message: Re-use the existing interface
diff: @@ -13,8 +13,8 @@ async function renameSymbol(editor: Editor) {
  }
  }
  -function findSelectedSymbol(editor: Editor): Nothing | Identifier {
  - let result: Nothing | Identifier = new Nothing();
  +function findSelectedSymbol(editor: Editor): Symbol {
  + let result: Symbol = new Nothing();
  const { code, selection } = editor;
  const ast = t.parse(code);
  