Merge pull request #585 from 0xProject/feature/typedef

Add missing type definitions. Enable typedef linter rule

153 files changed, 655 insertions, 600 deletions

diff --git a/packages/0x.js/package.json b/packages/0x.js/package.json
index d048c8be6..36ea0751f 100644
--- a/packages/0x.js/package.json
+++ b/packages/0x.js/package.json
@@ -103,6 +103,7 @@
         "@0xproject/order-utils": "^0.0.4",
         "@0xproject/types": "^0.6.3",
         "@0xproject/typescript-typings": "^0.3.1",
+        "@0xproject/sol-compiler": "^0.4.3",
         "@0xproject/utils": "^0.6.1",
         "@0xproject/web3-wrapper": "^0.6.3",
         "ethers": "^3.0.15",
diff --git a/packages/0x.js/src/0x.ts b/packages/0x.js/src/0x.ts
index e0192d5ef..206954a0b 100644
--- a/packages/0x.js/src/0x.ts
+++ b/packages/0x.js/src/0x.ts
@@ -200,7 +200,7 @@ export class ZeroEx {
      */
     public async awaitTransactionMinedAsync(
         txHash: string,
-        pollingIntervalMs = 1000,
+        pollingIntervalMs: number = 1000,
         timeoutMs?: number,
     ): Promise<TransactionReceiptWithDecodedLogs> {
         // Hack: Get Web3Wrapper from ContractWrappers
diff --git a/packages/0x.js/test/global_hooks.ts b/packages/0x.js/test/global_hooks.ts
index 88f202761..53b3ef545 100644
--- a/packages/0x.js/test/global_hooks.ts
+++ b/packages/0x.js/test/global_hooks.ts
@@ -5,7 +5,7 @@ import * as path from 'path';
 import { constants } from './utils/constants';
 import { provider } from './utils/web3_wrapper';
 
-before('migrate contracts', async function() {
+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);
diff --git a/packages/0x.js/test/utils/chai_setup.ts b/packages/0x.js/test/utils/chai_setup.ts
index 078edd309..1a8733093 100644
--- a/packages/0x.js/test/utils/chai_setup.ts
+++ b/packages/0x.js/test/utils/chai_setup.ts
@@ -4,7 +4,7 @@ import ChaiBigNumber = require('chai-bignumber');
 import * as dirtyChai from 'dirty-chai';
 
 export const chaiSetup = {
-    configure() {
+    configure(): void {
         chai.config.includeStack = true;
         chai.use(ChaiBigNumber());
         chai.use(dirtyChai);
diff --git a/packages/abi-gen/src/index.ts b/packages/abi-gen/src/index.ts
index a280f2e63..ef5710f53 100644
--- a/packages/abi-gen/src/index.ts
+++ b/packages/abi-gen/src/index.ts
@@ -61,14 +61,13 @@ const args = yargs
         'Full usage example',
     ).argv;
 
-function registerPartials(partialsGlob: string) {
+function registerPartials(partialsGlob: string): void {
     const partialTemplateFileNames = globSync(partialsGlob);
     logUtils.log(`Found ${chalk.green(`${partialTemplateFileNames.length}`)} ${chalk.bold('partial')} templates`);
     for (const partialTemplateFileName of partialTemplateFileNames) {
         const namedContent = utils.getNamedContent(partialTemplateFileName);
         Handlebars.registerPartial(namedContent.name, namedContent.content);
     }
-    return partialsGlob;
 }
 
