diff --git a/packages/connect/src/utils/orderbook_channel_message_parsers.ts b/packages/connect/src/utils/orderbook_channel_message_parsers.ts
index 486a416ef2..d9a84cca21 100644
--- a/packages/connect/src/utils/orderbook_channel_message_parsers.ts
+++ b/packages/connect/src/utils/orderbook_channel_message_parsers.ts
@@ -5,7 +5,6 @@ import * as _ from 'lodash';
 import {
     OrderbookChannelMessage,
     OrderbookChannelMessageTypes,
-    SignedOrder,
 } from '../types';
 
 import {typeConverters} from './type_converters';
diff --git a/packages/connect/src/ws_orderbook_channel.ts b/packages/connect/src/ws_orderbook_channel.ts
index 6687025c04..f585934848 100644
--- a/packages/connect/src/ws_orderbook_channel.ts
+++ b/packages/connect/src/ws_orderbook_channel.ts
@@ -8,7 +8,6 @@ import {
     OrderbookChannelHandler,
     OrderbookChannelMessageTypes,
     OrderbookChannelSubscriptionOpts,
-    SignedOrder,
     WebsocketClientEventType,
     WebsocketConnectionEventType,
 } from './types';
@@ -99,7 +98,6 @@ export class WebSocketOrderbookChannel implements OrderbookChannel {
             try {
                 const utf8Data = message.utf8Data;
                 const parserResult = orderbookChannelMessageParsers.parser(utf8Data);
-                const type = parserResult.type;
                 if (parserResult.requestId === requestId) {
                     switch (parserResult.type) {
                         case (OrderbookChannelMessageTypes.Snapshot): {
diff --git a/packages/contracts/deploy/migrations/migrate.ts b/packages/contracts/deploy/migrations/migrate.ts
index f40b7c4ba6..e893e6a6f7 100644
--- a/packages/contracts/deploy/migrations/migrate.ts
+++ b/packages/contracts/deploy/migrations/migrate.ts
@@ -1,11 +1,9 @@
 import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import {BigNumber} from 'bignumber.js';
 import * as _ from 'lodash';
-import * as Web3 from 'web3';
 
 import {Deployer} from './../src/deployer';
 import {constants} from './../src/utils/constants';
-import {Token} from './../src/utils/types';
 import {tokenInfo} from './config/token_info';
 
 export const migrator = {
diff --git a/packages/contracts/deploy/src/compiler.ts b/packages/contracts/deploy/src/compiler.ts
index 8a44e94a3e..333a2d0cea 100644
--- a/packages/contracts/deploy/src/compiler.ts
+++ b/packages/contracts/deploy/src/compiler.ts
@@ -1,4 +1,3 @@
-import {promisify} from '@0xproject/utils';
 import * as ethUtil from 'ethereumjs-util';
 import * as _ from 'lodash';
 import * as path from 'path';
@@ -14,7 +13,6 @@ import {
     ContractNetworks,
     ContractSources,
     ImportContents,
-    SolcErrors,
 } from './utils/types';
 import {utils} from './utils/utils';
 
diff --git a/packages/contracts/deploy/src/deployer.ts b/packages/contracts/deploy/src/deployer.ts
index 4c8018ecc7..991504972f 100644
--- a/packages/contracts/deploy/src/deployer.ts
+++ b/packages/contracts/deploy/src/deployer.ts
@@ -1,5 +1,4 @@
 import {TxData} from '@0xproject/types';
-import {promisify} from '@0xproject/utils';
 import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
diff --git a/packages/contracts/deploy/test/deploy_test.ts b/packages/contracts/deploy/test/deploy_test.ts
index 7e7b98f90b..263174a948 100644
--- a/packages/contracts/deploy/test/deploy_test.ts
+++ b/packages/contracts/deploy/test/deploy_test.ts
@@ -4,7 +4,7 @@ import 'mocha';
 import {Compiler} from './../src/compiler';
 import {Deployer} from './../src/deployer';
 import {fsWrapper} from './../src/utils/fs_wrapper';
-import {CompilerOptions, ContractArtifact, ContractData, DeployerOptions, DoneCallback} from './../src/utils/types';
+import {CompilerOptions, ContractArtifact, ContractData, DoneCallback} from './../src/utils/types';
 import {constructor_args, exchange_binary} from './fixtures/exchange_bin';
 import {constants} from './util/constants';
 
