merge development

59 files changed, 418 insertions, 124 deletions

diff --git a/packages/0x.js/src/schemas/zero_ex_public_network_config_schema.ts b/packages/0x.js/src/schemas/zero_ex_public_network_config_schema.ts
index 9da31481a..f7f6727f0 100644
--- a/packages/0x.js/src/schemas/zero_ex_public_network_config_schema.ts
+++ b/packages/0x.js/src/schemas/zero_ex_public_network_config_schema.ts
@@ -1,9 +1,23 @@
+const networkNameToId: { [networkName: string]: number } = {
+    mainnet: 1,
+    ropsten: 3,
+    rinkeby: 4,
+    kovan: 42,
+    ganache: 50,
+};
+
 export const zeroExPublicNetworkConfigSchema = {
     id: '/ZeroExPublicNetworkConfig',
     properties: {
         networkId: {
             type: 'number',
-            enum: [1, 3, 4, 42, 50],
+            enum: [
+                networkNameToId.mainnet,
+                networkNameToId.ropsten,
+                networkNameToId.rinkeby,
+                networkNameToId.kovan,
+                networkNameToId.ganache,
+            ],
         },
         gasPrice: { $ref: '/Number' },
         zrxContractAddress: { $ref: '/Address' },
diff --git a/packages/0x.js/test/global_hooks.ts b/packages/0x.js/test/global_hooks.ts
index 53b3ef545..fa1dfae38 100644
--- a/packages/0x.js/test/global_hooks.ts
+++ b/packages/0x.js/test/global_hooks.ts
@@ -8,7 +8,8 @@ import { provider } from './utils/web3_wrapper';
 before('migrate contracts', async function(): Promise<void> {
     // HACK: Since the migrations take longer then our global mocha timeout limit
     // we manually increase it for this before hook.
-    this.timeout(20000);
+    const mochaTestTimeoutMs = 20000;
+    this.timeout(mochaTestTimeoutMs);
     const txDefaults = {
         gas: devConstants.GAS_ESTIMATE,
         from: devConstants.TESTRPC_FIRST_ADDRESS,
diff --git a/packages/assert/test/assert_test.ts b/packages/assert/test/assert_test.ts
index 58d3e53b5..e61ec93e0 100644
--- a/packages/assert/test/assert_test.ts
+++ b/packages/assert/test/assert_test.ts
@@ -11,6 +11,7 @@ chai.config.includeStack = true;
 chai.use(dirtyChai);
 const expect = chai.expect;
 
+// tslint:disable:custom-no-magic-numbers
 describe('Assertions', () => {
     const variableName = 'variable';
     describe('#isBigNumber', () => {
@@ -252,3 +253,4 @@ describe('Assertions', () => {
         });
     });
 });
+// tslint:enable:custom-no-magic-numbers
diff --git a/packages/contract-wrappers/src/schemas/contract_wrappers_public_network_config_schema.ts b/packages/contract-wrappers/src/schemas/contract_wrappers_public_network_config_schema.ts
index bf1000afa..304cd100b 100644
--- a/packages/contract-wrappers/src/schemas/contract_wrappers_public_network_config_schema.ts
+++ b/packages/contract-wrappers/src/schemas/contract_wrappers_public_network_config_schema.ts
@@ -1,9 +1,23 @@
+const networkNameToId: { [networkName: string]: number } = {
+    mainnet: 1,
+    ropsten: 3,
+    rinkeby: 4,
+    kovan: 42,
+    ganache: 50,
+};
+
 export const contractWrappersPublicNetworkConfigSchema = {
     id: '/ZeroExContractPublicNetworkConfig',
     properties: {
         networkId: {
             type: 'number',
-            enum: [1, 3, 4, 42, 50],
+            enum: [
+                networkNameToId.mainnet,
+                networkNameToId.kovan,
+                networkNameToId.ropsten,
+                networkNameToId.rinkeby,
+                networkNameToId.ganache,
+            ],
         },
         gasPrice: { $ref: '/Number' },
         zrxContractAddress: { $ref: '/Address' },
diff --git a/packages/contract-wrappers/src/utils/constants.ts b/packages/contract-wrappers/src/utils/constants.ts
index 07da6745d..76d805cac 100644
--- a/packages/contract-wrappers/src/utils/constants.ts
+++ b/packages/contract-wrappers/src/utils/constants.ts
@@ -6,6 +6,7 @@ export const constants = {
     INVALID_JUMP_PATTERN: 'invalid JUMP at',
     OUT_OF_GAS_PATTERN: 'out of gas',
     INVALID_TAKER_FORMAT: 'instance.taker is not of a type(s) string',
+    // tslint:disable-next-line:custom-no-magic-numbers
     UNLIMITED_ALLOWANCE_IN_BASE_UNITS: new BigNumber(2).pow(256).minus(1),
     DEFAULT_BLOCK_POLLING_INTERVAL: 1000,
 };
diff --git a/packages/contract-wrappers/src/utils/filter_utils.ts b/packages/contract-wrappers/src/utils/filter_utils.ts
index c5df7321e..4ec9e256b 100644
--- a/packages/contract-wrappers/src/utils/filter_utils.ts
+++ b/packages/contract-wrappers/src/utils/filter_utils.ts
@@ -73,14 +73,14 @@ export const filterUtils = {
             return false;
         }
         if (!_.isUndefined(filter.topics)) {
-            return filterUtils.matchesTopics(log.topics, filter.topics);
+            return filterUtils.doesMatchTopics(log.topics, filter.topics);
         }
         return true;
     },
-    matchesTopics(logTopics: string[], filterTopics: Array<string[] | string | null>): boolean {
+    doesMatchTopics(logTopics: string[], filterTopics: Array<string[] | string | null>): boolean {
         const matchesTopic = _.zipWith(logTopics, filterTopics, filterUtils.matchesTopic.bind(filterUtils));
-        const matchesTopics = _.every(matchesTopic);
-        return matchesTopics;
+        const doesMatchTopics = _.every(matchesTopic);
+        return doesMatchTopics;
     },
     matchesTopic(logTopic: string, filterTopic: string[] | string | null): boolean {
         if (_.isArray(filterTopic)) {
diff --git a/packages/contract-wrappers/src/utils/utils.ts b/packages/contract-wrappers/src/utils/utils.ts
index af1125632..7cf9450a0 100644
--- a/packages/contract-wrappers/src/utils/utils.ts
+++ b/packages/contract-wrappers/src/utils/utils.ts
@@ -5,7 +5,8 @@ export const utils = {
         return new Error(`Unexpected switch value: ${value} encountered for ${name}`);
     },
     getCurrentUnixTimestampSec(): BigNumber {
-        return new BigNumber(Date.now() / 1000).round();
+        const milisecondsInSecond = 1000;
+        return new BigNumber(Date.now() / milisecondsInSecond).round();
     },
     getCurrentUnixTimestampMs(): BigNumber {
         return new BigNumber(Date.now());
diff --git a/packages/contract-wrappers/test/ether_token_wrapper_test.ts b/packages/contract-wrappers/test/ether_token_wrapper_test.ts
index 974db34b1..e06fe96e5 100644
--- a/packages/contract-wrappers/test/ether_token_wrapper_test.ts
+++ b/packages/contract-wrappers/test/ether_token_wrapper_test.ts
@@ -42,7 +42,7 @@ describe('EtherTokenWrapper', () => {
     let addressWithETH: string;
     let wethContractAddress: string;
     let depositWeiAmount: BigNumber;
-    let decimalPlaces: number;
+    const decimalPlaces = 7;
     let addressWithoutFunds: string;
     const gasPrice = new BigNumber(1);
     const zeroExConfig = {
@@ -60,7 +60,6 @@ describe('EtherTokenWrapper', () => {
         addressWithETH = userAddresses[0];
         wethContractAddress = contractWrappers.etherToken.getContractAddressIfExists() as string;
         depositWeiAmount = Web3Wrapper.toWei(new BigNumber(5));
-        decimalPlaces = 7;
         addressWithoutFunds = userAddresses[1];
     });
     beforeEach(async () => {
@@ -155,6 +154,7 @@ describe('EtherTokenWrapper', () => {
             const preWETHBalance = await contractWrappers.token.getBalanceAsync(wethContractAddress, addressWithETH);
             expect(preWETHBalance).to.be.bignumber.equal(0);
 
+            // tslint:disable-next-line:custom-no-magic-numbers
             const overWETHBalance = preWETHBalance.add(999999999);
 
             return expect(
diff --git a/packages/contract-wrappers/test/global_hooks.ts b/packages/contract-wrappers/test/global_hooks.ts
index 53b3ef545..fa1dfae38 100644
--- a/packages/contract-wrappers/test/global_hooks.ts
+++ b/packages/contract-wrappers/test/global_hooks.ts
@@ -8,7 +8,8 @@ import { provider } from './utils/web3_wrapper';
 before('migrate contracts', async function(): Promise<void> {
     // HACK: Since the migrations take longer then our global mocha timeout limit
     // we manually increase it for this before hook.
-    this.timeout(20000);
+    const mochaTestTimeoutMs = 20000;
+    this.timeout(mochaTestTimeoutMs);
     const txDefaults = {
         gas: devConstants.GAS_ESTIMATE,
         from: devConstants.TESTRPC_FIRST_ADDRESS,
diff --git a/packages/contract-wrappers/test/order_validation_test.ts b/packages/contract-wrappers/test/order_validation_test.ts
index 2acdece3e..a14dc24b6 100644
--- a/packages/contract-wrappers/test/order_validation_test.ts
+++ b/packages/contract-wrappers/test/order_validation_test.ts
@@ -106,6 +106,7 @@ describe('OrderValidation', () => {
         });
         it('should succeed if the order is asymmetric and fillable', async () => {
             const makerFillableAmount = fillableAmount;
+            // tslint:disable-next-line:custom-no-magic-numbers
             const takerFillableAmount = fillableAmount.minus(4);
             const signedOrder = await fillScenarios.createAsymmetricFillableSignedOrderAsync(
                 makerTokenAddress,
@@ -172,6 +173,7 @@ describe('OrderValidation', () => {
                 fillableAmount,
             );
             // 27 <--> 28
+            // tslint:disable-next-line:custom-no-magic-numbers
             signedOrder.ecSignature.v = 28 - signedOrder.ecSignature.v + 27;
             return expect(
                 contractWrappers.exchange.validateFillOrderThrowIfInvalidAsync(
@@ -206,6 +208,7 @@ describe('OrderValidation', () => {
                 takerAddress,
                 fillableAmount,
             );
+            // tslint:disable-next-line:custom-no-magic-numbers
             const nonTakerAddress = userAddresses[6];
             return expect(
                 contractWrappers.exchange.validateFillOrderThrowIfInvalidAsync(
@@ -353,6 +356,7 @@ describe('OrderValidation', () => {
                 takerAddress,
                 zrxTokenAddress,
             );
+            // tslint:disable-next-line:custom-no-magic-numbers
             expect(transferFromAsync.callCount).to.be.equal(4);
             expect(
                 transferFromAsync
@@ -423,6 +427,7 @@ describe('OrderValidation', () => {
                 takerAddress,
                 zrxTokenAddress,
             );
+            // tslint:disable-next-line:custom-no-magic-numbers
             expect(transferFromAsync.callCount).to.be.equal(4);
             expect(
                 transferFromAsync
@@ -491,6 +496,7 @@ describe('OrderValidation', () => {
                 takerAddress,
                 zrxTokenAddress,
             );
+            // tslint:disable-next-line:custom-no-magic-numbers
             expect(transferFromAsync.callCount).to.be.equal(4);
             const makerFillAmount = transferFromAsync.getCall(0).args[3];
             expect(makerFillAmount).to.be.bignumber.equal(makerTokenAmount);
@@ -518,6 +524,7 @@ describe('OrderValidation', () => {
             );
             const makerPartialFee = makerFee.div(2);
             const takerPartialFee = takerFee.div(2);
+            // tslint:disable-next-line:custom-no-magic-numbers
             expect(transferFromAsync.callCount).to.be.equal(4);
             const partialMakerFee = transferFromAsync.getCall(2).args[3];
             expect(partialMakerFee).to.be.bignumber.equal(makerPartialFee);
diff --git a/packages/contracts/test/unlimited_allowance_token.ts b/packages/contracts/test/unlimited_allowance_token.ts
index 8851a04ef..5ad9321e8 100644
--- a/packages/contracts/test/unlimited_allowance_token.ts
+++ b/packages/contracts/test/unlimited_allowance_token.ts
@@ -97,8 +97,8 @@ describe('UnlimitedAllowanceToken', () => {
             const amountToTransfer = ownerBalance;
 
