Interface Cycle<T>

interface Cycle<T> {
    new Cycle(...args: T[]): Cycle<T>;
    append(item: T): void;
    forEach(fn: (item: T, index: number) => any): void;
    front(): void | T;
    get(): T[];
    index(): number;
    length(): number;
    map(fn: (item: T, index: number) => any): any[];
    remove(i: number): void;
    rotate(): void | T;
    set(item: T): void;
}