export declare type ArrayChangeType = "add" | "del";
export declare class ObservableArray<T> extends Array<T> {
    private _observers;
    constructor(...items: T[]);
    static from<T>(items: T[]): ObservableArray<T>;
    static observe<T>(items: T[]): ObservableArray<T>;
    register(observer: (eventType: ArrayChangeType, items: T[]) => void): void;
    unobserve(): void;
    protected raiseEvents(eventType: ArrayChangeType, items: T[]): void;
    push(...items: T[]): number;
    pop(): T;
    shift(): T;
    unshift(...items: T[]): number;
    splice(start: number, deleteCount?: number, ...items: T[]): T[];
    length: number;
}