import IList from './IList';
export declare class FastList<T = never> implements IList<T> {
    private _head;
    private _tail;
    private _length;
    get length(): number;
    push(...data: T[]): void;
    merge(data: FastList<T>): void;
    shift(): T | null;
    bisect(): void;
    head(): T | null;
    tail(): T | null;
    clear(): void;
    toString(): string;
}