Fail to compile

[nybbs2003]

Failed to compile
./src/components/App.tsx 22:30
Module parse failed: Unexpected token (22:30)
You may need an appropriate loader to handle this file type.
|   var connectors = useRef(null);
|   var focusConnectors = useCallback(function () {
>     return connectors.current?.focus();
|   }, []); // The provider to pass to the SwapWidget.
|   // This is a Web3Provider (from @ethersproject) supplied by @web3-react; see ./connectors.ts.
This error occurred during the build time and cannot be dismissed.

[pythonpete32]

i cant reproduce this, can you show the steps you took