type Listener<T> = (data: T) => void;
export interface IEventEmitter<T = any> {
    on(event: string, listener: Listener<T>): void;
    off(event: string, listener: Listener<T>): void;
    emit(event: string, data: T): void;
    once(event: string, listener: Listener<T>): void;
    removeAllListeners(event?: string): void;
}
export declare class EventEmitter<T = any> implements IEventEmitter<T> {
    private listeners;
    on(event: string, listener: Listener<T>): void;
    off(event: string, listener: Listener<T>): void;
    emit(event: string, data?: T): void;
    once(event: string, listener: Listener<T>): void;
    removeAllListeners(event?: string): void;
}
export default EventEmitter;
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