diff --git a/src/connector/web3-provider.connector.ts b/src/connector/web3-provider.connector.ts
index d174664..6f4b314 100644
--- a/src/connector/web3-provider.connector.ts
+++ b/src/connector/web3-provider.connector.ts
@@ -2,14 +2,14 @@ import {ProviderConnector, SolStructType} from './provider.connector';
 import {AbiItem} from '../model/abi.model';
 import {Interface, defaultAbiCoder, ParamType} from 'ethers/lib/utils';
 
-type Web3 = {
+export interface IWeb3 {
     eth: {
         call(callInfo: { data: string, to: string }, blockNumber: number | string): Promise<string>
     }
 }
 
 export class Web3ProviderConnector implements ProviderConnector {
-    constructor(protected readonly web3Provider: Web3) {
+    constructor(protected readonly web3Provider: IWeb3) {
     }
 
     contractEncodeABI(