 function writeOutputFile(name: string, renderedTsCode: string): void {
diff --git a/packages/assert/src/index.ts b/packages/assert/src/index.ts
index 938daab92..f3b3651d5 100644
--- a/packages/assert/src/index.ts
+++ b/packages/assert/src/index.ts
@@ -10,7 +10,7 @@ export const assert = {
         const isBigNumber = _.isObject(value) && (value as any).isBigNumber;
         this.assert(isBigNumber, this.typeAssertionMessage(variableName, 'BigNumber', value));
     },
-    isValidBaseUnitAmount(variableName: string, value: BigNumber) {
+    isValidBaseUnitAmount(variableName: string, value: BigNumber): void {
         assert.isBigNumber(variableName, value);
         const isNegative = value.lessThan(0);
         this.assert(!isNegative, `${variableName} cannot be a negative number, found value: ${value.toNumber()}`);
diff --git a/packages/connect/src/ws_orderbook_channel.ts b/packages/connect/src/ws_orderbook_channel.ts
index 5aa730d8f..4a9d4058f 100644
--- a/packages/connect/src/ws_orderbook_channel.ts
+++ b/packages/connect/src/ws_orderbook_channel.ts
@@ -91,7 +91,7 @@ export class WebSocketOrderbookChannel implements OrderbookChannel {
     /**
      * Close the websocket and stop receiving updates
      */
-    public close() {
+    public close(): void {
         if (!_.isUndefined(this._connectionIfExists)) {
             this._connectionIfExists.close();
         }
@@ -99,7 +99,7 @@ export class WebSocketOrderbookChannel implements OrderbookChannel {
             clearInterval(this._heartbeatTimerIfExists);
         }
     }
-    private _getConnection(callback: (error?: Error, connection?: WebSocket.connection) => void) {
+    private _getConnection(callback: (error?: Error, connection?: WebSocket.connection) => void): void {
         if (!_.isUndefined(this._connectionIfExists) && this._connectionIfExists.connected) {
             callback(undefined, this._connectionIfExists);
         } else {
diff --git a/packages/contract-wrappers/src/utils/assert.ts b/packages/contract-wrappers/src/utils/assert.ts
index 2588a4d09..c74ed341f 100644
--- a/packages/contract-wrappers/src/utils/assert.ts
+++ b/packages/contract-wrappers/src/utils/assert.ts
@@ -12,7 +12,7 @@ import { isValidSignature } from '@0xproject/order-utils';
 
 export const assert = {
     ...sharedAssert,
-    isValidSignature(orderHash: string, ecSignature: ECSignature, signerAddress: string) {
+    isValidSignature(orderHash: string, ecSignature: ECSignature, signerAddress: string): void {
         const isValid = isValidSignature(orderHash, ecSignature, signerAddress);
         this.assert(isValid, `Expected order with hash '${orderHash}' to have a valid signature`);
     },
diff --git a/packages/contract-wrappers/src/utils/decorators.ts b/packages/contract-wrappers/src/utils/decorators.ts
index 64123143c..494575e7b 100644
--- a/packages/contract-wrappers/src/utils/decorators.ts
+++ b/packages/contract-wrappers/src/utils/decorators.ts
@@ -39,7 +39,7 @@ const asyncErrorHandlerFactory = (errorTransformer: ErrorTransformer) => {
         // Do not use arrow syntax here. Use a function expression in
         // order to use the correct value of `this` in this method
         // tslint:disable-next-line:only-arrow-functions
-        descriptor.value = async function(...args: any[]) {
+        descriptor.value = async function(...args: any[]): Promise<any> {
             try {
                 const result = await originalMethod.apply(this, args);
                 return result;
@@ -66,7 +66,7 @@ const syncErrorHandlerFactory = (errorTransformer: ErrorTransformer) => {
         // Do not use arrow syntax here. Use a function expression in
         // order to use the correct value of `this` in this method
         // tslint:disable-next-line:only-arrow-functions
-        descriptor.value = function(...args: any[]) {
+        descriptor.value = function(...args: any[]): any {
             try {
                 const result = originalMethod.apply(this, args);
                 return result;
diff --git a/packages/contract-wrappers/src/utils/order_validation_utils.ts b/packages/contract-wrappers/src/utils/order_validation_utils.ts
index 36dfbd800..362c605de 100644
--- a/packages/contract-wrappers/src/utils/order_validation_utils.ts
+++ b/packages/contract-wrappers/src/utils/order_validation_utils.ts
@@ -86,12 +86,12 @@ export class OrderValidationUtils {
     private static _validateRemainingFillAmountNotZeroOrThrow(
         takerTokenAmount: BigNumber,
         unavailableTakerTokenAmount: BigNumber,
-    ) {
+    ): void {
         if (takerTokenAmount.eq(unavailableTakerTokenAmount)) {
             throw new Error(ExchangeContractErrs.OrderRemainingFillAmountZero);
         }
     }
-    private static _validateOrderNotExpiredOrThrow(expirationUnixTimestampSec: BigNumber) {
+    private static _validateOrderNotExpiredOrThrow(expirationUnixTimestampSec: BigNumber): void {
         const currentUnixTimestampSec = utils.getCurrentUnixTimestampSec();
         if (expirationUnixTimestampSec.lessThan(currentUnixTimestampSec)) {
             throw new Error(ExchangeContractErrs.OrderFillExpired);
diff --git a/packages/contracts/test/utils/chai_setup.ts b/packages/contracts/test/utils/chai_setup.ts
index 078edd309..1a8733093 100644
--- a/packages/contracts/test/utils/chai_setup.ts
+++ b/packages/contracts/test/utils/chai_setup.ts
@@ -4,7 +4,7 @@ import ChaiBigNumber = require('chai-bignumber');
 import * as dirtyChai from 'dirty-chai';
 
