import { TTS } from '../../agents/providers.js';
import type { DeepgramTTSModel } from './models.js';
/**
 * Configuration options for the Deepgram text-to-speech (TTS) provider.
 *
 * All fields are optional; unspecified values fall back to the defaults
 * documented below.
 */
export type DeepgramTTSOptions = {
    /**
     * Deepgram API key. Falls back to the `DEEPGRAM_API_KEY` environment
     * variable, then `null` if neither is set.
     */
    apiKey?: string | null;
    /**
     * Deepgram Aura voice/model id (e.g. `'aura-2-andromeda-en'`).
     * @default 'aura-2-andromeda-en'
     */
    model?: DeepgramTTSModel | string;
    /**
     * Voice id to synthesize with. Defaults to the value of `model`.
     * @default model
     */
    voice?: string;
    /**
     * Language code for synthesis (e.g. `'en'`).
     * @default 'en'
     */
    language?: string;
    /**
     * Output audio sample rate in Hz.
     * @default 24000
     */
    sampleRate?: number;
    /**
     * Stream audio from the model.
     * @default true
     */
    stream?: boolean;
    /**
     * Output audio encoding.
     * @default 'linear16'
     */
    encoding?: string;
    /**
     * Deepgram Speak WebSocket endpoint.
     * @default 'wss://api.deepgram.com/v1/speak'
     */
    baseUrl?: string;
    /** Additional/forward-compatible Deepgram options; unknown keys are accepted and passed through. */
    [key: string]: any;
};
declare class DeepgramTTSImpl extends TTS {
    _providerName: string;
    apiKey: string | null;
    model: string;
    voice: string;
    language: string;
    ttsStream: boolean;
    ttsEncoding: string;
    baseUrl: string;
    constructor(opts?: DeepgramTTSOptions);
    getRuntimeConfig(): Record<string, any>;
}
/** Instance type produced by the {@link DeepgramTTS} factory. */
export type DeepgramTTS = DeepgramTTSImpl;
/**
 * Deepgram text-to-speech (TTS) provider.
 *
 * Creates a configured Deepgram TTS instance for use in a voice agent.
 *
 * @param opts - Provider options; see {@link DeepgramTTSOptions}.
 * @returns A configured Deepgram TTS provider instance.
 */
export declare const DeepgramTTS: (opts?: DeepgramTTSOptions) => DeepgramTTS;
export {};