import { AudioManager } from './AudioManager';
/**
 * Typing sound configuration
 */
export interface TypingSoundConfig {
    /** Enable typing sounds (default: true) */
    enabled: boolean;
    /** Volume multiplier (0.0 to 1.0, default: 0.3) */
    volume: number;
    /** Typing sound URL (default: assets.vowel.to/typing-sound.pcm) */
    typingSoundUrl: string;
    /** Click sound URL (default: assets.vowel.to/mouse-click-sound.pcm) */
    clickSoundUrl?: string;
    /** Minimum segment duration in ms (default: 200) */
    minSegmentDurationMs: number;
    /** Maximum segment duration in ms (default: 800) */
    maxSegmentDurationMs: number;
    /** Minimum pause duration in ms (default: 300) */
    minPauseDurationMs: number;
    /** Maximum pause duration in ms (default: 1500) */
    maxPauseDurationMs: number;
    /** Probability of click sound vs typing (0.0 to 1.0, default: 0.15) */
    clickSoundProbability: number;
}
/**
 * Typing Sound Manager class
 * Manages client-side typing/clicking filler sounds during AI thinking
 */
export declare class TypingSoundManager {
    private config;
    private audioManager;
    private typingSoundData;
    private clickSoundData;
    private isPlaying;
    private activeTimeout;
    private isInitialized;
    private initializationPromise;
    private typingSoundDurationMs;
    private clickSoundDurationMs;
    /**
     * Constructor
     * @param config - Typing sound configuration
     * @param audioManager - Audio manager instance for playback
     */
    constructor(config: Partial<TypingSoundConfig>, audioManager: AudioManager);
    /**
     * Initialize and load sound files from CDN
     * This is called lazily on first use
     */
    initialize(): Promise<void>;
    /**
     * Internal initialization implementation
     */
    private _doInitialize;
    /**
     * Load sound file from CDN
     * @param url - CDN URL for sound file
     * @returns Promise resolving to audio data as Uint8Array
     */
    private loadSoundFromCDN;
    /**
     * Start playing typing sounds
     * Automatically initializes if not already done
     */
    start(): Promise<void>;
    /**
     * Stop playing typing sounds immediately
     */
    stop(): void;
    /**
     * Set volume (0.0 to 1.0)
     * @param volume - Volume level
     */
    setVolume(volume: number): void;
    /**
     * Play a random typing/clicking segment
     */
    private playRandomSegment;
    /**
     * Apply fade-in and fade-out to audio data to prevent clicks/pops
     * @param data - Audio data (PCM16)
     * @param fadeMs - Fade duration in milliseconds
     * @returns Processed audio data with fade applied
     */
    private applyFadeInOut;
    /**
     * Generate random number between min and max (inclusive)
     */
    private randomBetween;
    /**
     * Cleanup resources
     */
    cleanup(): void;
}
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