export interface IOpenAiTtsOptions {
    apiKey: string;
    text: string;
    voice?: 'alloy' | 'echo' | 'fable' | 'onyx' | 'nova' | 'shimmer';
    model?: 'tts-1' | 'tts-1-hd';
    responseFormat?: 'mp3' | 'opus' | 'aac' | 'flac';
    speed?: number;
}
export declare function textToSpeech(options: IOpenAiTtsOptions): Promise<NodeJS.ReadableStream>;