diff --git a/packages/contracts/migrations/2_deploy_independent_contracts.ts b/packages/contracts/migrations/2_deploy_independent_contracts.ts
index db9fc370d6..4bf316be6e 100644
--- a/packages/contracts/migrations/2_deploy_independent_contracts.ts
+++ b/packages/contracts/migrations/2_deploy_independent_contracts.ts
@@ -1,5 +1,5 @@
 import {Artifacts} from '../util/artifacts';
-import {ContractInstance, MultiSigConfigByNetwork} from '../util/types';
+import {MultiSigConfigByNetwork} from '../util/types';
 const {
     MultiSigWalletWithTimeLock,
     TokenTransferProxy,
diff --git a/packages/contracts/migrations/3_register_tokens.ts b/packages/contracts/migrations/3_register_tokens.ts
index c72ac15100..f816936283 100644
--- a/packages/contracts/migrations/3_register_tokens.ts
+++ b/packages/contracts/migrations/3_register_tokens.ts
@@ -3,7 +3,7 @@ import * as _ from 'lodash';
 
 import {Artifacts} from '../util/artifacts';
 import {constants} from '../util/constants';
-import {ContractInstance, Token, TokenInfoByNetwork} from '../util/types';
+import {ContractInstance, Token} from '../util/types';
 
 import {tokenInfo} from './config/token_info';
 const {
diff --git a/packages/contracts/test/ts/ether_token_v2.ts b/packages/contracts/test/ts/ether_token_v2.ts
index b88fef579c..61ac4cb578 100644
--- a/packages/contracts/test/ts/ether_token_v2.ts
+++ b/packages/contracts/test/ts/ether_token_v2.ts
@@ -81,7 +81,7 @@ contract('EtherTokenV2', (accounts: string[]) => {
             const logArgs = (logs[0] as any).args;
             expect(logArgs._from).to.equal(expectedFrom);
             expect(logArgs._to).to.equal(expectedTo);
-            expect(logArgs._value).to.be.bignumber.equal(ethToDeposit);
+            expect(logArgs._value).to.be.bignumber.equal(expectedValue);
         });
     });
 
@@ -120,7 +120,6 @@ contract('EtherTokenV2', (accounts: string[]) => {
 
         it('should log 1 event with correct arguments', async () => {
             const initEthTokenBalance = await zeroEx.token.getBalanceAsync(etherTokenAddress, account);
-            const initEthBalance = await getEthBalanceAsync(account);
             const ethTokensToWithdraw = initEthTokenBalance;
             expect(ethTokensToWithdraw).to.not.be.bignumber.equal(0);
             const txHash = await zeroEx.etherToken.withdrawAsync(ethTokensToWithdraw, account, {
@@ -137,7 +136,7 @@ contract('EtherTokenV2', (accounts: string[]) => {
             const logArgs = (logs[0] as any).args;
             expect(logArgs._from).to.equal(expectedFrom);
             expect(logArgs._to).to.equal(expectedTo);
-            expect(logArgs._value).to.be.bignumber.equal(ethTokensToWithdraw);
+            expect(logArgs._value).to.be.bignumber.equal(expectedValue);
         });
     });
 
diff --git a/packages/contracts/test/ts/exchange/core.ts b/packages/contracts/test/ts/exchange/core.ts
index 641084937b..aef2b5a5db 100644
--- a/packages/contracts/test/ts/exchange/core.ts
+++ b/packages/contracts/test/ts/exchange/core.ts
@@ -748,7 +748,6 @@ contract('Exchange', (accounts: string[]) => {
 
