import { IQueue } from '@testring-dev/types';
export declare class Queue<T> implements IQueue<T> {
    private array;
    constructor(initialArray?: Array<T>);
    push(...elements: Array<T>): void;
    shift(): T | void;
    clean(): void;
    /**
     *
     * @param {(item: T, index: number) => boolean} fn - function to filter elements for removal
     * @returns - number of elements removed
     */
    remove(fn: (item: T, index: number) => boolean): number;
    /**
     * extract - filter items, return filtered, leave the rest
     *
     * @param {(item: T, index: number) => boolean} fn - function to filter elements for removal
     * @returns - number of elements removed
     */
    extract(fn: (item: T, index: number) => boolean): T[];
    getFirstElement(offset?: number): T | null;
    get length(): number;
    [Symbol.iterator](): ArrayIterator<T>;
}
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