import {ContractTransaction, ContractReceipt} from '@ethersproject/contracts';
declare type Callback<T> = (tx: T) => void;
export declare class Notifier<T> {
  readonly promise: Promise<T>;
  protected successCallbacks: Callback<T>[];
  protected errorCallbacks: Callback<Error>[];
  constructor(promise: Promise<T>);
  private _handlePromise;
  on<Error>(event: 'error', callback: Callback<Error>): void;
  on<T>(event: string, callback: Callback<T>): void;
}
export declare class ConfirmationNotifier extends Notifier<
  ContractTransaction | ContractReceipt
> {
  on(event: 'error' | 'confirmation', callback: any): void;
}
export {};