import type { TextToSpeechResponse } from "./api/types/TextToSpeechResponse.js";
export type TextToSpeechLike = Pick<TextToSpeechResponse, "audios">;
export interface PlayOptions {
    /**
     * - In Node: when true, uses `ffplay` (from ffmpeg). When false, throws (no built-in fallback).
     * - In browsers: ignored (uses HTMLAudioElement).
     */
    useFfmpeg?: boolean;
}
export interface SaveOptions {
    /**
     * If provided, saves only a single element from `audios`.
     * If omitted, concatenates all `audios` like the Python helper.
     */
    index?: number;
}
/**
 * Concatenates `TextToSpeechResponse.audios` WAV base64 chunks into a single WAV byte array
 * (matching the Python SDK helper).
 *
 * If `options.index` is provided, it decodes only that one entry (no concatenation).
 */
export declare function toWavBytes(audio: TextToSpeechLike | string[], options?: SaveOptions): Uint8Array;
export declare function save(audio: TextToSpeechLike | string[], filename: string, options?: SaveOptions): Promise<void>;
export declare function play(audio: TextToSpeechLike | string[], options?: PlayOptions): Promise<void>;