             const spenderAllowance = await zeroEx.token.getAllowanceAsync(tokenAddress, owner, spender);
-            const spenderAllowanceIsInsufficient = spenderAllowance.cmp(amountToTransfer) < 0;
-            expect(spenderAllowanceIsInsufficient).to.be.true();
+            const isSpenderAllowanceInsufficient = spenderAllowance.cmp(amountToTransfer) < 0;
+            expect(isSpenderAllowanceInsufficient).to.be.true();
 
             return expect(
                 token.transferFrom.callAsync(owner, spender, amountToTransfer, {
diff --git a/packages/contracts/test/zrx_token.ts b/packages/contracts/test/zrx_token.ts
index 7a72f85dc..48b8f6e36 100644
--- a/packages/contracts/test/zrx_token.ts
+++ b/packages/contracts/test/zrx_token.ts
@@ -118,8 +118,8 @@ describe('ZRXToken', () => {
             const amountToTransfer = ownerBalance;
 
             const spenderAllowance = await zeroEx.token.getAllowanceAsync(zrxAddress, owner, spender);
-            const spenderAllowanceIsInsufficient = spenderAllowance.cmp(amountToTransfer) < 0;
-            expect(spenderAllowanceIsInsufficient).to.be.true();
+            const isSpenderAllowanceInsufficient = spenderAllowance.cmp(amountToTransfer) < 0;
+            expect(isSpenderAllowanceInsufficient).to.be.true();
 
             const didReturnTrue = await zrxToken.transferFrom.callAsync(owner, spender, amountToTransfer, {
                 from: spender,
diff --git a/packages/contracts/tslint.json b/packages/contracts/tslint.json
index ffaefe83a..1ab924e47 100644
--- a/packages/contracts/tslint.json
+++ b/packages/contracts/tslint.json
@@ -1,3 +1,6 @@
 {
-    "extends": ["@0xproject/tslint-config"]
+    "extends": ["@0xproject/tslint-config"],
+    "rules": {
+        "custom-no-magic-numbers": false
+    }
 }
diff --git a/packages/json-schemas/test/schema_test.ts b/packages/json-schemas/test/schema_test.ts
index ac6a68b59..b9574a0c9 100644
--- a/packages/json-schemas/test/schema_test.ts
+++ b/packages/json-schemas/test/schema_test.ts
@@ -149,7 +149,8 @@ describe('Schema', () => {
     });
     describe('#blockParamSchema', () => {
         it('should validate valid block param', () => {
-            const testCases = [42, 'latest', 'pending', 'earliest'];
+            const blockNumber = 42;
+            const testCases = [blockNumber, 'latest', 'pending', 'earliest'];
             validateAgainstSchema(testCases, blockParamSchema);
         });
         it('should fail for invalid block param', () => {
@@ -182,6 +183,7 @@ describe('Schema', () => {
             validateAgainstSchema(testCases, tokenSchema);
         });
         it('should fail for invalid token', () => {
+            const num = 4;
             const testCases = [
                 {
                     ...token,
@@ -192,7 +194,7 @@ describe('Schema', () => {
                     decimals: undefined,
                 },
                 [],
-                4,
+                num,
             ];
             const shouldFail = true;
             validateAgainstSchema(testCases, tokenSchema, shouldFail);
@@ -871,10 +873,12 @@ describe('Schema', () => {
     });
     describe('#jsNumberSchema', () => {
         it('should validate valid js number', () => {
+            // tslint:disable-next-line:custom-no-magic-numbers
             const testCases = [1, 42];
             validateAgainstSchema(testCases, jsNumber);
         });
         it('should fail for invalid js number', () => {
+            // tslint:disable-next-line:custom-no-magic-numbers
             const testCases = [NaN, -1, new BigNumber(1)];
             const shouldFail = true;
             validateAgainstSchema(testCases, jsNumber, shouldFail);
@@ -882,13 +886,14 @@ describe('Schema', () => {
     });
     describe('#txDataSchema', () => {
         it('should validate valid txData', () => {
+            const bigNumGasAmount = new BigNumber(42);
             const testCases = [
                 {
                     from: NULL_ADDRESS,
                 },
                 {
                     from: NULL_ADDRESS,
-                    gas: new BigNumber(42),
+                    gas: bigNumGasAmount,
                 },
                 {
                     from: NULL_ADDRESS,
diff --git a/packages/migrations/package.json b/packages/migrations/package.json
index ab5204d86..d9e68caaf 100644
--- a/packages/migrations/package.json
+++ b/packages/migrations/package.json
@@ -12,7 +12,7 @@
         "prebuild": "run-s clean compile copy_artifacts generate_contract_wrappers",
         "copy_artifacts": "copyfiles 'artifacts/1.0.0/**/*' ./lib",
         "build": "tsc",
-        "clean": "shx rm -rf lib",
+        "clean": "shx rm -rf lib src/contract_wrappers",
         "lint": "tslint --project .",
         "migrate": "run-s build compile script:migrate",
         "script:migrate": "node ./lib/migrate.js",
diff --git a/packages/migrations/src/migration.ts b/packages/migrations/src/migration.ts
index 57ac311d7..e29414a57 100644
--- a/packages/migrations/src/migration.ts
+++ b/packages/migrations/src/migration.ts
@@ -80,11 +80,12 @@ export const runMigrationsAsync = async (provider: Provider, artifactsDir: strin
         tokenInfo[0].swarmHash,
         { from: owner },
     );
+    const decimals = 18;
     await tokenReg.addToken.sendTransactionAsync(
         zrxToken.address,
         '0x Protocol Token',
         'ZRX',
-        18,
+        decimals,
         NULL_BYTES,
         NULL_BYTES,
         {
@@ -96,7 +97,7 @@ export const runMigrationsAsync = async (provider: Provider, artifactsDir: strin
         etherToken.address,
         'Ether Token',
         'WETH',
-        18,
+        decimals,
         NULL_BYTES,
         NULL_BYTES,
         {
diff --git a/packages/monorepo-scripts/src/postpublish_utils.ts b/packages/monorepo-scripts/src/postpublish_utils.ts
index 22614f01b..f5785343d 100644
--- a/packages/monorepo-scripts/src/postpublish_utils.ts
+++ b/packages/monorepo-scripts/src/postpublish_utils.ts
@@ -158,6 +158,7 @@ export const postpublishUtils = {
             // HACK: tsconfig.json needs wildcard directory endings as `/**/*`
             // but TypeDoc needs it as `/**` in order to pick up files at the root
             if (_.endsWith(includePath, '/**/*')) {
+                // tslint:disable-next-line:custom-no-magic-numbers
                 includePath = includePath.slice(0, -2);
             }
             return includePath;
diff --git a/packages/monorepo-scripts/src/publish.ts b/packages/monorepo-scripts/src/publish.ts
index 5c26475c9..73106821a 100644
--- a/packages/monorepo-scripts/src/publish.ts
+++ b/packages/monorepo-scripts/src/publish.ts
@@ -285,8 +285,8 @@ function shouldAddNewChangelogEntry(currentVersion: string, changelogs: Changelo
         return true;
     }
     const lastEntry = changelogs[0];
-    const lastEntryCurrentVersion = lastEntry.version === currentVersion;
-    return lastEntryCurrentVersion;
+    const isLastEntryCurrentVersion = lastEntry.version === currentVersion;
+    return isLastEntryCurrentVersion;
 }
 
 function generateChangelogMd(changelogs: Changelog[]): string {
diff --git a/packages/order-utils/src/order_hash.ts b/packages/order-utils/src/order_hash.ts
index 1cde72a73..108344a04 100644
--- a/packages/order-utils/src/order_hash.ts
+++ b/packages/order-utils/src/order_hash.ts
@@ -17,7 +17,8 @@ const INVALID_TAKER_FORMAT = 'instance.taker is not of a type(s) string';
  * We do not use BN anywhere else in the codebase.
  */
 function bigNumberToBN(value: BigNumber): BN {
-    return new BN(value.toString(), 10);
+    const base = 10;
+    return new BN(value.toString(), base);
 }
 
