export interface AudioElementLike {
    src: string;
    loop: boolean;
    volume: number;
    currentTime: number;
    paused: boolean;
    ended: boolean;
    play(): Promise<void>;
    pause(): void;
    load(): void;
}
export type AudioElementFactory = () => AudioElementLike;
export type MusicSourceResolver = (path: string) => Promise<string>;
export interface MusicSystemOptions {
    createElement: AudioElementFactory;
    resolveSource?: MusicSourceResolver;
    volume?: number;
    crossfadeDuration?: number;
}
export interface MusicState {
    readonly track?: string;
    readonly paused: boolean;
    readonly playing: boolean;
    readonly volume: number;
}
export declare class MusicSystem {
    private readonly createElement;
    private readonly resolveSource;
    private readonly crossfadeDuration;
    private currentElement?;
    private fadingElement?;
    private track?;
    private volume;
    private fadeInterval?;
    constructor(options: MusicSystemOptions);
    playTrack(trackNum: number): Promise<void>;
    play(track: string, { loop, restart }?: {
        loop?: boolean;
        restart?: boolean;
    }): Promise<void>;
    pause(): void;
    resume(): Promise<void>;
    stop(): void;
    setVolume(volume: number): void;
    getState(): MusicState;
    private startCrossfade;
    private cancelFade;
}
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