export declare class Queue<T = unknown> {
    active: boolean;
    list: Array<T>;
    onIteration?: (item: T) => Promise<unknown> | void;
    constructor(props?: {
        onIteration?: (item: T) => Promise<unknown> | void;
    });
    push: (item: T) => void;
    process: () => Promise<void>;
    start: () => Promise<void>;
    stop: () => void;
}