 /**
diff --git a/packages/order-utils/src/signature_utils.ts b/packages/order-utils/src/signature_utils.ts
index b511573a8..28a8e7241 100644
--- a/packages/order-utils/src/signature_utils.ts
+++ b/packages/order-utils/src/signature_utils.ts
@@ -72,6 +72,7 @@ export async function signOrderHashAsync(
     // v + r + s OR r + s + v, and different clients (even different versions of the same client)
     // return the signature params in different orders. In order to support all client implementations,
     // we parse the signature in both ways, and evaluate if either one is a valid signature.
+    // tslint:disable-next-line:custom-no-magic-numbers
     const validVParamValues = [27, 28];
     const ecSignatureVRS = parseSignatureHexAsVRS(signature);
     if (_.includes(validVParamValues, ecSignatureVRS.v)) {
@@ -95,11 +96,19 @@ export async function signOrderHashAsync(
 function parseSignatureHexAsVRS(signatureHex: string): ECSignature {
     const signatureBuffer = ethUtil.toBuffer(signatureHex);
     let v = signatureBuffer[0];
-    if (v < 27) {
-        v += 27;
+    // HACK: Sometimes v is returned as [0, 1] and sometimes as [27, 28]
+    // If it is returned as [0, 1], add 27 to both so it becomes [27, 28]
+    const lowestValidV = 27;
+    const isProperlyFormattedV = v < lowestValidV;
+    if (!isProperlyFormattedV) {
+        v += lowestValidV;
     }
-    const r = signatureBuffer.slice(1, 33);
-    const s = signatureBuffer.slice(33, 65);
+    // signatureBuffer contains vrs
+    const vEndIndex = 1;
+    const rsIndex = 33;
+    const r = signatureBuffer.slice(vEndIndex, rsIndex);
+    const sEndIndex = 65;
+    const s = signatureBuffer.slice(rsIndex, sEndIndex);
     const ecSignature: ECSignature = {
         v,
         r: ethUtil.bufferToHex(r),
diff --git a/packages/order-utils/test/signature_utils_test.ts b/packages/order-utils/test/signature_utils_test.ts
index 4b4de9217..e24fa0ce5 100644
--- a/packages/order-utils/test/signature_utils_test.ts
+++ b/packages/order-utils/test/signature_utils_test.ts
@@ -47,12 +47,13 @@ describe('Signature utils', () => {
     });
     describe('#generateSalt', () => {
         it('generates different salts', () => {
-            const equal = generatePseudoRandomSalt().eq(generatePseudoRandomSalt());
-            expect(equal).to.be.false();
+            const isEqual = generatePseudoRandomSalt().eq(generatePseudoRandomSalt());
+            expect(isEqual).to.be.false();
         });
         it('generates salt in range [0..2^256)', () => {
             const salt = generatePseudoRandomSalt();
             expect(salt.greaterThanOrEqualTo(0)).to.be.true();
+            // tslint:disable-next-line:custom-no-magic-numbers
             const twoPow256 = new BigNumber(2).pow(256);
             expect(salt.lessThan(twoPow256)).to.be.true();
         });
@@ -67,7 +68,8 @@ describe('Signature utils', () => {
             expect(isValid).to.be.false();
         });
         it('returns true if order hash is correct', () => {
-            const isValid = isValidOrderHash('0x' + Array(65).join('0'));
+            const orderHashLength = 65;
+            const isValid = isValidOrderHash('0x' + Array(orderHashLength).join('0'));
             expect(isValid).to.be.true();
         });
     });
@@ -111,10 +113,12 @@ describe('Signature utils', () => {
                     if (payload.method === 'eth_sign') {
                         const [address, message] = payload.params;
                         const signature = await web3Wrapper.signMessageAsync(address, message);
+                        // tslint:disable-next-line:custom-no-magic-numbers
+                        const rsvHex = `0x${signature.substr(130)}${signature.substr(2, 128)}`;
                         callback(null, {
                             id: 42,
                             jsonrpc: '2.0',
-                            result: `0x${signature.substr(130)}${signature.substr(2, 128)}`,
+                            result: rsvHex,
                         });
                     } else {
                         callback(null, { id: 42, jsonrpc: '2.0', result: [makerAddress] });
diff --git a/packages/order-watcher/src/order_watcher/order_watcher.ts b/packages/order-watcher/src/order_watcher/order_watcher.ts
index 3c93d6293..29936a066 100644
--- a/packages/order-watcher/src/order_watcher/order_watcher.ts
+++ b/packages/order-watcher/src/order_watcher/order_watcher.ts
@@ -60,6 +60,7 @@ interface OrderStateByOrderHash {
     [orderHash: string]: OrderState;
 }
 
+// tslint:disable-next-line:custom-no-magic-numbers
 const DEFAULT_CLEANUP_JOB_INTERVAL_MS = 1000 * 60 * 60; // 1h
 
 /**
@@ -130,7 +131,8 @@ export class OrderWatcher {
         assert.isValidSignature(orderHash, signedOrder.ecSignature, signedOrder.maker);
         this._orderByOrderHash[orderHash] = signedOrder;
         this._addToDependentOrderHashes(signedOrder, orderHash);
-        const expirationUnixTimestampMs = signedOrder.expirationUnixTimestampSec.times(1000);
+        const milisecondsInASecond = 1000;
+        const expirationUnixTimestampMs = signedOrder.expirationUnixTimestampSec.times(milisecondsInASecond);
         this._expirationWatcher.addOrder(orderHash, expirationUnixTimestampMs);
     }
     /**
diff --git a/packages/order-watcher/src/utils/utils.ts b/packages/order-watcher/src/utils/utils.ts
index af1125632..d34f6b99f 100644
--- a/packages/order-watcher/src/utils/utils.ts
+++ b/packages/order-watcher/src/utils/utils.ts
@@ -5,7 +5,8 @@ export const utils = {
         return new Error(`Unexpected switch value: ${value} encountered for ${name}`);
     },
     getCurrentUnixTimestampSec(): BigNumber {
-        return new BigNumber(Date.now() / 1000).round();
+        const milisecondsInASecond = 1000;
+        return new BigNumber(Date.now() / milisecondsInASecond).round();
     },
     getCurrentUnixTimestampMs(): BigNumber {
         return new BigNumber(Date.now());
diff --git a/packages/order-watcher/test/expiration_watcher_test.ts b/packages/order-watcher/test/expiration_watcher_test.ts
index 8b006f58a..ef15bf006 100644
--- a/packages/order-watcher/test/expiration_watcher_test.ts
+++ b/packages/order-watcher/test/expiration_watcher_test.ts
@@ -22,6 +22,7 @@ import { provider, web3Wrapper } from './utils/web3_wrapper';
 chaiSetup.configure();
 const expect = chai.expect;
 const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
+const MILISECONDS_IN_SECOND = 1000;
 
