import {
  Provider,
  JSONRPCRequestPayload,
  JSONRPCResponsePayload,
} from 'ethereum-protocol';
interface Web3ProviderEngineOptions {
  pollingInterval?: number | undefined;
  blockTracker?: any;
  blockTrackerProvider?: any;
}
declare class Web3ProviderEngine implements Provider {
  constructor(options?: Web3ProviderEngineOptions);
  on(event: string, handler: (...args: any[]) => void): void;
  send(payload: JSONRPCRequestPayload): void;
  sendAsync(
    payload: JSONRPCRequestPayload,
    callback: (error: null | Error, response: JSONRPCResponsePayload) => void
  ): void;
  addProvider(provider: any): void;
  // start block polling
  start(callback?: () => void): void;
  // stop block polling
  stop(): void;
  emit(eventName: string, ...args): void;
}
export = Web3ProviderEngine;

// declare module "web3-provider-engine/subproviders/nonce-tracker";
// declare module "web3-provider-engine/subproviders/hooked-wallet";
// declare module "web3-provider-engine/subproviders/filters";