/**
 * VoiceManager - Handles text-to-speech and speech-to-text operations
 *
 * Wraps react-native-tts and @react-native-voice/voice to provide a unified
 * interface for voice interactions with queuing and error handling.
 */
export declare class VoiceManager {
    private isSpeaking;
    private isListeningActive;
    private speechQueue;
    private currentListenResolve;
    private currentListenReject;
    private isInitialized;
    private ttsAvailable;
    private sttAvailable;
    constructor();
    /**
     * Initialize TTS and STT engines
     */
    private initialize;
    /**
     * Initialize Text-to-Speech
     */
    private initializeTTS;
    /**
     * Initialize Speech-to-Text
     */
    private initializeSTT;
    /**
     * Speak text using TTS with queuing
     *
     * @param text - Text to speak
     * @returns Promise that resolves when speech completes
     */
    speak(text: string): Promise<void>;
    /**
     * Ask a question by speaking it and then listening for response
     *
     * @param question - Question to ask
     * @returns Promise that resolves with the user's spoken response
     */
    ask(question: string): Promise<string>;
    /**
     * Start listening for speech input
     *
     * @returns Promise that resolves with recognized text
     */
    startListening(): Promise<string>;
    /**
     * Stop listening for speech input
     */
    stopListening(): Promise<void>;
    /**
     * Check if voice capabilities are available
     *
     * @returns Object indicating TTS and STT availability
     */
    isAvailable(): {
        tts: boolean;
        stt: boolean;
        both: boolean;
    };
    /**
     * Get current voice state
     */
    getState(): {
        isSpeaking: boolean;
        isListening: boolean;
    };
    /**
     * Stop all voice operations and clear queue
     */
    stopAll(): Promise<void>;
    /**
     * Set TTS language
     *
     * @param language - Language code (e.g., 'en-US', 'es-ES')
     */
    setLanguage(language: string): Promise<void>;
    /**
     * Set TTS speech rate
     *
     * @param rate - Speech rate (0.0 to 1.0, default 0.5)
     */
    setRate(rate: number): Promise<void>;
    /**
     * Set TTS pitch
     *
     * @param pitch - Voice pitch (0.5 to 2.0, default 1.0)
     */
    setPitch(pitch: number): Promise<void>;
    /**
     * Clean up resources
     */
    destroy(): Promise<void>;
    /**
     * Process next item in speech queue
     */
    private processNextInQueue;
}
/**
 * Get singleton VoiceManager instance
 */
export declare function getVoiceManager(): VoiceManager;
/**
 * Destroy singleton instance
 */
export declare function destroyVoiceManager(): Promise<void>;
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