 export const chaiSetup = {
-    configure() {
+    configure(): void {
         chai.config.includeStack = true;
         chai.use(ChaiBigNumber());
         chai.use(dirtyChai);
diff --git a/packages/contracts/util/crypto.ts b/packages/contracts/util/crypto.ts
index 810072d2f..3661b3afd 100644
--- a/packages/contracts/util/crypto.ts
+++ b/packages/contracts/util/crypto.ts
@@ -18,7 +18,7 @@ export const crypto = {
     solSHA256(args: any[]): Buffer {
         return crypto._solHash(args, ABI.soliditySHA256);
     },
-    _solHash(args: any[], hashFunction: (types: string[], values: any[]) => Buffer) {
+    _solHash(args: any[], hashFunction: (types: string[], values: any[]) => Buffer): Buffer {
         const argTypes: string[] = [];
         _.each(args, (arg, i) => {
             const isNumber = _.isFinite(arg);
diff --git a/packages/contracts/util/formatters.ts b/packages/contracts/util/formatters.ts
index 8e0dfb09e..3e3b67495 100644
--- a/packages/contracts/util/formatters.ts
+++ b/packages/contracts/util/formatters.ts
@@ -9,7 +9,7 @@ export const formatters = {
         signedOrders: SignedOrder[],
         shouldThrowOnInsufficientBalanceOrAllowance: boolean,
         fillTakerTokenAmounts: BigNumber[] = [],
-    ) {
+    ): BatchFillOrders {
         const batchFill: BatchFillOrders = {
             orderAddresses: [],
             orderValues: [],
@@ -48,7 +48,7 @@ export const formatters = {
         signedOrders: SignedOrder[],
         shouldThrowOnInsufficientBalanceOrAllowance: boolean,
         fillTakerTokenAmount: BigNumber,
-    ) {
+    ): FillOrdersUpTo {
         const fillUpTo: FillOrdersUpTo = {
             orderAddresses: [],
             orderValues: [],
@@ -80,7 +80,7 @@ export const formatters = {
         });
         return fillUpTo;
     },
-    createBatchCancel(signedOrders: SignedOrder[], cancelTakerTokenAmounts: BigNumber[] = []) {
+    createBatchCancel(signedOrders: SignedOrder[], cancelTakerTokenAmounts: BigNumber[] = []): BatchCancelOrders {
         const batchCancel: BatchCancelOrders = {
             orderAddresses: [],
             orderValues: [],
diff --git a/packages/contracts/util/multi_sig_wrapper.ts b/packages/contracts/util/multi_sig_wrapper.ts
index 9f6dcec52..c66106b9a 100644
--- a/packages/contracts/util/multi_sig_wrapper.ts
+++ b/packages/contracts/util/multi_sig_wrapper.ts
@@ -11,7 +11,7 @@ import { TransactionDataParams } from './types';
 
 export class MultiSigWrapper {
     private _multiSig: MultiSigWalletContract;
-    public static encodeFnArgs(name: string, abi: AbiDefinition[], args: any[]) {
+    public static encodeFnArgs(name: string, abi: AbiDefinition[], args: any[]): string {
         const abiEntity = _.find(abi, { name }) as MethodAbi;
         if (_.isUndefined(abiEntity)) {
             throw new Error(`Did not find abi entry for name: ${name}`);
@@ -33,7 +33,7 @@ export class MultiSigWrapper {
         from: string,
         dataParams: TransactionDataParams,
         value: BigNumber = new BigNumber(0),
-    ) {
+    ): Promise<string> {
         const { name, abi, args = [] } = dataParams;
         const encoded = MultiSigWrapper.encodeFnArgs(name, abi, args);
         return this._multiSig.submitTransaction.sendTransactionAsync(destination, value, encoded, {
diff --git a/packages/contracts/util/signed_order_utils.ts b/packages/contracts/util/signed_order_utils.ts
index fc2f800cd..30a2814e7 100644
--- a/packages/contracts/util/signed_order_utils.ts
+++ b/packages/contracts/util/signed_order_utils.ts
@@ -6,6 +6,15 @@ import * as _ from 'lodash';
 
 import { crypto } from './crypto';
 
