import { EvmWalletProvider } from "./wallet-providers";
/**
 * Approves a spender to spend tokens on behalf of the owner
 *
 * @param wallet - The wallet provider
 * @param tokenAddress - The address of the token contract
 * @param spenderAddress - The address of the spender
 * @param amount - The amount to approve in atomic units (wei)
 * @returns A success message or error message
 */
export declare function approve(wallet: EvmWalletProvider, tokenAddress: string, spenderAddress: string, amount: bigint): Promise<string>;
/**
 * Scales a gas estimate by a given multiplier.
 *
 * This function converts the gas estimate to a number, applies the multiplier,
 * rounds the result to the nearest integer, and returns it as a bigint.
 *
 * @param gas - The original gas estimate (bigint).
 * @param multiplier - The factor by which to scale the estimate.
 * @returns The adjusted gas estimate as a bigint.
 */
export declare function applyGasMultiplier(gas: bigint, multiplier: number): bigint;
/**
 * Retry function with exponential backoff
 *
 * @param fn - The function to retry
 * @param maxRetries - Maximum number of retries (default: 3)
 * @param baseDelay - Base delay in milliseconds for retries (default: 1000)
 * @param initialDelay - Initial delay before the first attempt in milliseconds (default: 0)
 * @returns Promise that resolves with the function result or rejects with the last error
 */
export declare function retryWithExponentialBackoff<T>(fn: () => Promise<T>, maxRetries?: number, baseDelay?: number, initialDelay?: number): Promise<T>;