import { SnailEventListener } from "../typings";
export declare class SnailEvent<DT = any> {
    private eventMap;
    private onceWrapperMap;
    constructor();
    on: <ErrorData = any>(eventName: string, listener: SnailEventListener<DT, ErrorData>) => void;
    off: (eventName: string, listener: SnailEventListener<DT>) => void;
    once: (eventName: string, listener: SnailEventListener<DT>) => void;
    emit: (eventName: string, ...args: any) => boolean;
}