+interface OrderAddressesAndValues {
+    orderAddresses: string[];
+    orderValues: BigNumber[];
+}
+
+interface OrderCancel extends OrderAddressesAndValues {
+    cancelTakerTokenAmount: BigNumber;
+}
+
 export const signedOrderUtils = {
     createFill: (
         signedOrder: SignedOrder,
@@ -20,14 +29,14 @@ export const signedOrderUtils = {
         };
         return fill;
     },
-    createCancel(signedOrder: SignedOrder, cancelTakerTokenAmount?: BigNumber) {
+    createCancel(signedOrder: SignedOrder, cancelTakerTokenAmount?: BigNumber): OrderCancel {
         const cancel = {
             ...signedOrderUtils.getOrderAddressesAndValues(signedOrder),
             cancelTakerTokenAmount: cancelTakerTokenAmount || signedOrder.takerTokenAmount,
         };
         return cancel;
     },
-    getOrderAddressesAndValues(signedOrder: SignedOrder) {
+    getOrderAddressesAndValues(signedOrder: SignedOrder): OrderAddressesAndValues {
         return {
             orderAddresses: [
                 signedOrder.maker,
diff --git a/packages/contracts/util/token_registry_wrapper.ts b/packages/contracts/util/token_registry_wrapper.ts
index d78c8a64e..bed62fa53 100644
--- a/packages/contracts/util/token_registry_wrapper.ts
+++ b/packages/contracts/util/token_registry_wrapper.ts
@@ -9,7 +9,7 @@ export class TokenRegWrapper {
     constructor(tokenRegContract: TokenRegistryContract) {
         this._tokenReg = tokenRegContract;
     }
-    public async addTokenAsync(token: Token, from: string) {
+    public async addTokenAsync(token: Token, from: string): Promise<string> {
         const tx = this._tokenReg.addToken.sendTransactionAsync(
             token.address as string,
             token.name,
@@ -21,7 +21,7 @@ export class TokenRegWrapper {
         );
         return tx;
     }
-    public async getTokenMetaDataAsync(tokenAddress: string) {
+    public async getTokenMetaDataAsync(tokenAddress: string): Promise<Token> {
         const data = await this._tokenReg.getTokenMetaData.callAsync(tokenAddress);
         const token: Token = {
             address: data[0],
@@ -33,7 +33,7 @@ export class TokenRegWrapper {
         };
         return token;
     }
-    public async getTokenByNameAsync(tokenName: string) {
+    public async getTokenByNameAsync(tokenName: string): Promise<Token> {
         const data = await this._tokenReg.getTokenByName.callAsync(tokenName);
         const token: Token = {
             address: data[0],
@@ -45,7 +45,7 @@ export class TokenRegWrapper {
         };
         return token;
     }
-    public async getTokenBySymbolAsync(tokenSymbol: string) {
+    public async getTokenBySymbolAsync(tokenSymbol: string): Promise<Token> {
         const data = await this._tokenReg.getTokenBySymbol.callAsync(tokenSymbol);
         const token: Token = {
             address: data[0],
diff --git a/packages/fill-scenarios/src/index.ts b/packages/fill-scenarios/src/index.ts
index 9f1b68ef2..7e5c6cc08 100644
--- a/packages/fill-scenarios/src/index.ts
+++ b/packages/fill-scenarios/src/index.ts
@@ -33,7 +33,7 @@ export class FillScenarios {
         this._zrxTokenAddress = zrxTokenAddress;
         this._exchangeContractAddress = exchangeContractAddress;
     }
-    public async initTokenBalancesAsync() {
+    public async initTokenBalancesAsync(): Promise<void> {
         for (const token of this._tokens) {
             if (token.symbol !== 'ZRX' && token.symbol !== 'WETH') {
                 const dummyToken = new DummyTokenContract(
@@ -126,7 +126,7 @@ export class FillScenarios {
         takerAddress: string,
         fillableAmount: BigNumber,
         partialFillAmount: BigNumber,
-    ) {
+    ): Promise<SignedOrder> {
         const [makerAddress] = this._userAddresses;
         const signedOrder = await this.createAsymmetricFillableSignedOrderAsync(
             makerTokenAddress,
diff --git a/packages/json-schemas/src/schema_validator.ts b/packages/json-schemas/src/schema_validator.ts
index 38ae766e6..f0392d1d1 100644
--- a/packages/json-schemas/src/schema_validator.ts
+++ b/packages/json-schemas/src/schema_validator.ts
@@ -23,7 +23,7 @@ export class SchemaValidator {
      * instances of that schema.
      * @param schema The schema to add
      */
-    public addSchema(schema: Schema) {
+    public addSchema(schema: Schema): void {
         this._validator.addSchema(schema, schema.id);
     }
     // In order to validate a complex JS object using jsonschema, we must replace any complex
diff --git a/packages/metacoin/test/utils/chai_setup.ts b/packages/metacoin/test/utils/chai_setup.ts
index 078edd309..1a8733093 100644
--- a/packages/metacoin/test/utils/chai_setup.ts
+++ b/packages/metacoin/test/utils/chai_setup.ts
@@ -4,7 +4,7 @@ import ChaiBigNumber = require('chai-bignumber');
 import * as dirtyChai from 'dirty-chai';
 
