import { TTS } from '../../agents/providers.js';
/**
 * Configuration options for the Neuphonic text-to-speech (TTS) provider.
 */
export type NeuphonicTTSOptions = {
    /**
     * Neuphonic API key used to authenticate requests.
     * Defaults to the `NEUPHONIC_API_KEY` environment variable when omitted.
     */
    apiKey?: string;
    /**
     * Identifier of the Neuphonic voice to synthesize with.
     * Defaults to `null`, in which case the provider's default voice is used.
     */
    voiceId?: string | null;
    /**
     * BCP-47 language code for synthesis (e.g. `"en"`).
     * No default is applied; when omitted the provider's default language is used.
     */
    langCode?: string;
    /**
     * Audio output sampling rate in Hz. Defaults to `22050`.
     */
    samplingRate?: number;
};
declare class NeuphonicTTSImpl extends TTS {
    _providerName: string;
    apiKey?: string;
    voiceId: string | null;
    voice: string | null;
    constructor(opts?: NeuphonicTTSOptions);
    getRuntimeConfig(): Record<string, any>;
}
/** Instance type of a configured Neuphonic TTS provider. */
export type NeuphonicTTS = NeuphonicTTSImpl;
/**
 * Neuphonic text-to-speech (TTS) provider.
 *
 * @param opts - Provider configuration (API key, voice, language, sampling rate).
 * @returns A configured Neuphonic TTS provider instance.
 */
export declare const NeuphonicTTS: (opts?: NeuphonicTTSOptions) => NeuphonicTTS;
export {};