import { Talk } from '../types/voice';
import { VoiceEngine } from './VoiceEngine';
/**
 * OpenAI-compatible TTS engine for self-hosted endpoints such as Kokoro FastAPI
 */
export declare class OpenAiCompatibleEngine implements VoiceEngine {
    private apiUrl;
    private speed;
    private model;
    /**
     * Set custom OpenAI-compatible speech endpoint
     */
    setApiEndpoint(apiUrl: string): void;
    /**
     * Set speaking speed (0.25 - 4.0)
     */
    setSpeed(speed: number): void;
    /**
     * Set model name used by the compatible endpoint
     */
    setModel(model: string): void;
    fetchAudio(input: Talk, speaker: string, apiKey?: string): Promise<ArrayBuffer>;
    getTestMessage(textVoiceText?: string): string;
}