import { SoundToken } from "./soundToken";
import { FadeToken } from "./types";
export declare class FadeTokenImpl implements FadeToken {
    private token;
    private endVolume;
    private _finished;
    private resolveFinished;
    private cancelled;
    private finishedInternal;
    constructor(token: SoundToken, endVolume: number);
    get finished(): Promise<void>;
    cancel(): void;
    finish(): void;
    isCancelled(): boolean;
    isFinished(): boolean;
    getTargetVolume(): number;
}