export interface Action<T = void> {
    (item: T): void;
}
export interface Func<T, TResult> {
    (item: T): TResult;
}
export declare class BabyEvent<T = Action> {
    listeners: Array<Action<T>>;
    constructor();
    addListener(listener: Action<T>): boolean;
    removeListener(listener: Action<T>): boolean;
    invoke(args: T): void;
    clone(): BabyEvent<T>;
    copy(other: BabyEvent<T>): void;
}