 describe('ExpirationWatcher', () => {
     let contractWrappers: ContractWrappers;
@@ -84,13 +85,13 @@ describe('ExpirationWatcher', () => {
                 expirationUnixTimestampSec,
             );
             const orderHash = getOrderHashHex(signedOrder);
-            expirationWatcher.addOrder(orderHash, signedOrder.expirationUnixTimestampSec.times(1000));
+            expirationWatcher.addOrder(orderHash, signedOrder.expirationUnixTimestampSec.times(MILISECONDS_IN_SECOND));
             const callbackAsync = callbackErrorReporter.reportNoErrorCallbackErrors(done)((hash: string) => {
                 expect(hash).to.be.equal(orderHash);
                 expect(utils.getCurrentUnixTimestampSec()).to.be.bignumber.gte(expirationUnixTimestampSec);
             });
             expirationWatcher.subscribe(callbackAsync);
-            timer.tick(orderLifetimeSec * 1000);
+            timer.tick(orderLifetimeSec * MILISECONDS_IN_SECOND);
         })().catch(done);
     });
     it("doesn't emit events before order expires", (done: DoneCallback) => {
@@ -106,13 +107,13 @@ describe('ExpirationWatcher', () => {
                 expirationUnixTimestampSec,
             );
             const orderHash = getOrderHashHex(signedOrder);
-            expirationWatcher.addOrder(orderHash, signedOrder.expirationUnixTimestampSec.times(1000));
+            expirationWatcher.addOrder(orderHash, signedOrder.expirationUnixTimestampSec.times(MILISECONDS_IN_SECOND));
             const callbackAsync = callbackErrorReporter.reportNoErrorCallbackErrors(done)(async (hash: string) => {
                 done(new Error('Emitted expiration went before the order actually expired'));
             });
             expirationWatcher.subscribe(callbackAsync);
             const notEnoughTime = orderLifetimeSec - 1;
-            timer.tick(notEnoughTime * 1000);
+            timer.tick(notEnoughTime * MILISECONDS_IN_SECOND);
             done();
         })().catch(done);
     });
@@ -140,8 +141,14 @@ describe('ExpirationWatcher', () => {
             );
             const orderHash1 = getOrderHashHex(signedOrder1);
             const orderHash2 = getOrderHashHex(signedOrder2);
-            expirationWatcher.addOrder(orderHash2, signedOrder2.expirationUnixTimestampSec.times(1000));
-            expirationWatcher.addOrder(orderHash1, signedOrder1.expirationUnixTimestampSec.times(1000));
+            expirationWatcher.addOrder(
+                orderHash2,
+                signedOrder2.expirationUnixTimestampSec.times(MILISECONDS_IN_SECOND),
+            );
+            expirationWatcher.addOrder(
+                orderHash1,
+                signedOrder1.expirationUnixTimestampSec.times(MILISECONDS_IN_SECOND),
+            );
             const expirationOrder = [orderHash1, orderHash2];
             const expectToBeCalledOnce = false;
             const callbackAsync = callbackErrorReporter.reportNoErrorCallbackErrors(done, expectToBeCalledOnce)(
@@ -154,7 +161,7 @@ describe('ExpirationWatcher', () => {
                 },
             );
             expirationWatcher.subscribe(callbackAsync);
-            timer.tick(order2Lifetime * 1000);
+            timer.tick(order2Lifetime * MILISECONDS_IN_SECOND);
         })().catch(done);
     });
     it('emits events in correct order when expirations are equal', (done: DoneCallback) => {
@@ -181,8 +188,14 @@ describe('ExpirationWatcher', () => {
             );
             const orderHash1 = getOrderHashHex(signedOrder1);
             const orderHash2 = getOrderHashHex(signedOrder2);
-            expirationWatcher.addOrder(orderHash1, signedOrder1.expirationUnixTimestampSec.times(1000));
-            expirationWatcher.addOrder(orderHash2, signedOrder2.expirationUnixTimestampSec.times(1000));
+            expirationWatcher.addOrder(
+                orderHash1,
+                signedOrder1.expirationUnixTimestampSec.times(MILISECONDS_IN_SECOND),
+            );
+            expirationWatcher.addOrder(
+                orderHash2,
+                signedOrder2.expirationUnixTimestampSec.times(MILISECONDS_IN_SECOND),
+            );
             const expirationOrder = orderHash1 < orderHash2 ? [orderHash1, orderHash2] : [orderHash2, orderHash1];
             const expectToBeCalledOnce = false;
             const callbackAsync = callbackErrorReporter.reportNoErrorCallbackErrors(done, expectToBeCalledOnce)(
@@ -195,7 +208,7 @@ describe('ExpirationWatcher', () => {
                 },
             );
             expirationWatcher.subscribe(callbackAsync);
-            timer.tick(order2Lifetime * 1000);
+            timer.tick(order2Lifetime * MILISECONDS_IN_SECOND);
         })().catch(done);
     });
 });
diff --git a/packages/order-watcher/test/global_hooks.ts b/packages/order-watcher/test/global_hooks.ts
index 03eab0e13..d4d033dd4 100644
--- a/packages/order-watcher/test/global_hooks.ts
+++ b/packages/order-watcher/test/global_hooks.ts
@@ -9,7 +9,8 @@ import { provider } from './utils/web3_wrapper';
 before('migrate contracts', async function(): Promise<void> {
     // HACK: Since the migrations take longer then our global mocha timeout limit
     // we manually increase it for this before hook.
-    this.timeout(20000);
+    const mochaTestTimeoutMs = 20000;
+    this.timeout(mochaTestTimeoutMs);
     const txDefaults = {
         gas: devConstants.GAS_ESTIMATE,
         from: devConstants.TESTRPC_FIRST_ADDRESS,
diff --git a/packages/order-watcher/test/order_watcher_test.ts b/packages/order-watcher/test/order_watcher_test.ts
index dc8e544b1..0d33e7ea2 100644
--- a/packages/order-watcher/test/order_watcher_test.ts
+++ b/packages/order-watcher/test/order_watcher_test.ts
@@ -269,8 +269,8 @@ describe('OrderWatcher', () => {
         });
         it('should trigger the callback when orders backing ZRX allowance changes', (done: DoneCallback) => {
             (async () => {
-                const makerFee = Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18);
-                const takerFee = Web3Wrapper.toBaseUnitAmount(new BigNumber(0), 18);
+                const makerFee = Web3Wrapper.toBaseUnitAmount(new BigNumber(2), decimals);
+                const takerFee = Web3Wrapper.toBaseUnitAmount(new BigNumber(0), decimals);
                 signedOrder = await fillScenarios.createFillableSignedOrderWithFeesAsync(
                     makerToken.address,
                     takerToken.address,
diff --git a/packages/react-docs/src/docs_info.ts b/packages/react-docs/src/docs_info.ts
index e9c84b7c9..6f4f39f00 100644
--- a/packages/react-docs/src/docs_info.ts
+++ b/packages/react-docs/src/docs_info.ts
@@ -64,8 +64,8 @@ export class DocsInfo {
         finalMenu.contracts = _.filter(finalMenu.contracts, (contractName: string) => {
             const versionIntroducedIfExists = this._docsInfo.menuSubsectionToVersionWhenIntroduced[contractName];
             if (!_.isUndefined(versionIntroducedIfExists)) {
-                const existsInSelectedVersion = compareVersions(selectedVersion, versionIntroducedIfExists) >= 0;
-                return existsInSelectedVersion;
+                const doesExistInSelectedVersion = compareVersions(selectedVersion, versionIntroducedIfExists) >= 0;
+                return doesExistInSelectedVersion;
             } else {
                 return true;
             }
diff --git a/packages/react-docs/tslint.json b/packages/react-docs/tslint.json
index ee918e360..c78434416 100644
--- a/packages/react-docs/tslint.json
+++ b/packages/react-docs/tslint.json
@@ -3,6 +3,7 @@
     "rules": {
         "no-object-literal-type-assertion": false,
         "completed-docs": false,
-        "prefer-function-over-method": false
+        "prefer-function-over-method": false,
+        "custom-no-magic-numbers": false
     }
 }
diff --git a/packages/react-shared/tslint.json b/packages/react-shared/tslint.json
index ee918e360..c78434416 100644
--- a/packages/react-shared/tslint.json
+++ b/packages/react-shared/tslint.json
@@ -3,6 +3,7 @@
     "rules": {
         "no-object-literal-type-assertion": false,
         "completed-docs": false,
-        "prefer-function-over-method": false
+        "prefer-function-over-method": false,
+        "custom-no-magic-numbers": false
     }
 }
diff --git a/packages/sol-compiler/src/compiler.ts b/packages/sol-compiler/src/compiler.ts
index efb30091b..c17616246 100644
--- a/packages/sol-compiler/src/compiler.ts
+++ b/packages/sol-compiler/src/compiler.ts
@@ -152,7 +152,8 @@ export class Compiler {
             logUtils.log(`Downloading ${fullSolcVersion}...`);
             const url = `${constants.BASE_COMPILER_URL}${fullSolcVersion}`;
             const response = await fetch(url);
-            if (response.status !== 200) {
+            const SUCCESS_STATUS = 200;
+            if (response.status !== SUCCESS_STATUS) {
                 throw new Error(`Failed to load ${fullSolcVersion}`);
             }
             solcjs = await response.text();
diff --git a/packages/sol-compiler/test/compiler_test.ts b/packages/sol-compiler/test/compiler_test.ts
index dc8eb1c4e..991965caa 100644
--- a/packages/sol-compiler/test/compiler_test.ts
+++ b/packages/sol-compiler/test/compiler_test.ts
@@ -39,8 +39,13 @@ describe('#Compiler', function(): void {
         const exchangeArtifactString = await fsWrapper.readFileAsync(exchangeArtifactPath, opts);
         const exchangeArtifact: ContractArtifact = JSON.parse(exchangeArtifactString);
         // The last 43 bytes of the binaries are metadata which may not be equivalent
-        const unlinkedBinaryWithoutMetadata = exchangeArtifact.compilerOutput.evm.bytecode.object.slice(2, -86);
-        const exchangeBinaryWithoutMetadata = exchange_binary.slice(0, -86);
+        const metadataByteLength = 43;
+        const metadataHexLength = metadataByteLength * 2;
+        const unlinkedBinaryWithoutMetadata = exchangeArtifact.compilerOutput.evm.bytecode.object.slice(
+            2,
+            -metadataHexLength,
+        );
+        const exchangeBinaryWithoutMetadata = exchange_binary.slice(0, -metadataHexLength);
         expect(unlinkedBinaryWithoutMetadata).to.equal(exchangeBinaryWithoutMetadata);
     });
 });
diff --git a/packages/sol-cov/test/collect_coverage_entries_test.ts b/packages/sol-cov/test/collect_coverage_entries_test.ts
index 82012edfa..a03be19cd 100644
--- a/packages/sol-cov/test/collect_coverage_entries_test.ts
+++ b/packages/sol-cov/test/collect_coverage_entries_test.ts
@@ -40,12 +40,14 @@ describe('Collect coverage entries', () => {
             const coverageEntries = collectCoverageEntries(simpleStorageContract);
             const fnIds = _.keys(coverageEntries.fnMap);
             expect(coverageEntries.fnMap[fnIds[0]].name).to.be.equal('set');
+            // tslint:disable-next-line:custom-no-magic-numbers
             expect(coverageEntries.fnMap[fnIds[0]].line).to.be.equal(5);
             const setFunction = `function set(uint x) {
         storedData = x;
     }`;
             expect(getRange(simpleStorageContract, coverageEntries.fnMap[fnIds[0]].loc)).to.be.equal(setFunction);
             expect(coverageEntries.fnMap[fnIds[1]].name).to.be.equal('get');
+            // tslint:disable-next-line:custom-no-magic-numbers
             expect(coverageEntries.fnMap[fnIds[1]].line).to.be.equal(8);
             const getFunction = `function get() constant returns (uint retVal) {
         return storedData;
@@ -122,6 +124,7 @@ describe('Collect coverage entries', () => {
 
             const branchDescriptions = _.values(coverageEntries.branchMap);
             const branchLines = _.map(branchDescriptions, branchDescription => branchDescription.line);
+            // tslint:disable-next-line:custom-no-magic-numbers
             expect(branchLines).to.be.deep.equal([94, 115, 119, 130, 151, 187]);
             const branchTypes = _.map(branchDescriptions, branchDescription => branchDescription.type);
             expect(branchTypes).to.be.deep.equal(['if', 'if', 'if', 'if', 'binary-expr', 'if']);
diff --git a/packages/sol-cov/test/instructions_test.ts b/packages/sol-cov/test/instructions_test.ts
index f66612f5f..8012674f5 100644
--- a/packages/sol-cov/test/instructions_test.ts
+++ b/packages/sol-cov/test/instructions_test.ts
@@ -12,6 +12,7 @@ const expect = chai.expect;
 describe('instructions', () => {
     describe('#getPcToInstructionIndexMapping', () => {
         it('correctly maps pcs to instruction indexed', () => {
+            // tslint:disable-next-line:custom-no-magic-numbers
             const bytecode = new Uint8Array([constants.PUSH1, 42, constants.PUSH2, 1, 2, constants.TIMESTAMP]);
             const pcToInstruction = getPcToInstructionIndexMapping(bytecode);
             const expectedPcToInstruction = { '0': 0, '2': 1, '5': 2 };
diff --git a/packages/sra-report/src/index.ts b/packages/sra-report/src/index.ts
index 9a203b654..3b72ad44e 100644
--- a/packages/sra-report/src/index.ts
+++ b/packages/sra-report/src/index.ts
@@ -13,7 +13,18 @@ import { postmanEnvironmentFactory } from './postman_environment_factory';
 import { utils } from './utils';
 
 const DEFAULT_NETWORK_ID = 1;
-const SUPPORTED_NETWORK_IDS = [1, 3, 4, 42];
+const networkNameToId: { [networkName: string]: number } = {
+    mainnet: 1,
+    ropsten: 3,
+    rinkeby: 4,
+    kovan: 42,
+};
+const SUPPORTED_NETWORK_IDS = [
+    networkNameToId.mainnet,
+    networkNameToId.ropsten,
+    networkNameToId.rinkeby,
+    networkNameToId.kovan,
+];
 
