import { TTS } from '../../agents/providers.js';
import type { OpenAITTSModel } from './models.js';
/** Options for {@link OpenAITTS}. */
export type OpenAITTSOptions = {
    /** OpenAI API key. Defaults to the `OPENAI_API_KEY` environment variable. */
    apiKey?: string | null;
    /** Voice id. Default `'ash'`. */
    voice?: string;
    /** TTS model id. Default `'gpt-4o-mini-tts'`. */
    model?: OpenAITTSModel | string;
    /** Output audio sample rate in Hz. Default `24000`. */
    sampleRate?: number;
    /** Playback speed multiplier. Default `null` (provider default, 1.0). */
    speed?: number | null;
    /** Stream audio as it is synthesized. Default `true`. */
    stream?: boolean;
};
declare class OpenAITTSImpl extends TTS {
    static readonly displayName = "OpenAITTS";
    _providerName: string;
    apiKey: string | null;
    voiceId: string;
    voice: string;
    model: string;
    speed: number | null;
    ttsStream: boolean;
    constructor(opts?: OpenAITTSOptions);
    getRuntimeConfig(): Record<string, any>;
}
export type OpenAITTS = OpenAITTSImpl;
/** OpenAI text-to-speech (TTS) synthesizer. */
export declare const OpenAITTS: (opts?: OpenAITTSOptions) => OpenAITTS;
export {};