             const res = await exWrapper.cancelOrderAsync(order, maker);
             expect(res.logs).to.have.length(1);
-            const errId = res.logs[0].args.errorId.toNumber();
             const errCode = res.logs[0].args.errorId.toNumber();
             expect(errCode).to.be.equal(ExchangeContractErrs.ERROR_ORDER_FULLY_FILLED_OR_CANCELLED);
         });
diff --git a/packages/contracts/test/ts/exchange/wrapper.ts b/packages/contracts/test/ts/exchange/wrapper.ts
index 3097f68876..13a0b60582 100644
--- a/packages/contracts/test/ts/exchange/wrapper.ts
+++ b/packages/contracts/test/ts/exchange/wrapper.ts
@@ -227,8 +227,6 @@ contract('Exchange', (accounts: string[]) => {
 
             it('should throw if a single order does not fill the expected amount', async () => {
                 const fillTakerTokenAmounts: BigNumber[] = [];
-                const makerToken = rep.address;
-                const takerToken = dgd.address;
                 orders.forEach(order => {
                     const fillTakerTokenAmount = order.params.takerTokenAmount.div(2);
                     fillTakerTokenAmounts.push(fillTakerTokenAmount);
@@ -311,7 +309,7 @@ contract('Exchange', (accounts: string[]) => {
                 const cancelTakerTokenAmounts = _.map(orders, order => order.params.takerTokenAmount);
                 await exWrapper.batchCancelOrdersAsync(orders, maker, {cancelTakerTokenAmounts});
 
-                const res = await exWrapper.batchFillOrdersAsync(
+                await exWrapper.batchFillOrdersAsync(
                         orders, taker, {fillTakerTokenAmounts: cancelTakerTokenAmounts});
                 const newBalances = await dmyBalances.getAsync();
                 expect(balances).to.be.deep.equal(newBalances);
diff --git a/packages/contracts/util/crypto.ts b/packages/contracts/util/crypto.ts
index 5253b8c159..2e43ae816e 100644
--- a/packages/contracts/util/crypto.ts
+++ b/packages/contracts/util/crypto.ts
@@ -1,4 +1,3 @@
-import {BigNumber} from 'bignumber.js';
 import BN = require('bn.js');
 import ABI = require('ethereumjs-abi');
 import ethUtil = require('ethereumjs-util');
diff --git a/packages/dev-utils/src/rpc.ts b/packages/dev-utils/src/rpc.ts
index c276b24523..19834dbb4e 100644
--- a/packages/dev-utils/src/rpc.ts
+++ b/packages/dev-utils/src/rpc.ts
@@ -3,7 +3,6 @@ import * as request from 'request-promise-native';
 
 export class RPC {
     private url: string;
-    private port: number;
     private id: number;
     constructor(url: string) {
         this.url = url;
diff --git a/packages/json-schemas/test/schema_test.ts b/packages/json-schemas/test/schema_test.ts
index 8a2f9407d7..067b02827e 100644
--- a/packages/json-schemas/test/schema_test.ts
+++ b/packages/json-schemas/test/schema_test.ts
@@ -1,4 +1,3 @@
-import {promisify} from '@0xproject/utils';
 import BigNumber from 'bignumber.js';
 import * as chai from 'chai';
 import * as dirtyChai from 'dirty-chai';
@@ -16,7 +15,6 @@ const {
     addressSchema,
     ecSignatureSchema,
     ecSignatureParameterSchema,
-    indexFilterValuesSchema,
     orderCancellationRequestsSchema,
     orderFillOrKillRequestsSchema,
     orderFillRequestsSchema,
diff --git a/packages/kovan-faucets/src/ts/error_reporter.ts b/packages/kovan-faucets/src/ts/error_reporter.ts
index db21647c04..bc1844aa2b 100644
--- a/packages/kovan-faucets/src/ts/error_reporter.ts
+++ b/packages/kovan-faucets/src/ts/error_reporter.ts
@@ -1,5 +1,4 @@
 import * as express from 'express';
-import * as fs from 'fs';
 import rollbar = require('rollbar');
 
