import { TTS } from '../../agents/providers.js';
/**
 * Configuration options for the Hume AI text-to-speech (TTS) provider.
 */
export type HumeAITTSOptions = {
    /**
     * Hume AI API key. Falls back to the `HUMEAI_API_KEY` environment variable
     * when omitted.
     */
    apiKey?: string;
    /**
     * Voice to synthesize with. Accepts a Hume AI voice name or voice ID.
     * @default 'Serene Assistant'
     */
    voice?: string;
    /**
     * Speaking rate multiplier, where `1.0` is normal speed. Lower values slow
     * speech down, higher values speed it up.
     * @default 1.0
     */
    speed?: number;
    /**
     * Output audio sample rate in hertz.
     * @default 24000
     */
    sampleRate?: number;
};
declare class HumeAITTSImpl extends TTS {
    _providerName: string;
    apiKey?: string;
    voiceId: string;
    voice: string;
    speed: number;
    constructor(opts?: HumeAITTSOptions);
    getRuntimeConfig(): Record<string, any>;
}
/** Instance type returned by the {@link HumeAITTS} factory. */
export type HumeAITTS = HumeAITTSImpl;
/**
 * Hume AI text-to-speech (TTS) provider.
 *
 * @param opts - Voice, speed, sample rate, and credentials. See {@link HumeAITTSOptions}.
 * @returns A configured Hume AI TTS instance.
 */
export declare const HumeAITTS: (opts?: HumeAITTSOptions) => HumeAITTS;
export {};