 export const chaiSetup = {
-    configure() {
+    configure(): void {
         chai.config.includeStack = true;
         chai.use(ChaiBigNumber());
         chai.use(dirtyChai);
diff --git a/packages/order-utils/src/order_hash.ts b/packages/order-utils/src/order_hash.ts
index 8da11c596..1cde72a73 100644
--- a/packages/order-utils/src/order_hash.ts
+++ b/packages/order-utils/src/order_hash.ts
@@ -16,7 +16,7 @@ const INVALID_TAKER_FORMAT = 'instance.taker is not of a type(s) string';
  * expects values of Solidity type `uint` to be passed as type `BN`.
  * We do not use BN anywhere else in the codebase.
  */
-function bigNumberToBN(value: BigNumber) {
+function bigNumberToBN(value: BigNumber): BN {
     return new BN(value.toString(), 10);
 }
 
diff --git a/packages/order-utils/test/signature_utils_test.ts b/packages/order-utils/test/signature_utils_test.ts
index ede681619..553ec2e53 100644
--- a/packages/order-utils/test/signature_utils_test.ts
+++ b/packages/order-utils/test/signature_utils_test.ts
@@ -106,7 +106,7 @@ describe('Signature utils', () => {
             };
 
             const fakeProvider = {
-                async sendAsync(payload: JSONRPCRequestPayload, callback: JSONRPCErrorCallback) {
+                async sendAsync(payload: JSONRPCRequestPayload, callback: JSONRPCErrorCallback): Promise<void> {
                     if (payload.method === 'eth_sign') {
                         const [address, message] = payload.params;
                         const signature = await web3Wrapper.signMessageAsync(address, message);
@@ -137,7 +137,7 @@ describe('Signature utils', () => {
                 s: '0x7feabdfe76e05924b484789f79af4ee7fa29ec006cedce1bbf369320d034e10b',
             };
             const fakeProvider = {
-                async sendAsync(payload: JSONRPCRequestPayload, callback: JSONRPCErrorCallback) {
+                async sendAsync(payload: JSONRPCRequestPayload, callback: JSONRPCErrorCallback): Promise<void> {
                     if (payload.method === 'eth_sign') {
                         const [address, message] = payload.params;
                         const signature = await web3Wrapper.signMessageAsync(address, message);
diff --git a/packages/order-utils/test/utils/chai_setup.ts b/packages/order-utils/test/utils/chai_setup.ts
index 078edd309..1a8733093 100644
--- a/packages/order-utils/test/utils/chai_setup.ts
+++ b/packages/order-utils/test/utils/chai_setup.ts
@@ -4,7 +4,7 @@ import ChaiBigNumber = require('chai-bignumber');
 import * as dirtyChai from 'dirty-chai';
 