 import {configs} from './configs';
diff --git a/packages/kovan-faucets/src/ts/utils.ts b/packages/kovan-faucets/src/ts/utils.ts
index 6a0b262e60..893f82ca38 100644
--- a/packages/kovan-faucets/src/ts/utils.ts
+++ b/packages/kovan-faucets/src/ts/utils.ts
@@ -1,6 +1,3 @@
-import * as express from 'express';
-import * as _ from 'lodash';
-
 export const utils = {
     consoleLog(message: string) {
         /* tslint:disable */
diff --git a/packages/kovan-faucets/src/ts/zrx_request_queue.ts b/packages/kovan-faucets/src/ts/zrx_request_queue.ts
index 6e6590e7c5..3b505690f3 100644
--- a/packages/kovan-faucets/src/ts/zrx_request_queue.ts
+++ b/packages/kovan-faucets/src/ts/zrx_request_queue.ts
@@ -1,5 +1,4 @@
 import {ZeroEx} from '0x.js';
-import {promisify} from '@0xproject/utils';
 import BigNumber from 'bignumber.js';
 import * as _ from 'lodash';
 
diff --git a/packages/subproviders/src/subproviders/ledger.ts b/packages/subproviders/src/subproviders/ledger.ts
index 578f6ff6f8..9ffc105a45 100644
--- a/packages/subproviders/src/subproviders/ledger.ts
+++ b/packages/subproviders/src/subproviders/ledger.ts
@@ -1,9 +1,7 @@
 import {assert} from '@0xproject/assert';
 import {addressUtils} from '@0xproject/utils';
-import promisify = require('es6-promisify');
 import EthereumTx = require('ethereumjs-tx');
 import ethUtil = require('ethereumjs-util');
-import * as ledger from 'ledgerco';
 import * as _ from 'lodash';
 import Semaphore from 'semaphore-async-await';
 import Web3 = require('web3');
@@ -23,7 +21,6 @@ const DEFAULT_DERIVATION_PATH = `44'/60'/0'`;
 const NUM_ADDRESSES_TO_FETCH = 10;
 const ASK_FOR_ON_DEVICE_CONFIRMATION = false;
 const SHOULD_GET_CHAIN_CODE = false;
-const HEX_REGEX = /^[0-9A-Fa-f]+$/g;
 
 export class LedgerSubprovider extends Subprovider {
     private _nonceLock: Semaphore;
@@ -34,18 +31,6 @@ export class LedgerSubprovider extends Subprovider {
     private _ledgerEthereumClientFactoryAsync: LedgerEthereumClientFactoryAsync;
     private _ledgerClientIfExists?: LedgerEthereumClient;
     private _shouldAlwaysAskForConfirmation: boolean;
-    private static isValidHex(data: string) {
-        if (!_.isString(data)) {
-            return false;
-        }
-        const isHexPrefixed = data.slice(0, 2) === '0x';
-        if (!isHexPrefixed) {
-            return false;
-        }
-        const nonPrefixed = data.slice(2);
-        const isValid = nonPrefixed.match(HEX_REGEX);
-        return isValid;
-    }
     private static validateSender(sender: string) {
         if (_.isUndefined(sender) || !addressUtils.isAddress(sender)) {
             throw new Error(LedgerSubproviderErrors.SenderInvalidOrNotSupplied);
diff --git a/packages/subproviders/src/subproviders/subprovider.ts b/packages/subproviders/src/subproviders/subprovider.ts
index 64d97b9589..41dde42384 100644
--- a/packages/subproviders/src/subproviders/subprovider.ts
+++ b/packages/subproviders/src/subproviders/subprovider.ts
@@ -11,7 +11,6 @@ import {
  */
 export class Subprovider {
     private engine: any;
-    private currentBlock: any;
     // Ported from: https://github.com/MetaMask/provider-engine/blob/master/util/random-id.js
     private static getRandomId() {
         const extraDigits = 3;
@@ -34,9 +33,6 @@ export class Subprovider {
     }
     public setEngine(engine: any): void {
         this.engine = engine;
-        engine.on('block', (block: any) => {
-            this.currentBlock = block;
-        });
     }
     public async emitPayloadAsync(payload: JSONRPCPayload): Promise<any> {
         const finalPayload = Subprovider.createFinalPayload(payload);
diff --git a/packages/subproviders/src/types.ts b/packages/subproviders/src/types.ts
index 38dc1e67e4..1e7d3eab09 100644
--- a/packages/subproviders/src/types.ts
+++ b/packages/subproviders/src/types.ts
@@ -1,5 +1,4 @@
 import * as _ from 'lodash';
-import * as Web3 from 'web3';
 
