import { IGroupResult } from './IGroupResult';
export declare class List<T> {
    private _items;
    constructor(items?: Array<T>);
    any(predicate?: (item: T) => boolean): boolean;
    distinct(): List<T>;
    group(predicate: (item: T) => any): Array<IGroupResult<T>>;
    sum(predicate: (item: T) => number): number;
    avg(predicate: (item: T) => number): number;
    min(predicate: (item: T) => number): number;
    max(predicate: (item: T) => number): number;
    add(item: T): List<T>;
    addRange(items: Array<T>): List<T>;
    insert(index: number, item: T): List<T>;
    first(): T;
    last(): T;
    take(count: number): List<T>;
    offset(startIndex: number, count: number): List<T>;
    remove(predicate?: (item: T) => boolean): List<T>;
    removeAt(index: number): List<T>;
    where(predicate?: (item: T) => boolean): List<T>;
    forEach(action: (item: T) => void): List<T>;
    orderBy(selector: (item: T) => any): List<T>;
    orderByDescending(selector: (item: T) => any): List<T>;
    toArray(): Array<T>;
    contains(predicate?: (item: T) => boolean): boolean;
    count(predicate?: (item: T) => boolean): number;
    firstOrDefault(predicate?: (item: T) => boolean): T;
    singleOrDefault(predicate?: (item: T) => boolean): T;
    copy(): List<T>;
    clear(): void;
}