1 files changed, 9 insertions, 10 deletions
diff --git a/packages/testnet-faucets/src/ts/handler.ts b/packages/testnet-faucets/src/ts/handler.ts
index 6d26691d6..3749bc70b 100644
--- a/packages/testnet-faucets/src/ts/handler.ts
+++ b/packages/testnet-faucets/src/ts/handler.ts
@@ -5,9 +5,12 @@ import { Provider } from 'ethereum-types';
 import * as express from 'express';
 import * as _ from 'lodash';
 
-import { NonceTrackerSubprovider, PrivateKeyWalletSubprovider } from '@0xproject/subproviders';
-import ProviderEngine = require('web3-provider-engine');
-import RpcSubprovider = require('web3-provider-engine/subproviders/rpc');
+import {
+    NonceTrackerSubprovider,
+    PrivateKeyWalletSubprovider,
+    RPCSubprovider,
+    Web3ProviderEngine,
+} from '@0xproject/subproviders';
 
 import { configs } from './configs';
 import { constants } from './constants';
@@ -34,19 +37,15 @@ enum RequestedAssetType {
 const FIVE_DAYS_IN_MS = 4.32e8; // TODO: make this configurable
 
 export class Handler {
-    private _networkConfigByNetworkId: ItemByNetworkId<NetworkConfig> = {};
+    private readonly _networkConfigByNetworkId: ItemByNetworkId<NetworkConfig> = {};
     private static _createProviderEngine(rpcUrl: string): Provider {
         if (_.isUndefined(configs.DISPENSER_PRIVATE_KEY)) {
             throw new Error('Dispenser Private key not found');
         }
-        const engine = new ProviderEngine();
+        const engine = new Web3ProviderEngine();
         engine.addProvider(new NonceTrackerSubprovider());
         engine.addProvider(new PrivateKeyWalletSubprovider(configs.DISPENSER_PRIVATE_KEY));
-        engine.addProvider(
-            new RpcSubprovider({
-                rpcUrl,
-            }),
-        );
+        engine.addProvider(new RPCSubprovider(rpcUrl));
         engine.start();
         return engine;
     }