/**
 * SequencerTimingHelper - Manages stable timing for karaoke highlighting
 *
 * Handles:
 * - High-resolution timing from spessasynth Sequencer
 * - Fallback to AudioContext time or performance.now()
 * - Time drift compensation
 * - Stable timing even during AudioContext interruptions
 */
export interface TimeSource {
    /** Get current playback time in seconds */
    getCurrentTime(): number;
    /** Check if timing source is valid/ready */
    isReady(): boolean;
}
export declare class SequencerTimingHelper {
    private sequencer;
    private audioContext;
    private fallbackStartTime;
    private fallbackElapsed;
    private isPlaying;
    private lastUpdateTime;
    private audioContextStartTime;
    constructor();
    /**
     * Set the spessasynth Sequencer instance
     */
    setSequencer(sequencer: any): void;
    /**
     * Set the AudioContext for fallback timing
     */
    setAudioContext(audioContext: AudioContext): void;
    /**
     * Update playback state
     */
    setPlaying(playing: boolean): void;
    /**
     * Get current playback time with best available source
     */
    getCurrentTime(): number;
    /**
     * Seek to a specific time
     */
    seek(time: number): void;
    /**
     * Reset timing to zero
     */
    reset(): void;
    /**
     * Check if high-resolution timing is available
     */
    hasHighResolutionTime(): boolean;
    /**
     * Get timing source info for debugging
     */
    getTimingSourceInfo(): string;
}