import type { Chain, PublicClient, Transport } from 'viem';
import { type RawOrContractAddress } from '../../../types/addresses.js';
export type GetLatestProposedL2BlockNumberParameters<TChain extends Chain | undefined = Chain | undefined, _chainId = TChain extends Chain ? TChain['id'] : number> = {
    l2OutputOracle: RawOrContractAddress<_chainId>;
};
export type GetLatestProposedL2BlockNumberReturnType = {
    l2BlockNumber: bigint;
};
/**
 * Gets the latest proposed L2 block number from the L2 Output Oracle.
 *
 * @param {RawOrContractAddress} l2OutputOracle the address of the L2 Output Oracle
 * @returns {GetLatestProposedL2BlockNumberReturnType} the latest proposed L2 block number
 */
export declare function getLatestProposedL2BlockNumber<TChain extends Chain | undefined>(client: PublicClient<Transport, TChain>, { l2OutputOracle, }: GetLatestProposedL2BlockNumberParameters<TChain>): Promise<GetLatestProposedL2BlockNumberReturnType>;
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