 // extract command line arguments
 const args = yargs
diff --git a/packages/sra-report/src/postman_environment_factory.ts b/packages/sra-report/src/postman_environment_factory.ts
index 42389aea2..e899aaa79 100644
--- a/packages/sra-report/src/postman_environment_factory.ts
+++ b/packages/sra-report/src/postman_environment_factory.ts
@@ -11,6 +11,12 @@ import { addresses as rinkebyAddresses } from './contract_addresses/rinkeby_addr
 import { addresses as ropstenAddresses } from './contract_addresses/ropsten_addresses';
 
 const ENVIRONMENT_NAME = 'SRA Report';
+const networkNameToId: { [networkName: string]: number } = {
+    mainnet: 1,
+    ropsten: 3,
+    rinkeby: 4,
+    kovan: 42,
+};
 
 export interface EnvironmentValue {
     key: string;
@@ -107,13 +113,13 @@ async function createOrderEnvironmentValuesAsync(url: string): Promise<Environme
 }
 function getContractAddresses(networkId: number): Addresses {
     switch (networkId) {
-        case 1:
+        case networkNameToId.mainnet:
             return mainnetAddresses;
-        case 3:
+        case networkNameToId.ropsten:
             return ropstenAddresses;
-        case 4:
+        case networkNameToId.rinkeby:
             return rinkebyAddresses;
-        case 42:
+        case networkNameToId.kovan:
             return kovanAddresses;
         default:
             throw new Error('Unsupported network id');
diff --git a/packages/sra-report/test/test_runner.ts b/packages/sra-report/test/test_runner.ts
index 5ea3cdc4d..fe238e98a 100644
--- a/packages/sra-report/test/test_runner.ts
+++ b/packages/sra-report/test/test_runner.ts
@@ -24,6 +24,7 @@ const expect = chai.expect;
 
 const CONTENT_TYPE_ASSERTION_NAME = 'Has Content-Type header with value application/json';
 const SCHEMA_ASSERTION_NAME = 'Schema is valid';
+const SUCCESS_STATUS = 200;
 const baseNewmanRunOptions = {
     collection: sraReportCollectionJSON,
     environment: postmanEnvironmentJSON,
@@ -46,7 +47,7 @@ export const testRunner = {
         };
         describe(CONTENT_TYPE_ASSERTION_NAME, () => {
             it('fails when there are no headers', async () => {
-                nockInterceptor.reply(200, {});
+                nockInterceptor.reply(SUCCESS_STATUS, {});
                 const summary = await utils.newmanRunAsync(newmanRunOptions);
                 const error = findAssertionErrorIfExists(
                     summary,
@@ -61,7 +62,7 @@ export const testRunner = {
                 const headers = {
                     'Content-Type': 'text/html',
                 };
-                nockInterceptor.reply(200, {}, headers);
+                nockInterceptor.reply(SUCCESS_STATUS, {}, headers);
                 const summary = await utils.newmanRunAsync(newmanRunOptions);
                 const error = findAssertionErrorIfExists(
                     summary,
@@ -76,7 +77,7 @@ export const testRunner = {
                 const headers = {
                     'Content-Type': 'charset=utf-8; application/json',
                 };
-                nockInterceptor.reply(200, {}, headers);
+                nockInterceptor.reply(SUCCESS_STATUS, {}, headers);
                 const summary = await utils.newmanRunAsync(newmanRunOptions);
                 const error = findAssertionErrorIfExists(
                     summary,
@@ -100,7 +101,7 @@ export const testRunner = {
         };
         describe(SCHEMA_ASSERTION_NAME, () => {
             it('fails when schema is invalid', async () => {
-                nockInterceptor.reply(200, malformedJson);
+                nockInterceptor.reply(SUCCESS_STATUS, malformedJson);
                 const summary = await utils.newmanRunAsync(newmanRunOptions);
                 const error = findAssertionErrorIfExists(summary, postmanCollectionRequestName, SCHEMA_ASSERTION_NAME);
                 const errorMessage = _.get(error, 'message');
@@ -108,7 +109,7 @@ export const testRunner = {
                 expect(errorMessage).to.equal('expected false to be true');
             });
             it('passes when schema is valid', async () => {
-                nockInterceptor.reply(200, correctJson);
+                nockInterceptor.reply(SUCCESS_STATUS, correctJson);
                 const summary = await utils.newmanRunAsync(newmanRunOptions);
                 const error = findAssertionErrorIfExists(summary, postmanCollectionRequestName, SCHEMA_ASSERTION_NAME);
                 const errorMessage = _.get(error, 'message');
diff --git a/packages/subproviders/src/subproviders/ledger.ts b/packages/subproviders/src/subproviders/ledger.ts
index 347eda55f..467299db0 100644
--- a/packages/subproviders/src/subproviders/ledger.ts
+++ b/packages/subproviders/src/subproviders/ledger.ts
@@ -113,9 +113,12 @@ export class LedgerSubprovider extends BaseWalletSubprovider {
         const tx = new EthereumTx(txParams);
 
         // Set the EIP155 bits
-        tx.raw[6] = Buffer.from([this._networkId]); // v
-        tx.raw[7] = Buffer.from([]); // r
-        tx.raw[8] = Buffer.from([]); // s
+        const vIndex = 6;
+        tx.raw[vIndex] = Buffer.from([this._networkId]); // v
+        const rIndex = 7;
+        tx.raw[rIndex] = Buffer.from([]); // r
+        const sIndex = 8;
+        tx.raw[sIndex] = Buffer.from([]); // s
 
         const txHex = tx.serialize().toString('hex');
         try {
@@ -127,7 +130,8 @@ export class LedgerSubprovider extends BaseWalletSubprovider {
             tx.v = Buffer.from(result.v, 'hex');
 
             // EIP155: v should be chain_id * 2 + {35, 36}
-            const signedChainId = Math.floor((tx.v[0] - 35) / 2);
+            const eip55Constant = 35;
+            const signedChainId = Math.floor((tx.v[0] - eip55Constant) / 2);
             if (signedChainId !== this._networkId) {
                 await this._destroyLedgerClientAsync();
                 const err = new Error(LedgerSubproviderErrors.TooOldLedgerFirmware);
@@ -169,8 +173,10 @@ export class LedgerSubprovider extends BaseWalletSubprovider {
                 fullDerivationPath,
                 ethUtil.stripHexPrefix(data),
             );
-            const v = result.v - 27;
-            let vHex = v.toString(16);
+            const lowestValidV = 27;
+            const v = result.v - lowestValidV;
+            const hexBase = 16;
+            let vHex = v.toString(hexBase);
             if (vHex.length < 2) {
                 vHex = `0${v}`;
             }
diff --git a/packages/subproviders/src/subproviders/nonce_tracker.ts b/packages/subproviders/src/subproviders/nonce_tracker.ts
index 907330111..345e5e975 100644
--- a/packages/subproviders/src/subproviders/nonce_tracker.ts
+++ b/packages/subproviders/src/subproviders/nonce_tracker.ts
@@ -93,7 +93,8 @@ export class NonceTrackerSubprovider extends Subprovider {
         // Increment the nonce from the previous successfully submitted transaction
         let nonce = ethUtil.bufferToInt(transaction.nonce);
         nonce++;
-        let nextHexNonce = nonce.toString(16);
+        const hexBase = 16;
+        let nextHexNonce = nonce.toString(hexBase);
         if (nextHexNonce.length % 2) {
             nextHexNonce = `0${nextHexNonce}`;
         }
diff --git a/packages/subproviders/src/subproviders/subprovider.ts b/packages/subproviders/src/subproviders/subprovider.ts
index 56d2381a0..cb6dffc4a 100644
--- a/packages/subproviders/src/subproviders/subprovider.ts
+++ b/packages/subproviders/src/subproviders/subprovider.ts
@@ -13,10 +13,11 @@ export abstract class Subprovider {
     // Ported from: https://github.com/MetaMask/provider-engine/blob/master/util/random-id.js
     private static _getRandomId(): number {
         const extraDigits = 3;
+        const baseTen = 10;
         // 13 time digits
-        const datePart = new Date().getTime() * Math.pow(10, extraDigits);
+        const datePart = new Date().getTime() * Math.pow(baseTen, extraDigits);
         // 3 random digits
-        const extraPart = Math.floor(Math.random() * Math.pow(10, extraDigits));
+        const extraPart = Math.floor(Math.random() * Math.pow(baseTen, extraDigits));
         // 16 digits
         return datePart + extraPart;
     }
diff --git a/packages/subproviders/src/utils/wallet_utils.ts b/packages/subproviders/src/utils/wallet_utils.ts
index cd5cd9ba0..c36fdb9fc 100644
--- a/packages/subproviders/src/utils/wallet_utils.ts
+++ b/packages/subproviders/src/utils/wallet_utils.ts
@@ -30,10 +30,10 @@ class DerivedHDKeyInfoIterator implements IterableIterator<DerivedHDKeyInfo> {
             baseDerivationPath,
             derivationPath: fullDerivationPath,
         };
-        const done = this._index === this._searchLimit;
+        const isDone = this._index === this._searchLimit;
         this._index++;
         return {
-            done,
+            done: isDone,
             value: derivedKey,
         };
     }
diff --git a/packages/subproviders/test/integration/ledger_subprovider_test.ts b/packages/subproviders/test/integration/ledger_subprovider_test.ts
index 70fd2cfce..d3e9d0fde 100644
--- a/packages/subproviders/test/integration/ledger_subprovider_test.ts
+++ b/packages/subproviders/test/integration/ledger_subprovider_test.ts
@@ -20,6 +20,8 @@ import { reportCallbackErrors } from '../utils/report_callback_errors';
 
 chaiSetup.configure();
 const expect = chai.expect;
+const DEFAULT_NUM_ACCOUNTS = 10;
+const EXPECTED_SIGNATURE_LENGTH = 132;
 
