Fix linter issues

packages/web3-wrapper/src/marshaller.ts

@@ -1,4 +1,4 @@
-import { addressUtils, BigNumber } from '@0xproject/utils';
+import { addressUtils } from '@0xproject/utils';
 import {
     BlockParam,
     BlockParamLiteral,
@@ -17,7 +17,6 @@ import * as _ from 'lodash';
 import { utils } from './utils';
 
 import {
-    AbstractBlockRPC,
     BlockWithoutTransactionDataRPC,
     BlockWithTransactionDataRPC,
     CallDataRPC,

packages/web3-wrapper/src/utils.ts

@@ -3,7 +3,7 @@ import * as _ from 'lodash';
 
 export const utils = {
     isBigNumber(value: any): boolean {
-        const isBigNumber = _.isObject(value) && (value as any).isBigNumber;
+        const isBigNumber = _.isObject(value) && value.isBigNumber;
         return isBigNumber;
     },
     convertHexToNumber(value: string): number {
@@ -41,7 +41,7 @@ export const utils = {
     },
     numberToHex(value: number): string {
         if (!isFinite(value) && !this.isHexStrict(value)) {
-            throw new Error('Given input "' + value + '" is not a number.');
+            throw new Error(`Given input ${value} is not a number.`);
         }
 
         const valueBigNumber = new BigNumber(value);

packages/web3-wrapper/src/web3_wrapper.ts

@@ -6,7 +6,6 @@ import {
     BlockWithoutTransactionData,
     BlockWithTransactionData,
     CallData,
-    ContractAbi,
     FilterObject,
     JSONRPCRequestPayload,
     JSONRPCResponsePayload,
@@ -22,12 +21,7 @@ import {
 import * as _ from 'lodash';
 
 import { marshaller } from './marshaller';
-import {
-    BlockWithoutTransactionDataRPC,
-    BlockWithTransactionDataRPC,
-    TransactionRPC,
-    Web3WrapperErrors,
-} from './types';
+import { BlockWithoutTransactionDataRPC, BlockWithTransactionDataRPC, Web3WrapperErrors } from './types';
 import { utils } from './utils';
 
 const BASE_TEN = 10;