import { AbstractTTSClient } from "../core/abstract-tts.js";
import type { SpeakOptions, TTSCredentials, UnifiedVoice } from "../types.js";
/**
 * UpliftAI TTS Client Credentials
 */
export interface UpliftAITTSCredentials extends TTSCredentials {
    /** UpliftAI API key */
    apiKey?: string;
}
/**
 * Extended options for UpliftAI TTS
 */
export interface UpliftAITTSOptions extends SpeakOptions {
    /** Output format supported by UpliftAI */
    outputFormat?: string;
    /** Callback for end of speech */
    onEnd?: () => void;
}
/**
 * UpliftAI TTS Client
 */
export declare class UpliftAITTSClient extends AbstractTTSClient {
    private apiKey;
    private baseUrl;
    private outputFormat;
    protected sampleRate: number;
    /**
     * Create a new UpliftAI TTS client
     * @param credentials Credentials including API key
     */
    constructor(credentials?: UpliftAITTSCredentials);
    /**
     * Check if credentials are valid
     */
    checkCredentials(): Promise<boolean>;
    /**
     * Get required credential field names
     */
    protected getRequiredCredentials(): string[];
    /**
     * Get available voices (static list)
     */
    protected _getVoices(): Promise<UnifiedVoice[]>;
    /**
     * Synthesize text to audio bytes
     */
    synthToBytes(text: string, options?: UpliftAITTSOptions): Promise<Uint8Array>;
    /**
     * Synthesize text to a byte stream
     */
    synthToBytestream(text: string, options?: UpliftAITTSOptions): Promise<{
        audioStream: ReadableStream<Uint8Array>;
        wordBoundaries: Array<{
            text: string;
            offset: number;
            duration: number;
        }>;
    }>;
}
export default UpliftAITTSClient;