 async function ledgerEthereumNodeJsClientFactoryAsync(): Promise<LedgerEthereumClient> {
     const ledgerConnection = await TransportNodeHid.create();
@@ -41,7 +43,7 @@ describe('LedgerSubprovider', () => {
         it('returns default number of accounts', async () => {
             const accounts = await ledgerSubprovider.getAccountsAsync();
             expect(accounts[0]).to.not.be.an('undefined');
-            expect(accounts.length).to.be.equal(10);
+            expect(accounts.length).to.be.equal(DEFAULT_NUM_ACCOUNTS);
         });
         it('returns the expected accounts from a ledger set up with the test mnemonic', async () => {
             const accounts = await ledgerSubprovider.getAccountsAsync();
@@ -105,7 +107,7 @@ describe('LedgerSubprovider', () => {
             };
             const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
                 expect(err).to.be.a('null');
-                expect(response.result.length).to.be.equal(10);
+                expect(response.result.length).to.be.equal(DEFAULT_NUM_ACCOUNTS);
                 done();
             });
             ledgerProvider.sendAsync(payload, callback);
@@ -123,7 +125,7 @@ describe('LedgerSubprovider', () => {
                 };
                 const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
                     expect(err).to.be.a('null');
-                    expect(response.result.length).to.be.equal(132);
+                    expect(response.result.length).to.be.equal(EXPECTED_SIGNATURE_LENGTH);
                     expect(response.result.substr(0, 2)).to.be.equal('0x');
                     done();
                 });
@@ -143,7 +145,7 @@ describe('LedgerSubprovider', () => {
                 };
                 const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
                     expect(err).to.be.a('null');
-                    expect(response.result.length).to.be.equal(132);
+                    expect(response.result.length).to.be.equal(EXPECTED_SIGNATURE_LENGTH);
                     expect(response.result.substr(0, 2)).to.be.equal('0x');
                     done();
                 });
@@ -197,7 +199,8 @@ describe('LedgerSubprovider', () => {
                 const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
                     expect(err).to.be.a('null');
                     const result = response.result;
-                    expect(result.length).to.be.equal(66);
+                    const signedTxLength = 66;
+                    expect(result.length).to.be.equal(signedTxLength);
                     expect(result.substr(0, 2)).to.be.equal('0x');
                     done();
                 });
diff --git a/packages/subproviders/test/unit/ledger_subprovider_test.ts b/packages/subproviders/test/unit/ledger_subprovider_test.ts
index 6455454cb..8571f7d11 100644
--- a/packages/subproviders/test/unit/ledger_subprovider_test.ts
+++ b/packages/subproviders/test/unit/ledger_subprovider_test.ts
@@ -21,6 +21,7 @@ import { reportCallbackErrors } from '../utils/report_callback_errors';
 chaiSetup.configure();
 const expect = chai.expect;
 const FAKE_ADDRESS = '0xb088a3bc93f71b4de97b9de773e9647645983688';
+const DEFAULT_NUM_ACCOUNTS = 10;
 
 describe('LedgerSubprovider', () => {
     const networkId: number = 42;
@@ -73,7 +74,7 @@ describe('LedgerSubprovider', () => {
             it('returns default number of accounts', async () => {
                 const accounts = await ledgerSubprovider.getAccountsAsync();
                 expect(accounts[0]).to.be.equal(FAKE_ADDRESS);
-                expect(accounts.length).to.be.equal(10);
+                expect(accounts.length).to.be.equal(DEFAULT_NUM_ACCOUNTS);
             });
             it('returns requested number of accounts', async () => {
                 const numberOfAccounts = 20;
@@ -119,7 +120,7 @@ describe('LedgerSubprovider', () => {
                 };
                 const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
                     expect(err).to.be.a('null');
-                    expect(response.result.length).to.be.equal(10);
+                    expect(response.result.length).to.be.equal(DEFAULT_NUM_ACCOUNTS);
                     expect(response.result[0]).to.be.equal(FAKE_ADDRESS);
                     done();
                 });
@@ -176,7 +177,8 @@ describe('LedgerSubprovider', () => {
                 };
                 const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
                     expect(err).to.be.a('null');
-                    expect(response.result.raw.length).to.be.equal(192);
+                    const rawTxLength = 192;
+                    expect(response.result.raw.length).to.be.equal(rawTxLength);
                     expect(response.result.raw.substr(0, 2)).to.be.equal('0x');
                     done();
                 });
diff --git a/packages/subproviders/test/unit/mnemonic_wallet_subprovider_test.ts b/packages/subproviders/test/unit/mnemonic_wallet_subprovider_test.ts
index 52b636ac2..90565181e 100644
--- a/packages/subproviders/test/unit/mnemonic_wallet_subprovider_test.ts
+++ b/packages/subproviders/test/unit/mnemonic_wallet_subprovider_test.ts
@@ -18,6 +18,7 @@ import { reportCallbackErrors } from '../utils/report_callback_errors';
 
 chaiSetup.configure();
 const expect = chai.expect;
+const DEFAULT_NUM_ACCOUNTS = 10;
 
 describe('MnemonicWalletSubprovider', () => {
     let subprovider: MnemonicWalletSubprovider;
@@ -33,7 +34,7 @@ describe('MnemonicWalletSubprovider', () => {
                 const accounts = await subprovider.getAccountsAsync();
                 expect(accounts[0]).to.be.equal(fixtureData.TEST_RPC_ACCOUNT_0);
                 expect(accounts[1]).to.be.equal(fixtureData.TEST_RPC_ACCOUNT_1);
-                expect(accounts.length).to.be.equal(10);
+                expect(accounts.length).to.be.equal(DEFAULT_NUM_ACCOUNTS);
             });
             it('signs a personal message', async () => {
                 const data = ethUtils.bufferToHex(ethUtils.toBuffer(fixtureData.PERSONAL_MESSAGE_STRING));
@@ -90,7 +91,7 @@ describe('MnemonicWalletSubprovider', () => {
                 const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
                     expect(err).to.be.a('null');
                     expect(response.result[0]).to.be.equal(fixtureData.TEST_RPC_ACCOUNT_0);
-                    expect(response.result.length).to.be.equal(10);
+                    expect(response.result.length).to.be.equal(DEFAULT_NUM_ACCOUNTS);
                     done();
                 });
                 provider.sendAsync(payload, callback);
diff --git a/packages/subproviders/test/unit/redundant_rpc_subprovider_test.ts b/packages/subproviders/test/unit/redundant_rpc_subprovider_test.ts
index f9c47f141..fdbbb332c 100644
--- a/packages/subproviders/test/unit/redundant_rpc_subprovider_test.ts
+++ b/packages/subproviders/test/unit/redundant_rpc_subprovider_test.ts
@@ -14,6 +14,7 @@ import { reportCallbackErrors } from '../utils/report_callback_errors';
 
 const expect = chai.expect;
 chaiSetup.configure();
+const DEFAULT_NUM_ACCOUNTS = 10;
 
 describe('RedundantSubprovider', () => {
     let provider: Web3ProviderEngine;
@@ -32,7 +33,7 @@ describe('RedundantSubprovider', () => {
         };
         const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
             expect(err).to.be.a('null');
-            expect(response.result.length).to.be.equal(10);
+            expect(response.result.length).to.be.equal(DEFAULT_NUM_ACCOUNTS);
             done();
         });
         provider.sendAsync(payload, callback);
@@ -55,7 +56,7 @@ describe('RedundantSubprovider', () => {
         };
         const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
             expect(err).to.be.a('null');
-            expect(response.result.length).to.be.equal(10);
+            expect(response.result.length).to.be.equal(DEFAULT_NUM_ACCOUNTS);
             done();
         });
         provider.sendAsync(payload, callback);
diff --git a/packages/testnet-faucets/src/ts/constants.ts b/packages/testnet-faucets/src/ts/constants.ts
new file mode 100644
index 000000000..c6370e3f6
--- /dev/null
+++ b/packages/testnet-faucets/src/ts/constants.ts
@@ -0,0 +1,5 @@
+export const constants = {
+    SUCCESS_STATUS: 200,
+    SERVICE_UNAVAILABLE_STATUS: 503,
+    BAD_REQUEST_STATUS: 400,
+};
diff --git a/packages/testnet-faucets/src/ts/handler.ts b/packages/testnet-faucets/src/ts/handler.ts
index 3858b5339..d5f0dc2f9 100644
--- a/packages/testnet-faucets/src/ts/handler.ts
+++ b/packages/testnet-faucets/src/ts/handler.ts
@@ -15,6 +15,7 @@ import ProviderEngine = require('web3-provider-engine');
 import RpcSubprovider = require('web3-provider-engine/subproviders/rpc');
 
 import { configs } from './configs';
+import { constants } from './constants';
 import { DispatchQueue } from './dispatch_queue';
 import { dispenseAssetTasks } from './dispense_asset_tasks';
 import { rpcUrls } from './rpc_urls';
@@ -80,7 +81,7 @@ export class Handler {
             };
         });
         const payload = JSON.stringify(queueInfo);
-        res.status(200).send(payload);
+        res.status(constants.SUCCESS_STATUS).send(payload);
     }
     public dispenseEther(req: express.Request, res: express.Response): void {
         this._dispenseAsset(req, res, RequestedAssetType.ETH);
@@ -120,11 +121,11 @@ export class Handler {
         }
         const didAddToQueue = networkConfig.dispatchQueue.add(dispenserTask);
         if (!didAddToQueue) {
-            res.status(503).send('QUEUE_IS_FULL');
+            res.status(constants.SERVICE_UNAVAILABLE_STATUS).send('QUEUE_IS_FULL');
             return;
         }
         logUtils.log(`Added ${recipient} to queue: ${requestedAssetType} networkId: ${networkId}`);
-        res.status(200).end();
+        res.status(constants.SUCCESS_STATUS).end();
     }
     private async _dispenseOrderAsync(
         req: express.Request,
@@ -133,7 +134,7 @@ export class Handler {
     ): Promise<void> {
         const networkConfig = _.get(this._networkConfigByNetworkId, req.params.networkId);
         if (_.isUndefined(networkConfig)) {
-            res.status(400).send('UNSUPPORTED_NETWORK_ID');
+            res.status(constants.BAD_REQUEST_STATUS).send('UNSUPPORTED_NETWORK_ID');
             return;
         }
         const zeroEx = networkConfig.zeroEx;
@@ -173,6 +174,6 @@ export class Handler {
         const signedOrderHash = ZeroEx.getOrderHashHex(signedOrder);
         const payload = JSON.stringify(signedOrder);
         logUtils.log(`Dispensed signed order: ${payload}`);
-        res.status(200).send(payload);
+        res.status(constants.SUCCESS_STATUS).send(payload);
     }
 }
diff --git a/packages/testnet-faucets/src/ts/parameter_transformer.ts b/packages/testnet-faucets/src/ts/parameter_transformer.ts
index 58bf154dc..b9929a0d9 100644
--- a/packages/testnet-faucets/src/ts/parameter_transformer.ts
+++ b/packages/testnet-faucets/src/ts/parameter_transformer.ts
@@ -3,6 +3,7 @@ import { NextFunction, Request, Response } from 'express';
 import * as _ from 'lodash';
 
 import { configs } from './configs';
+import { constants } from './constants';
 import { rpcUrls } from './rpc_urls';
 
 const DEFAULT_NETWORK_ID = 42; // kovan
@@ -11,7 +12,7 @@ export const parameterTransformer = {
     transform(req: Request, res: Response, next: NextFunction): void {
         const recipientAddress = req.params.recipient;
         if (_.isUndefined(recipientAddress) || !addressUtils.isAddress(recipientAddress)) {
-            res.status(400).send('INVALID_RECIPIENT_ADDRESS');
+            res.status(constants.BAD_REQUEST_STATUS).send('INVALID_RECIPIENT_ADDRESS');
             return;
         }
         const lowerCaseRecipientAddress = recipientAddress.toLowerCase();
@@ -19,7 +20,7 @@ export const parameterTransformer = {
         const networkId = _.get(req.query, 'networkId', DEFAULT_NETWORK_ID);
         const rpcUrlIfExists = _.get(rpcUrls, networkId);
         if (_.isUndefined(rpcUrlIfExists)) {
-            res.status(400).send('UNSUPPORTED_NETWORK_ID');
+            res.status(constants.BAD_REQUEST_STATUS).send('UNSUPPORTED_NETWORK_ID');
             return;
         }
         req.params.networkId = networkId;
diff --git a/packages/testnet-faucets/src/ts/server.ts b/packages/testnet-faucets/src/ts/server.ts
index 198a5fdc9..55c1d55d8 100644
--- a/packages/testnet-faucets/src/ts/server.ts
+++ b/packages/testnet-faucets/src/ts/server.ts
@@ -1,6 +1,7 @@
 import * as bodyParser from 'body-parser';
 import * as express from 'express';
 
