About deps

Test2.js

function TableContainer({ columns=[] }) {
    const [sizes, setSizes] = useState(getSizes(columns));
    
    const onAdd = useCallback((newcolumn) => {
      columns.push(newColumn);
    }, [columns]);
    
    useEffect(() => {
      setSizes(getSizes(columns));
    }, [columns]);

    return (
    	<TableUI
          columns={columns}
          sizes={sizes}
          onAdd={onAdd}
        />
    );
}