import { TTS } from '../../agents/providers.js';
/**
 * Configuration options for the NVIDIA Riva text-to-speech (TTS) provider.
 */
export type NvidiaTTSOptions = {
    /**
     * NVIDIA API key. Falls back to the `NVIDIA_API_KEY` environment variable
     * when omitted.
     */
    apiKey?: string;
    /**
     * Riva synthesis voice name.
     * @default 'English-US-Female-1'
     */
    voice?: string;
    /**
     * BCP-47 language code for synthesis (e.g. `'en-US'`). Accepted for
     * compatibility; currently has no effect.
     */
    languageCode?: string;
    /**
     * Output audio sample rate, in hertz.
     * @default 22050
     */
    sampleRate?: number;
    /**
     * Riva endpoint host. Accepted for compatibility; currently has no effect.
     */
    server?: string;
    /** Additional provider options are accepted for forward compatibility. */
    [key: string]: any;
};
declare class NvidiaTTSImpl extends TTS {
    _providerName: string;
    apiKey?: string;
    voiceId: string;
    voice: string;
    constructor(opts?: NvidiaTTSOptions);
    getRuntimeConfig(): Record<string, any>;
}
/** A configured NVIDIA Riva TTS provider instance. */
export type NvidiaTTS = NvidiaTTSImpl;
/**
 * NVIDIA Riva text-to-speech (TTS) provider.
 *
 * @param opts - {@link NvidiaTTSOptions} configuration.
 * @returns A configured TTS provider instance.
 */
export declare const NvidiaTTS: (opts?: NvidiaTTSOptions) => NvidiaTTS;
export {};