export declare const useGetAllowance: ({ tokenAddress, sender, }: {
    tokenAddress: `0x${string}`;
    sender: `0x${string}`;
}) => {
    allowance: bigint | null;
    isAllowanceLow: boolean;
    isLoading: boolean;
    isError: boolean;
    error: import('viem').ReadContractErrorType | null;
};