =
  | [string, UnifiedParsingOptions]
  | [string[]]
  | [string]
  | [string, WorkerWhatIfOverrides]
  | [string, number, {
  maxDepth?: number;
  maxLines?: number;
}]
  | [{
  timeoutMs?: number;
}]
  | [string, number]
  | [string, DocumentPosition]
  | [string, DocumentPosition, string]
  | [string, LineShift];

Defined in: packages/engine/src/worker/protocol.ts:84

The positional arguments for each method, kept as a union so a request is type-checked against the method it names. An AbortSignal is never in here: it stays main-side and drives a CancelMessage instead.