export declare class ArrayHelper {
    static chunks<T>(array: Array<T> | null, n: number | null): Array<Array<T>> | null;
    static distinct<T>(array: Array<T> | null, fn: (x: T) => any): Array<T> | null;
    static fromCsv(content: string | null): Array<any> | null;
    static group<T>(array: Array<T>, fn: (x: T) => any): Array<Array<T>>;
    static repeat<T>(item: T, n: number): Array<T>;
}