declare function MusicManager(this: void): MusicManager;

declare interface MusicManager {
  /**
   * @param music
   * @param fadeRate Default is 0.08.
   */
  Crossfade(music: Music | int, fadeRate?: float): void;
  Disable(): void;
  /**
   * @param layerID Default is 0.
   */
  DisableLayer(layerID?: int): void;
  Enable(): void;
  /**
   * @param layerID Default is 0.
   * @param instant Default is false.
   */
  EnableLayer(layerID?: int, instant?: boolean): void;
  /**
   * @param music
   * @param volume Default is 1.
   * @param fadeRate Default is 0.08.
   */
  Fadein(music: Music | int, volume?: float, fadeRate?: float): void;
  /**
   * @param fadeRate Default is 0.08.
   */
  Fadeout(fadeRate?: float): void;
  GetCurrentMusicID(): Music | int;
  GetQueuedMusicID(): Music | int;
  IsEnabled(): boolean;
  /**
   * @param layerID Default is 0.
   */
  IsLayerEnabled(layerID?: int): boolean;
  Pause(): void;
  PitchSlide(targetPitch: float): void;
  Play(music: Music | int, volume: float): void;
  Queue(music: Music | int): void;
  ResetPitch(): void;
  Resume(): void;
  UpdateVolume(): void;
  /**
   * @param targetVolume
   * @param fadeRate Default is 0.08.
   */
  VolumeSlide(targetVolume: float, fadeRate?: float): void;
}