 export interface LedgerCommunicationClient {
     close_async: () => Promise<void>;
diff --git a/packages/subproviders/test/integration/ledger_subprovider_test.ts b/packages/subproviders/test/integration/ledger_subprovider_test.ts
index 75f6d47fe5..ab4ffb19ab 100644
--- a/packages/subproviders/test/integration/ledger_subprovider_test.ts
+++ b/packages/subproviders/test/integration/ledger_subprovider_test.ts
@@ -2,20 +2,16 @@ import * as chai from 'chai';
 import promisify = require('es6-promisify');
 import * as ethUtils from 'ethereumjs-util';
 import * as _ from 'lodash';
-import * as mocha from 'mocha';
 import Web3 = require('web3');
 import Web3ProviderEngine = require('web3-provider-engine');
 import RpcSubprovider = require('web3-provider-engine/subproviders/rpc');
 
 import {
-    ECSignature,
     ledgerEthereumNodeJsClientFactoryAsync,
     LedgerSubprovider,
 } from '../../src';
 import {
     DoneCallback,
-    LedgerGetAddressResult,
-    PartialTxParams,
 } from '../../src/types';
 import {chaiSetup} from '../chai_setup';
 import {reportCallbackErrors} from '../utils/report_callback_errors';
diff --git a/packages/subproviders/test/unit/ledger_subprovider_test.ts b/packages/subproviders/test/unit/ledger_subprovider_test.ts
index 964df5db9a..bd4d933253 100644
--- a/packages/subproviders/test/unit/ledger_subprovider_test.ts
+++ b/packages/subproviders/test/unit/ledger_subprovider_test.ts
@@ -6,14 +6,11 @@ import Web3ProviderEngine = require('web3-provider-engine');
 import RpcSubprovider = require('web3-provider-engine/subproviders/rpc');
 
 import {
-    ECSignature,
     LedgerSubprovider,
 } from '../../src';
 import {
     DoneCallback,
-    ECSignatureString,
     LedgerCommunicationClient,
-    LedgerGetAddressResult,
     LedgerSubproviderErrors,
 } from '../../src/types';
 import {chaiSetup} from '../chai_setup';
diff --git a/packages/subproviders/test/unit/redundant_rpc_subprovider_test.ts b/packages/subproviders/test/unit/redundant_rpc_subprovider_test.ts
index edeb1d5a20..2f1676915e 100644
--- a/packages/subproviders/test/unit/redundant_rpc_subprovider_test.ts
+++ b/packages/subproviders/test/unit/redundant_rpc_subprovider_test.ts
@@ -11,6 +11,7 @@ import {chaiSetup} from '../chai_setup';
 import {reportCallbackErrors} from '../utils/report_callback_errors';
 
 const expect = chai.expect;
+chaiSetup.configure();
 
 describe('RedundantRpcSubprovider', () => {
     let provider: Web3ProviderEngine;
diff --git a/packages/tslint-config/rules/walkers/async_suffix.ts b/packages/tslint-config/rules/walkers/async_suffix.ts
index 0c89bd99f6..7fa7a78b80 100644
--- a/packages/tslint-config/rules/walkers/async_suffix.ts
+++ b/packages/tslint-config/rules/walkers/async_suffix.ts
@@ -9,6 +9,7 @@ export class AsyncSuffixWalker extends Lint.RuleWalker {
         const methodName = methodNameNode.getText();
         if (!_.isUndefined(node.type)) {
             if (node.type.kind === ts.SyntaxKind.TypeReference) {
+                // tslint:disable-next-line:no-unnecessary-type-assertion
                 const returnTypeName = (node.type as ts.TypeReferenceNode).typeName.getText();
                 if (returnTypeName === 'Promise' && !methodName.endsWith('Async')) {
                     const failure = this.createFailure(