fix: remove unused API

Author: Akos Kitta

arduino-ide-extension/src/common/protocol/board-list.ts

@@ -123,13 +123,7 @@ export interface BoardListItemWithBoard extends BoardListItem {
   readonly board: BoardIdentifier;
 }
 
-export function isBoardListItemWithBoard(
-  arg: unknown
-): arg is BoardListItemWithBoard {
-  return isBoardListItem(arg) && Boolean(arg.board);
-}
-
-export function getBoardOrInferredBoard(
+function getBoardOrInferredBoard(
   item: BoardListItem
 ): BoardIdentifier | undefined {
   let board: BoardIdentifier | undefined = undefined;
@@ -199,7 +193,9 @@ function isInferenceType(arg: unknown): arg is InferenceType {
  *  1. `BoardListItem#board`:
  *     1. Items with `'arduino'` vendor ID in the `fqbn` come before other vendors.
  *     1. Natural compare of the `name`.
- *  1. If the `BoardListItem`s do not have a `board` property, `BoardListItem#port#address` natural compare is the fallback.
+ *  1. If the `BoardListItem`s do not have a `board` property:
+ *     1. Ambiguous boards come before no boards.
+ *     1. `BoardListItem#port#address` natural compare is the fallback.
  */
 function boardListItemComparator(
   left: BoardListItem,