export declare class PromiseQueue<T, Result> {
    private runItem;
    private queue;
    private currentItem?;
    constructor(runItem: (details: T) => {
        result: Promise<Result>;
        cancel?: () => void;
    });
    push(item: T): Promise<Result>;
    cancel(item: T, reason: unknown): void;
    runNextItem(): Promise<void>;
}