 export const chaiSetup = {
-    configure() {
+    configure(): void {
         chai.config.includeStack = true;
         chai.use(ChaiBigNumber());
         chai.use(dirtyChai);
diff --git a/packages/order-watcher/src/order_watcher/order_watcher.ts b/packages/order-watcher/src/order_watcher/order_watcher.ts
index 63f87b565..3c93d6293 100644
--- a/packages/order-watcher/src/order_watcher/order_watcher.ts
+++ b/packages/order-watcher/src/order_watcher/order_watcher.ts
@@ -377,7 +377,7 @@ export class OrderWatcher {
         }
         this._dependentOrderHashes[signedOrder.maker][zrxTokenAddress].add(orderHash);
     }
-    private _removeFromDependentOrderHashes(makerAddress: string, tokenAddress: string, orderHash: string) {
+    private _removeFromDependentOrderHashes(makerAddress: string, tokenAddress: string, orderHash: string): void {
         this._dependentOrderHashes[makerAddress][tokenAddress].delete(orderHash);
         if (this._dependentOrderHashes[makerAddress][tokenAddress].size === 0) {
             delete this._dependentOrderHashes[makerAddress][tokenAddress];
diff --git a/packages/react-docs-example/ts/docs.tsx b/packages/react-docs-example/ts/docs.tsx
index eef331813..b35e9a629 100644
--- a/packages/react-docs-example/ts/docs.tsx
+++ b/packages/react-docs-example/ts/docs.tsx
@@ -94,7 +94,7 @@ export class Docs extends React.Component<DocsProps, DocsState> {
             docAgnosticFormat: docsInfo.convertToDocAgnosticFormat(v2TypeDocJson),
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const menuSubsectionsBySection = _.isUndefined(this.state.docAgnosticFormat)
             ? {}
             : docsInfo.getMenuSubsectionsBySection(this.state.docAgnosticFormat);
@@ -109,14 +109,14 @@ export class Docs extends React.Component<DocsProps, DocsState> {
             />
         );
     }
-    private _onVersionSelected(semver: string) {
+    private _onVersionSelected(semver: string): void {
         const selectedDocJSON = versionToDocJSON[semver];
         this.setState({
             selectedVersion: semver,
             docAgnosticFormat: docsInfo.convertToDocAgnosticFormat(selectedDocJSON as TypeDocNode),
         });
     }
-    private _getSourceUrl() {
+    private _getSourceUrl(): string {
         const sourceUrl = `${docsInfoConfig.packageUrl}/blob/@0xproject/web3-wrapper@${
             this.state.selectedVersion
         }/packages`;
diff --git a/packages/react-docs/src/components/badge.tsx b/packages/react-docs/src/components/badge.tsx
index b342f2dca..0137b153b 100644
--- a/packages/react-docs/src/components/badge.tsx
+++ b/packages/react-docs/src/components/badge.tsx
@@ -31,7 +31,7 @@ export class Badge extends React.Component<BadgeProps, BadgeState> {
             isHovering: false,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const badgeStyle = {
             ...styles.badge,
             backgroundColor: this.props.backgroundColor,
@@ -48,7 +48,7 @@ export class Badge extends React.Component<BadgeProps, BadgeState> {
             </div>
         );
     }
-    private _setHoverState(isHovering: boolean) {
+    private _setHoverState(isHovering: boolean): void {
         this.setState({
             isHovering,
         });
diff --git a/packages/react-docs/src/components/custom_enum.tsx b/packages/react-docs/src/components/custom_enum.tsx
index 1fe55eedc..797372f35 100644
--- a/packages/react-docs/src/components/custom_enum.tsx
+++ b/packages/react-docs/src/components/custom_enum.tsx
@@ -14,7 +14,7 @@ export interface CustomEnumProps {
 // This component renders custom string enums that was a work-around for versions of
 // TypeScript <2.4.0 that did not support them natively. We keep it around to support
 // older versions of 0x.js <0.9.0
-export function CustomEnum(props: CustomEnumProps) {
+export const CustomEnum = (props: CustomEnumProps) => {
     const type = props.type;
     if (!_.startsWith(type.defaultValue, STRING_ENUM_CODE_PREFIX)) {
         logUtils.log('We do not yet support `Variable` types that are not strEnums');
@@ -31,4 +31,4 @@ export function CustomEnum(props: CustomEnumProps) {
             {`}`}
         </span>
     );
-}
+};
diff --git a/packages/react-docs/src/components/documentation.tsx b/packages/react-docs/src/components/documentation.tsx
index 0a525f702..25687db67 100644
--- a/packages/react-docs/src/components/documentation.tsx
+++ b/packages/react-docs/src/components/documentation.tsx
@@ -71,19 +71,19 @@ export class Documentation extends React.Component<DocumentationProps, Documenta
             isHoveringSidebar: false,
         };
     }
-    public componentDidMount() {
+    public componentDidMount(): void {
         window.addEventListener('hashchange', this._onHashChanged.bind(this), false);
     }
-    public componentWillUnmount() {
+    public componentWillUnmount(): void {
         window.removeEventListener('hashchange', this._onHashChanged.bind(this), false);
     }
-    public componentDidUpdate(prevProps: DocumentationProps, prevState: DocumentationState) {
+    public componentDidUpdate(prevProps: DocumentationProps, prevState: DocumentationState): void {
         if (!_.isEqual(prevProps.docAgnosticFormat, this.props.docAgnosticFormat)) {
             const hash = window.location.hash.slice(1);
             sharedUtils.scrollToHash(hash, sharedConstants.SCROLL_CONTAINER_ID);
         }
     }
-    public render() {
+    public render(): React.ReactNode {
         const styles: Styles = {
             mainContainers: {
                 position: 'absolute',
@@ -157,7 +157,7 @@ export class Documentation extends React.Component<DocumentationProps, Documenta
             </div>
         );
     }
-    private _renderLoading(mainContainersStyles: React.CSSProperties) {
+    private _renderLoading(mainContainersStyles: React.CSSProperties): React.ReactNode {
         return (
             <div className="col col-12" style={mainContainersStyles}>
                 <div
@@ -289,7 +289,7 @@ export class Documentation extends React.Component<DocumentationProps, Documenta
             </div>
         );
     }
-    private _renderNetworkBadgesIfExists(sectionName: string) {
+    private _renderNetworkBadgesIfExists(sectionName: string): React.ReactNode {
         if (this.props.docsInfo.type !== SupportedDocJson.Doxity) {
             return null;
         }
@@ -368,17 +368,17 @@ export class Documentation extends React.Component<DocumentationProps, Documenta
             />
         );
     }
-    private _onSidebarHover(event: React.FormEvent<HTMLInputElement>) {
+    private _onSidebarHover(event: React.FormEvent<HTMLInputElement>): void {
         this.setState({
             isHoveringSidebar: true,
         });
     }
-    private _onSidebarHoverOff() {
+    private _onSidebarHoverOff(): void {
         this.setState({
             isHoveringSidebar: false,
         });
     }
-    private _onHashChanged(event: any) {
+    private _onHashChanged(event: any): void {
         const hash = window.location.hash.slice(1);
         sharedUtils.scrollToHash(hash, sharedConstants.SCROLL_CONTAINER_ID);
     }
diff --git a/packages/react-docs/src/components/enum.tsx b/packages/react-docs/src/components/enum.tsx
index 37f82f26e..536385d90 100644
--- a/packages/react-docs/src/components/enum.tsx
+++ b/packages/react-docs/src/components/enum.tsx
@@ -7,7 +7,7 @@ export interface EnumProps {
     values: EnumValue[];
 }
 
