import { class_Dfr } from 'atma-utils';
/** web3js compat */
export declare class PromiseEvent<TResult> extends class_Dfr<TResult> {
    private _events;
    on(event: string, fn: any): this;
    once(event: string, fn: Function): this;
    emit(event: string, ...args: any[]): this;
}