import { ArrayOr } from './helpers/toArray';
export type EventAction = string | symbol;
export type EventListener<T> = (value: T, action: EventAction) => void;
export declare class EventEmitter<T = any> {
    private listenersMap;
    private addListener;
    private removeListener;
    private emitMap;
    emit(action: EventAction, value: T): void;
    on(actions: ArrayOr<EventAction>, listener: EventListener<T>): void;
    once(actions: ArrayOr<EventAction>, listener: EventListener<T>): void;
    off(actions: ArrayOr<EventAction>, listener: EventListener<T>): void;
}