import { IEnumerable } from '../core/IEnumerable';
import { IParallelQueryable } from '../linq/IParallelQueryable';
import { IQueryable } from '../linq/IQuerable';
import { ICollection } from './ICollection';
import { IList } from './IList';
export interface IReadonlyCollection<T> extends IEnumerable<T> {
    contains(item: T): boolean;
    size: number;
    get(index: number): T;
    indexOf(item: T): number;
    lastIndexOf(item: T): number;
    join(separator?: string): string;
    toArray(): T[];
    toCollection(): ICollection<T>;
    toList(): IList<T>;
    toSet(): Set<T>;
    linq(): IQueryable<T>;
    plinq(): IParallelQueryable<T>;
    isEmpty(): boolean;
}