import type { PublicClient } from "viem";
/**
 * Finds the block number closest to a given timestamp using binary search
 * @param client - The PublicClient instance for blockchain interaction
 * @param targetTimestamp - The timestamp to find the closest block for
 * @returns Promise<number> - The block number closest to the target timestamp
 */
export declare function getBlockNumberByTimestamp(client: PublicClient, targetTimestamp: number): Promise<number>;