-export function Enum(props: EnumProps) {
+export const Enum = (props: EnumProps) => {
     const values = _.map(props.values, (value, i) => {
         const defaultValueIfAny = !_.isUndefined(value.defaultValue) ? ` = ${value.defaultValue}` : '';
         return `\n\t${value.name}${defaultValueIfAny},`;
@@ -20,4 +20,4 @@ export function Enum(props: EnumProps) {
             {`}`}
         </span>
     );
-}
+};
diff --git a/packages/react-docs/src/components/event_definition.tsx b/packages/react-docs/src/components/event_definition.tsx
index 67729ac87..b4dc729a9 100644
--- a/packages/react-docs/src/components/event_definition.tsx
+++ b/packages/react-docs/src/components/event_definition.tsx
@@ -24,7 +24,7 @@ export class EventDefinition extends React.Component<EventDefinitionProps, Event
             shouldShowAnchor: false,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const event = this.props.event;
         const id = `${this.props.sectionName}-${event.name}`;
         return (
@@ -49,7 +49,7 @@ export class EventDefinition extends React.Component<EventDefinitionProps, Event
             </div>
         );
     }
-    private _renderEventCode() {
+    private _renderEventCode(): React.ReactNode {
         const indexed = <span style={{ color: colors.green }}> indexed</span>;
         const eventArgs = _.map(this.props.event.eventArgs, (eventArg: EventArg) => {
             const type = (
@@ -76,7 +76,7 @@ export class EventDefinition extends React.Component<EventDefinitionProps, Event
             </span>
         );
     }
-    private _setAnchorVisibility(shouldShowAnchor: boolean) {
+    private _setAnchorVisibility(shouldShowAnchor: boolean): void {
         this.setState({
             shouldShowAnchor,
         });
diff --git a/packages/react-docs/src/components/interface.tsx b/packages/react-docs/src/components/interface.tsx
index bdfdf47c4..a881c7fec 100644
--- a/packages/react-docs/src/components/interface.tsx
+++ b/packages/react-docs/src/components/interface.tsx
@@ -13,7 +13,7 @@ export interface InterfaceProps {
     docsInfo: DocsInfo;
 }
 