+import { constants } from './constants';
 import { errorReporter } from './error_reporter';
 import { Handler } from './handler';
 import { parameterTransformer } from './parameter_transformer';
@@ -18,7 +19,7 @@ app.use((req, res, next) => {
 
 const handler = new Handler();
 app.get('/ping', (req: express.Request, res: express.Response) => {
-    res.status(200).send('pong');
+    res.status(constants.SUCCESS_STATUS).send('pong');
 });
 app.get('/info', handler.getQueueInfo.bind(handler));
 app.get('/ether/:recipient', parameterTransformer.transform, handler.dispenseEther.bind(handler));
@@ -28,5 +29,6 @@ app.get('/order/zrx/:recipient', parameterTransformer.transform, handler.dispens
 
 // Log to rollbar any errors unhandled by handlers
 app.use(errorReporter.errorHandler());
-const port = process.env.PORT || 3000;
+const DEFAULT_PORT = 3000;
+const port = process.env.PORT || DEFAULT_PORT;
 app.listen(port);
diff --git a/packages/tslint-config/package.json b/packages/tslint-config/package.json
index 317ae4591..75cf03b05 100644
--- a/packages/tslint-config/package.json
+++ b/packages/tslint-config/package.json
@@ -45,7 +45,8 @@
         "lodash": "^4.17.4",
         "tslint": "5.8.0",
         "tslint-eslint-rules": "^4.1.1",
-        "tslint-react": "^3.2.0"
+        "tslint-react": "^3.2.0",
+        "tsutils": "^2.12.1"
     },
     "publishConfig": {
         "access": "public"
diff --git a/packages/tslint-config/rules/booleanNamingRule.ts b/packages/tslint-config/rules/booleanNamingRule.ts
new file mode 100644
index 000000000..f673afc6a
--- /dev/null
+++ b/packages/tslint-config/rules/booleanNamingRule.ts
@@ -0,0 +1,68 @@
+import * as _ from 'lodash';
+import * as Lint from 'tslint';
+import * as ts from 'typescript';
+
+const VALID_BOOLEAN_PREFIXES = ['is', 'does', 'should', 'was', 'has', 'can', 'did', 'would'];
+
+export class Rule extends Lint.Rules.TypedRule {
+    public static FAILURE_STRING = `Boolean variable names should begin with: ${VALID_BOOLEAN_PREFIXES.join(', ')}`;
+
+    public applyWithProgram(sourceFile: ts.SourceFile, program: ts.Program): Lint.RuleFailure[] {
+        return this.applyWithFunction(sourceFile, walk, undefined, program.getTypeChecker());
+    }
+}
+
+function walk(ctx: Lint.WalkContext<void>, tc: ts.TypeChecker): void {
+    traverse(ctx.sourceFile);
+
+    function traverse(node: ts.Node): void {
+        checkNodeForViolations(ctx, node, tc);
+        return ts.forEachChild(node, traverse);
+    }
+}
+
+function checkNodeForViolations(ctx: Lint.WalkContext<void>, node: ts.Node, tc: ts.TypeChecker): void {
+    switch (node.kind) {
+        // Handle: const { timestamp } = ...
+        case ts.SyntaxKind.BindingElement: {
+            const bindingElementNode = node as ts.BindingElement;
+            if (bindingElementNode.name.kind === ts.SyntaxKind.Identifier) {
+                handleBooleanNaming(bindingElementNode, tc, ctx);
+            }
+            break;
+        }
+
+        // Handle regular assignments: const block = ...
+        case ts.SyntaxKind.VariableDeclaration:
+            const variableDeclarationNode = node as ts.VariableDeclaration;
+            if (variableDeclarationNode.name.kind === ts.SyntaxKind.Identifier) {
+                handleBooleanNaming(node as ts.VariableDeclaration, tc, ctx);
+            }
+            break;
+
+        default:
+            _.noop();
+    }
+}
+
+function handleBooleanNaming(
+    node: ts.VariableDeclaration | ts.BindingElement,
+    tc: ts.TypeChecker,
+    ctx: Lint.WalkContext<void>,
+): void {
+    const nodeName = node.name;
+    const variableName = nodeName.getText();
+    const lowercasedName = _.toLower(variableName);
+    const typeNode = tc.getTypeAtLocation(node);
+    const typeName = (typeNode as any).intrinsicName;
+    if (typeName === 'boolean') {
+        const hasProperName = !_.isUndefined(
+            _.find(VALID_BOOLEAN_PREFIXES, prefix => {
+                return _.startsWith(lowercasedName, prefix);
+            }),
+        );
+        if (!hasProperName) {
+            ctx.addFailureAtNode(node, Rule.FAILURE_STRING);
+        }
+    }
+}
diff --git a/packages/tslint-config/rules/customNoMagicNumbersRule.ts b/packages/tslint-config/rules/customNoMagicNumbersRule.ts
new file mode 100644
index 000000000..e358221eb
--- /dev/null
+++ b/packages/tslint-config/rules/customNoMagicNumbersRule.ts
@@ -0,0 +1,76 @@
+import * as Lint from 'tslint';
+import { isPrefixUnaryExpression } from 'tsutils';
+import * as ts from 'typescript';
+
+/**
+ * A modified version of the no-magic-numbers rule that allows for magic numbers
+ * when instantiating a BigNumber instance.
+ * E.g We want to be able to write:
+ *     const amount = new BigNumber(5);
+ * Original source: https://github.com/palantir/tslint/blob/42b058a6baa688f8be8558b277eb056c3ff79818/src/rules/noMagicNumbersRule.ts
+ */
+export class Rule extends Lint.Rules.AbstractRule {
+    public static ALLOWED_NODES = new Set<ts.SyntaxKind>([
+        ts.SyntaxKind.ExportAssignment,
+        ts.SyntaxKind.FirstAssignment,
+        ts.SyntaxKind.LastAssignment,
+        ts.SyntaxKind.PropertyAssignment,
+        ts.SyntaxKind.ShorthandPropertyAssignment,
+        ts.SyntaxKind.VariableDeclaration,
+        ts.SyntaxKind.VariableDeclarationList,
+        ts.SyntaxKind.EnumMember,
+        ts.SyntaxKind.PropertyDeclaration,
+        ts.SyntaxKind.Parameter,
+    ]);
+
+    public static DEFAULT_ALLOWED = [-1, 0, 1];
+
+    public apply(sourceFile: ts.SourceFile): Lint.RuleFailure[] {
+        const allowedNumbers = this.ruleArguments.length > 0 ? this.ruleArguments : Rule.DEFAULT_ALLOWED;
+        return this.applyWithWalker(
+            new CustomNoMagicNumbersWalker(sourceFile, this.ruleName, new Set(allowedNumbers.map(String))),
+        );
+    }
+}
+
+// tslint:disable-next-line:max-classes-per-file
+class CustomNoMagicNumbersWalker extends Lint.AbstractWalker<Set<string>> {
+    public static FAILURE_STRING = "'magic numbers' are not allowed";
+    private static _isNegativeNumberLiteral(
+        node: ts.Node,
+    ): node is ts.PrefixUnaryExpression & { operand: ts.NumericLiteral } {
+        return (
+            isPrefixUnaryExpression(node) &&
+            node.operator === ts.SyntaxKind.MinusToken &&
+            node.operand.kind === ts.SyntaxKind.NumericLiteral
+        );
+    }
+    public walk(sourceFile: ts.SourceFile): void {
+        const cb = (node: ts.Node): void => {
+            if (node.kind === ts.SyntaxKind.NumericLiteral) {
+                return this.checkNumericLiteral(node, (node as ts.NumericLiteral).text);
+            }
+            if (CustomNoMagicNumbersWalker._isNegativeNumberLiteral(node)) {
+                return this.checkNumericLiteral(node, `-${(node.operand as ts.NumericLiteral).text}`);
+            }
+            return ts.forEachChild(node, cb);
+        };
+        return ts.forEachChild(sourceFile, cb);
+    }
+
+    // tslint:disable:no-non-null-assertion
+    // tslint:disable-next-line:underscore-private-and-protected
+    private checkNumericLiteral(node: ts.Node, num: string): void {
+        if (!Rule.ALLOWED_NODES.has(node.parent!.kind) && !this.options.has(num)) {
+            if (node.parent!.kind === ts.SyntaxKind.NewExpression) {
+                const className = (node.parent! as any).expression.escapedText;
+                const BIG_NUMBER_NEW_EXPRESSION = 'BigNumber';
+                if (className === BIG_NUMBER_NEW_EXPRESSION) {
+                    return; // noop
+                }
+            }
+            this.addFailureAtNode(node, CustomNoMagicNumbersWalker.FAILURE_STRING);
+        }
+    }
+    // tslint:enable:no-non-null-assertion
+}
diff --git a/packages/tslint-config/tslint.json b/packages/tslint-config/tslint.json
index 1d717430d..77a1f41cc 100644
--- a/packages/tslint-config/tslint.json
+++ b/packages/tslint-config/tslint.json
@@ -5,7 +5,10 @@
         "arrow-parens": [true, "ban-single-arg-parens"],
         "arrow-return-shorthand": true,
         "async-suffix": true,
+        "boolean-naming": true,
+        "no-switch-case-fall-through": true,
         "await-promise": true,
+        "custom-no-magic-numbers": [true, 0, 1, 2, 3, -1],
         "binary-expression-operand-order": true,
         "callable-types": true,
         "class-name": true,
diff --git a/packages/utils/src/abi_decoder.ts b/packages/utils/src/abi_decoder.ts
index d329f917a..c78bfa343 100644
--- a/packages/utils/src/abi_decoder.ts
+++ b/packages/utils/src/abi_decoder.ts
@@ -23,7 +23,8 @@ export class AbiDecoder {
             formatted = formatted.slice(2);
         }
 
