/**
 * Fish Audio TTS Handler
 *
 * Implementation of TTS using Fish Audio API. Lower-cost alternative to
 * ElevenLabs with strong multilingual support and 15s voice cloning.
 *
 * @module voice/providers/FishAudioTTS
 * @see https://docs.fish.audio/text-to-speech/text-to-speech
 */
import type { TTSHandler, TTSOptions, TTSResult } from "../../types/index.js";
/**
 * Fish Audio Text-to-Speech Handler.
 *
 * Auth: `Authorization: Bearer ${FISH_AUDIO_API_KEY}`.
 * Models: speech-1.5 (standard), speech-1.6, s1 (default; latest).
 */
export declare class FishAudioTTS implements TTSHandler {
    readonly maxTextLength = 5000;
    private readonly apiKey;
    private readonly baseUrl;
    constructor(apiKey?: string);
    isConfigured(): boolean;
    synthesize(text: string, options?: TTSOptions): Promise<TTSResult>;
    private mapFormat;
    private effectiveFormat;
    private getSampleRate;
}