/**
 * @file ERC Standards Utilities
 * @version 1.0.0
 * @lastModified 2024-06-07
 *
 * Utility functions for ERC token standards
 */
import { ethers } from 'ethers';
import { NFTMetadata } from './types.js';
/**
 * Interface check result with contract type
 */
interface ContractTypeResult {
    isERC20: boolean;
    isERC721: boolean;
    isERC1155: boolean;
}
/**
 * Check if an address is a valid contract and determine its type
 *
 * @param address Contract address to check
 * @param provider Ethers provider
 * @returns ContractTypeResult with flags for contract types
 */
export declare function checkContractType(address: string, provider: ethers.Provider): Promise<ContractTypeResult>;
/**
 * Fetches and parses metadata from a token URI
 *
 * @param uri The URI to fetch metadata from
 * @param tokenAddress The token contract address
 * @param tokenId The token ID
 * @returns Parsed NFT metadata
 */
export declare function fetchMetadata(uri: string, tokenAddress: string, tokenId: string | number): Promise<NFTMetadata>;
/**
 * Creates a cache key for token data
 *
 * @param keyPrefix Cache key prefix
 * @param tokenAddress Token contract address
 * @param additionalParts Additional parts to include in the key
 * @returns Cache key string
 */
export declare function createTokenCacheKey(keyPrefix: string, tokenAddress: string, ...additionalParts: (string | number | undefined)[]): string;
export {};