import { BigNumber } from '@ethersproject/bignumber';
/** Returns the default transaction TTL for the chain, in minutes. */
export declare function getDefaultTransactionTtl({ chainId }: {
    chainId: number;
}): number;
export default function getTransactionDeadline({ chainId, blockTimestamp, }: {
    chainId: number;
    blockTimestamp: BigNumber;
}): BigNumber | undefined;