-        formatted = _.padStart(formatted, 40, '0');
+        const addressLength = 40;
+        formatted = _.padStart(formatted, addressLength, '0');
         return `0x${formatted}`;
     }
     constructor(abiArrays: AbiDefinition[][]) {
@@ -45,16 +46,17 @@ export class AbiDecoder {
         const dataTypes = _.map(nonIndexedInputs, input => input.type);
         const decodedData = ethersInterface.events[event.name].parse(log.data);
 
-        let failedToDecode = false;
+        let didFailToDecode = false;
         _.forEach(event.inputs, (param: EventParameter, i: number) => {
             // Indexed parameters are stored in topics. Non-indexed ones in decodedData
             let value: BigNumber | string | number = param.indexed ? log.topics[topicsIndex++] : decodedData[i];
             if (_.isUndefined(value)) {
-                failedToDecode = true;
+                didFailToDecode = true;
                 return;
             }
             if (param.type === SolidityTypes.Address) {
-                value = AbiDecoder._padZeros(new BigNumber(value).toString(16));
+                const baseHex = 16;
+                value = AbiDecoder._padZeros(new BigNumber(value).toString(baseHex));
             } else if (param.type === SolidityTypes.Uint256 || param.type === SolidityTypes.Uint) {
                 value = new BigNumber(value);
             } else if (param.type === SolidityTypes.Uint8) {
@@ -63,7 +65,7 @@ export class AbiDecoder {
             decodedParams[param.name] = value;
         });
 
-        if (failedToDecode) {
+        if (didFailToDecode) {
             return log;
         } else {
             return {
diff --git a/packages/utils/src/address_utils.ts b/packages/utils/src/address_utils.ts
index f94985441..e25bde249 100644
--- a/packages/utils/src/address_utils.ts
+++ b/packages/utils/src/address_utils.ts
@@ -9,11 +9,16 @@ export const addressUtils = {
         const unprefixedAddress = address.replace('0x', '');
         const addressHash = jsSHA3.keccak256(unprefixedAddress.toLowerCase());
 
-        for (let i = 0; i < 40; i++) {
+        const addressLength = 40;
+        for (let i = 0; i < addressLength; i++) {
             // The nth letter should be uppercase if the nth digit of casemap is 1
+            const hexBase = 16;
+            const lowercaseRange = 7;
             if (
-                (parseInt(addressHash[i], 16) > 7 && unprefixedAddress[i].toUpperCase() !== unprefixedAddress[i]) ||
-                (parseInt(addressHash[i], 16) <= 7 && unprefixedAddress[i].toLowerCase() !== unprefixedAddress[i])
+                (parseInt(addressHash[i], hexBase) > lowercaseRange &&
+                    unprefixedAddress[i].toUpperCase() !== unprefixedAddress[i]) ||
+                (parseInt(addressHash[i], hexBase) <= lowercaseRange &&
+                    unprefixedAddress[i].toLowerCase() !== unprefixedAddress[i])
             ) {
                 return false;
             }
diff --git a/packages/utils/src/interval_utils.ts b/packages/utils/src/interval_utils.ts
index 6984bf42d..6784d5b35 100644
--- a/packages/utils/src/interval_utils.ts
+++ b/packages/utils/src/interval_utils.ts
@@ -6,18 +6,18 @@ export const intervalUtils = {
         intervalMs: number,
         onError: (err: Error) => void,
     ): NodeJS.Timer {
-        let locked = false;
+        let isLocked = false;
         const intervalId = setInterval(async () => {
-            if (locked) {
+            if (isLocked) {
                 return;
             } else {
-                locked = true;
+                isLocked = true;
                 try {
                     await fn();
                 } catch (err) {
                     onError(err);
                 }
-                locked = false;
+                isLocked = false;
             }
         }, intervalMs);
         return intervalId;
diff --git a/packages/web3-wrapper/src/web3_wrapper.ts b/packages/web3-wrapper/src/web3_wrapper.ts
index c60d5fe33..91a1af870 100644
--- a/packages/web3-wrapper/src/web3_wrapper.ts
+++ b/packages/web3-wrapper/src/web3_wrapper.ts
@@ -19,6 +19,8 @@ import * as Web3 from 'web3';
 
 import { Web3WrapperErrors } from './types';
 
+const BASE_TEN = 10;
+
 /**
  * A wrapper around the Web3.js 0.x library that provides a consistent, clean promise-based interface.
  */
@@ -48,7 +50,7 @@ export class Web3Wrapper {
      * @return  The amount in units.
      */
     public static toUnitAmount(amount: BigNumber, decimals: number): BigNumber {
-        const aUnit = new BigNumber(10).pow(decimals);
+        const aUnit = new BigNumber(BASE_TEN).pow(decimals);
         const unit = amount.div(aUnit);
         return unit;
     }
@@ -61,7 +63,7 @@ export class Web3Wrapper {
      * @return  The amount in baseUnits.
      */
     public static toBaseUnitAmount(amount: BigNumber, decimals: number): BigNumber {
-        const unit = new BigNumber(10).pow(decimals);
+        const unit = new BigNumber(BASE_TEN).pow(decimals);
         const baseUnitAmount = amount.times(unit);
         const hasDecimals = baseUnitAmount.decimalPlaces() !== 0;
         if (hasDecimals) {
@@ -180,8 +182,8 @@ export class Web3Wrapper {
     public async doesContractExistAtAddressAsync(address: string): Promise<boolean> {
         const code = await promisify<string>(this._web3.eth.getCode)(address);
         // Regex matches 0x0, 0x00, 0x in order to accommodate poorly implemented clients
-        const codeIsEmpty = /^0x0{0,40}$/i.test(code);
-        return !codeIsEmpty;
+        const isCodeEmpty = /^0x0{0,40}$/i.test(code);
+        return !isCodeEmpty;
     }
     /**
      * Sign a message with a specific address's private key (`eth_sign`)
@@ -336,16 +338,16 @@ export class Web3Wrapper {
         pollingIntervalMs: number = 1000,
         timeoutMs?: number,
     ): Promise<TransactionReceiptWithDecodedLogs> {
-        let timeoutExceeded = false;
+        let wasTimeoutExceeded = false;
         if (timeoutMs) {
-            setTimeout(() => (timeoutExceeded = true), timeoutMs);
+            setTimeout(() => (wasTimeoutExceeded = true), timeoutMs);
         }
 
         const txReceiptPromise = new Promise(
             (resolve: (receipt: TransactionReceiptWithDecodedLogs) => void, reject) => {
                 const intervalId = intervalUtils.setAsyncExcludingInterval(
                     async () => {
-                        if (timeoutExceeded) {
+                        if (wasTimeoutExceeded) {
                             intervalUtils.clearAsyncExcludingInterval(intervalId);
                             return reject(Web3WrapperErrors.TransactionMiningTimeout);
                         }
diff --git a/packages/website/ts/components/generate_order/new_token_form.tsx b/packages/website/ts/components/generate_order/new_token_form.tsx
index 10f71b430..a9b8e9589 100644
--- a/packages/website/ts/components/generate_order/new_token_form.tsx
+++ b/packages/website/ts/components/generate_order/new_token_form.tsx
@@ -157,14 +157,14 @@ export class NewTokenForm extends React.Component<NewTokenFormProps, NewTokenFor
         const maxLength = 30;
         const tokens = _.values(this.props.tokenByAddress);
         const tokenWithNameIfExists = _.find(tokens, { name });
-        const tokenWithNameExists = !_.isUndefined(tokenWithNameIfExists);
+        const doesTokenWithNameExists = !_.isUndefined(tokenWithNameIfExists);
         if (name === '') {
             nameErrText = 'Name is required';
         } else if (!this._isValidName(name)) {
             nameErrText = 'Name should only contain letters, digits and spaces';
         } else if (name.length > maxLength) {
             nameErrText = `Max length is ${maxLength}`;
-        } else if (tokenWithNameExists) {
+        } else if (doesTokenWithNameExists) {
             nameErrText = 'Token with this name already exists';
         }
 
@@ -177,14 +177,14 @@ export class NewTokenForm extends React.Component<NewTokenFormProps, NewTokenFor
         let symbolErrText = '';
         const maxLength = 5;
         const tokens = _.values(this.props.tokenByAddress);
-        const tokenWithSymbolExists = !_.isUndefined(_.find(tokens, { symbol }));
+        const doesTokenWithSymbolExists = !_.isUndefined(_.find(tokens, { symbol }));
         if (symbol === '') {
             symbolErrText = 'Symbol is required';
         } else if (!this._isAlphanumeric(symbol)) {
             symbolErrText = 'Can only include alphanumeric characters';
         } else if (symbol.length > maxLength) {
             symbolErrText = `Max length is ${maxLength}`;
-        } else if (tokenWithSymbolExists) {
+        } else if (doesTokenWithSymbolExists) {
             symbolErrText = 'Token with symbol already exists';
         }
 
diff --git a/packages/website/ts/components/relayer_index/relayer_index.tsx b/packages/website/ts/components/relayer_index/relayer_index.tsx
index 8da4e0e10..9ef6eaf59 100644
--- a/packages/website/ts/components/relayer_index/relayer_index.tsx
+++ b/packages/website/ts/components/relayer_index/relayer_index.tsx
@@ -60,8 +60,8 @@ export class RelayerIndex extends React.Component<RelayerIndexProps, RelayerInde
         this._isUnmounted = true;
     }
     public render(): React.ReactNode {
-        const readyToRender = _.isUndefined(this.state.error) && !_.isUndefined(this.state.relayerInfos);
-        if (!readyToRender) {
+        const isReadyToRender = _.isUndefined(this.state.error) && !_.isUndefined(this.state.relayerInfos);
+        if (!isReadyToRender) {
             return (
                 // TODO: consolidate this loading component with the one in portal
                 <div className="center">
diff --git a/packages/website/tslint.json b/packages/website/tslint.json
index d6a5f5031..b55ffe90f 100644
--- a/packages/website/tslint.json
+++ b/packages/website/tslint.json
@@ -4,6 +4,7 @@
         "no-implicit-dependencies": false,
         "no-object-literal-type-assertion": false,
         "completed-docs": false,
-        "prefer-function-over-method": false
+        "prefer-function-over-method": false,
+        "custom-no-magic-numbers": false
     }
 }