export declare class ElevenLabsError extends Error {
    code?: string | undefined;
    statusCode?: number | undefined;
    constructor(message: string, code?: string | undefined, statusCode?: number | undefined);
}
export declare function handleElevenLabsError(error: any): Error;
export declare function validateFilePath(filePath: string): void;
export declare function validateFileSize(size: number): void;
export declare function retryOperation<T>(operation: () => Promise<T>, maxRetries?: number, delayMs?: number): Promise<T>;
export declare function validateFile(filePath: string, size?: number): void;
export declare function estimateCost(durationSeconds: number, pricePerHour?: number): number;
export declare function formatErrorForLogging(error: any): string;
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