/**
 * Utility functions for playing audio in Node.js
 */
/**
 * Check if Node.js audio playback is available
 * @returns True if Node.js audio playback is available
 */
export declare function isNodeAudioAvailable(): Promise<boolean>;
/**
 * Play audio in Node.js
 * @param audioBytes Audio data as Uint8Array
 * @param sampleRate Sample rate in Hz (default: 24000 for WitAI, 16000 for others)
 * @param engineName Name of the TTS engine (used to determine if raw PCM conversion is needed)
 * @returns Promise that resolves when audio playback is complete
 */
export declare function playAudioInNode(audioBytes: Uint8Array, sampleRate?: number, engineName?: string): Promise<void>;
/**
 * Pause audio playback by stopping the current process
 * @returns True if playback was paused, false otherwise
 */
export declare function pauseAudioPlayback(): boolean;
/**
 * Resume audio playback is not supported in this implementation
 * @returns Always false as resume is not supported
 */
export declare function resumeAudioPlayback(): boolean;
/**
 * Stop audio playback
 * @returns True if playback was stopped, false otherwise
 */
export declare function stopAudioPlayback(): boolean;