import { TTS } from '../../agents/providers.js';
/** Options for {@link SpeechifyTTS}. */
export type SpeechifyTTSOptions = {
    /** Speechify API key. Defaults to the `SPEECHIFY_API_KEY` environment variable. */
    apiKey?: string;
    /** Voice id. Default `'kristy'`. */
    voiceId?: string;
    /** TTS model id. Default `'simba-english'`. */
    model?: string;
    /** Output audio sample rate in Hz. Default `24000`. */
    sampleRate?: number;
};
declare class SpeechifyTTSImpl extends TTS {
    static readonly displayName = "SpeechifyTTS";
    _providerName: string;
    apiKey?: string;
    voiceId: string;
    voice: string;
    model: string;
    constructor(opts?: SpeechifyTTSOptions);
    getRuntimeConfig(): Record<string, any>;
}
export type SpeechifyTTS = SpeechifyTTSImpl;
/** Speechify text-to-speech (TTS) synthesizer. */
export declare const SpeechifyTTS: (opts?: SpeechifyTTSOptions) => SpeechifyTTS;
export {};