export declare class Iter<T> implements Iterable<T> {
    protected readonly iterable: Iterable<T>;
    static of<T>(iterable: Iterable<T>): Iter<T>;
    constructor(iterable: Iterable<T>);
    [Symbol.iterator](): IterableIterator<T>;
    filter(predicate: (item: T) => boolean): Iter<T>;
    map<U>(mapper: (item: T) => U): Iter<U>;
    reduce<U>(reducer: (acc: U, item: T) => U, initialValue: U): U;
    forEach(callback: (item: T) => void): void;
    some(predicate: (item: T) => boolean): boolean;
}