export declare class Item {
    /** original business logic */
    fn: Function;
    label: string | undefined;
    priority: number;
    /** wrapped `reject` of `fn` */
    reject: Function;
    /** wrapped `resolve` of `fn` */
    resolve: Function;
    /** number of remaining retries for rejecting Promises */
    retry: number;
    /** time when the item has been added to the queue */
    timestamp: number;
    toString(): string;
}
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