Try enabling no-unused-variable...

packages/0x.js/src/0x.ts

@@ -19,7 +19,6 @@ import { OrderWatcher, OrderWatcherConfig } from '@0xproject/order-watcher';
 import { ECSignature, Order, Provider, SignedOrder, TransactionReceiptWithDecodedLogs } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import * as _ from 'lodash';
 
 import { constants } from './utils/constants';
 

packages/0x.js/src/types.ts

@@ -1,15 +1,3 @@
-import {
-    BlockParam,
-    BlockParamLiteral,
-    ContractAbi,
-    ContractEventArg,
-    ExchangeContractErrs,
-    FilterObject,
-    LogWithDecodedArgs,
-    Order,
-    OrderState,
-    SignedOrder,
-} from '@0xproject/types';
 
 export enum InternalZeroExError {
     NoAbiDecoder = 'NO_ABI_DECODER',

packages/0x.js/src/utils/constants.ts

@@ -1,4 +1,3 @@
-import { BigNumber } from '@0xproject/utils';
 
 export const constants = {
     NULL_ADDRESS: '0x0000000000000000000000000000000000000000',

packages/0x.js/test/0x.js_test.ts

@@ -1,14 +1,12 @@
 import { ContractWrappers } from '@0xproject/contract-wrappers';
-import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-utils';
+import { BlockchainLifecycle } from '@0xproject/dev-utils';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
 import * as _ from 'lodash';
 import 'make-promises-safe';
 import 'mocha';
-import * as path from 'path';
-import * as Sinon from 'sinon';
 
-import { ApprovalContractEventArgs, LogWithDecodedArgs, Order, TokenEvents, ZeroEx } from '../src';
+import { ApprovalContractEventArgs, LogWithDecodedArgs, TokenEvents, ZeroEx } from '../src';
 
 import { chaiSetup } from './utils/chai_setup';
 import { constants } from './utils/constants';
@@ -137,6 +135,7 @@ describe('ZeroEx library', () => {
             const proxyAddress = zeroEx.proxy.getContractAddress();
             const txHash = await zeroEx.token.setUnlimitedProxyAllowanceAsync(zrxTokenAddress, coinbase);
             const txReceiptWithDecodedLogs = await zeroEx.awaitTransactionMinedAsync(txHash);
+            // tslint:disable-next-line:no-unnecessary-type-assertion
             const log = txReceiptWithDecodedLogs.logs[0] as LogWithDecodedArgs<ApprovalContractEventArgs>;
             expect(log.event).to.be.equal(TokenEvents.Approval);
             expect(log.args._owner).to.be.equal(coinbase);

packages/0x.js/test/artifacts_test.ts

@@ -1,5 +1,4 @@
 import { web3Factory } from '@0xproject/dev-utils';
-import * as fs from 'fs';
 import 'make-promises-safe';
 
 import { ZeroEx } from '../src';

packages/0x.js/test/global_hooks.ts

@@ -1,8 +1,6 @@
 import { devConstants } from '@0xproject/dev-utils';
 import { runV1MigrationsAsync } from '@0xproject/migrations';
-import * as path from 'path';
 
-import { constants } from './utils/constants';
 import { provider } from './utils/web3_wrapper';
 
 before('migrate contracts', async function(): Promise<void> {

packages/0x.js/test/utils/web3_wrapper.ts

@@ -1,4 +1,4 @@
-import { devConstants, web3Factory } from '@0xproject/dev-utils';
+import { web3Factory } from '@0xproject/dev-utils';
 import { Provider } from '@0xproject/types';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';