/** @packageDocumentation
 * @module Base
 */
/** Event handler.
 * @internal
 */
export declare type EventHandler = (...args: any[]) => void;
/** @internal */
export declare class EventEmitter<T extends EventHandler> implements Event<T> {
    private _handlers;
    private _removedHandlers;
    private _emitting;
    add(handler: T): void;
    remove(handler: T): void;
    emit(...args: Parameters<T>): void;
}
/** @internal */
export interface Event<T extends EventHandler> {
    add(handler: T): void;
    remove(handler: T): void;
}
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