/**
 * The default timeout for waiting for a transaction to be included in a block.
 */
export declare const DEFAULT_TIMEOUT: number;
/**
 * Keep calling a `fn` for `timeoutInSeconds` seconds, if `keepWaitingIf` is true.
 * Returns an array of all attempts to call the function.
 */
export declare function withExponentialBackoff<T>(fn: (previousFailure?: T) => Promise<T>, keepWaitingIf: (result: T) => boolean, timeoutInSeconds: number, exponentialFactor?: number, verbose?: boolean): Promise<T[]>;
/**
 * If contracts are implemented using the `#[contracterror]` macro, then the
 * errors get included in the on-chain XDR that also describes your contract's
 * methods. Each error will have a specific number. This Regular Expression
 * matches these "expected error types" that a contract may throw, and helps
 * @{link AssembledTransaction} parse these errors.
 */
export declare const contractErrorPattern: RegExp;
/**
 * A TypeScript type guard that checks if an object has a `toString` method.
 */
export declare function implementsToString(obj: unknown): obj is {
    toString(): string;
};