-export function Interface(props: InterfaceProps) {
+export const Interface = (props: InterfaceProps) => {
     const type = props.type;
     const properties = _.map(type.children, property => {
         return (
@@ -63,4 +63,4 @@ export function Interface(props: InterfaceProps) {
             {`}`}
         </span>
     );
-}
+};
diff --git a/packages/react-docs/src/components/signature.tsx b/packages/react-docs/src/components/signature.tsx
index 1d3c90261..c4a6394fa 100644
--- a/packages/react-docs/src/components/signature.tsx
+++ b/packages/react-docs/src/components/signature.tsx
@@ -88,7 +88,7 @@ function renderParameters(
     docsInfo: DocsInfo,
     sectionName: string,
     typeDefinitionByName?: TypeDefinitionByName,
-) {
+): React.ReactNode[] {
     const params = _.map(parameters, (p: Parameter) => {
         const isOptional = p.isOptional;
         const hasDefaultValue = !_.isUndefined(p.defaultValue);
@@ -116,7 +116,7 @@ function renderTypeParameter(
     docsInfo: DocsInfo,
     sectionName: string,
     typeDefinitionByName?: TypeDefinitionByName,
-) {
+): React.ReactNode {
     const typeParam = (
         <span>
             {`<${typeParameter.name} extends `}
diff --git a/packages/react-docs/src/components/signature_block.tsx b/packages/react-docs/src/components/signature_block.tsx
index 6475d3995..9e5198e16 100644
--- a/packages/react-docs/src/components/signature_block.tsx
+++ b/packages/react-docs/src/components/signature_block.tsx
@@ -42,7 +42,7 @@ export class SignatureBlock extends React.Component<SignatureBlockProps, Signatu
             shouldShowAnchor: false,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const method = this.props.method;
         if (typeDocUtils.isPrivateOrProtectedProperty(method.name)) {
             return null;
@@ -111,14 +111,14 @@ export class SignatureBlock extends React.Component<SignatureBlockProps, Signatu
             </div>
         );
     }
-    private _renderChip(text: string) {
+    private _renderChip(text: string): React.ReactNode {
         return (
             <div className="p1 mr1" style={styles.chip}>
                 {text}
             </div>
         );
     }
-    private _renderParameterDescriptions(parameters: Parameter[]) {
+    private _renderParameterDescriptions(parameters: Parameter[]): React.ReactNode {
         const descriptions = _.map(parameters, parameter => {
             const isOptional = parameter.isOptional;
             return (
@@ -146,7 +146,7 @@ export class SignatureBlock extends React.Component<SignatureBlockProps, Signatu
         });
         return descriptions;
     }
-    private _setAnchorVisibility(shouldShowAnchor: boolean) {
+    private _setAnchorVisibility(shouldShowAnchor: boolean): void {
         this.setState({
             shouldShowAnchor,
         });
diff --git a/packages/react-docs/src/components/source_link.tsx b/packages/react-docs/src/components/source_link.tsx
index 89956a507..58a9ba6a7 100644
--- a/packages/react-docs/src/components/source_link.tsx
+++ b/packages/react-docs/src/components/source_link.tsx
@@ -10,7 +10,7 @@ export interface SourceLinkProps {
     version: string;
 }
 
-export function SourceLink(props: SourceLinkProps) {
+export const SourceLink = (props: SourceLinkProps) => {
     const src = props.source;
     const sourceCodeUrl = `${props.sourceUrl}/${src.fileName}#L${src.line}`;
     return (
@@ -20,4 +20,4 @@ export function SourceLink(props: SourceLinkProps) {
             </a>
         </div>
     );
-}
+};
diff --git a/packages/react-docs/src/components/type_definition.tsx b/packages/react-docs/src/components/type_definition.tsx
index 605b58fbd..a8e601ac2 100644
--- a/packages/react-docs/src/components/type_definition.tsx
+++ b/packages/react-docs/src/components/type_definition.tsx
@@ -3,7 +3,7 @@ import * as _ from 'lodash';
 import * as React from 'react';
 
 import { DocsInfo } from '../docs_info';
-import { CustomType, CustomTypeChild, KindString, TypeDocTypes } from '../types';
+import { CustomType, CustomTypeChild, EnumValue, KindString, TypeDocTypes } from '../types';
 import { constants } from '../utils/constants';
 import { utils } from '../utils/utils';
 
@@ -35,7 +35,7 @@ export class TypeDefinition extends React.Component<TypeDefinitionProps, TypeDef
             shouldShowAnchor: false,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const customType = this.props.customType;
         if (!this.props.docsInfo.isPublicType(customType.name)) {
             return null; // no-op
@@ -129,7 +129,7 @@ export class TypeDefinition extends React.Component<TypeDefinitionProps, TypeDef
             </div>
         );
     }
-    private _setAnchorVisibility(shouldShowAnchor: boolean) {
+    private _setAnchorVisibility(shouldShowAnchor: boolean): void {
         this.setState({
             shouldShowAnchor,
         });
@@ -150,7 +150,7 @@ export class TypeDefinition extends React.Component<TypeDefinitionProps, TypeDef
      *
      * Each property description should be on a new line.
      */
-    private _formatComment(text: string) {
+    private _formatComment(text: string): string {
         const NEW_LINE_REGEX = /(\r\n|\n|\r)/gm;
         const sanitizedText = text.replace(NEW_LINE_REGEX, ' ');
         const PROPERTY_DESCRIPTION_DIVIDER = ':';
diff --git a/packages/react-docs/src/docs_info.ts b/packages/react-docs/src/docs_info.ts
index 0030568a1..e9c84b7c9 100644
--- a/packages/react-docs/src/docs_info.ts
+++ b/packages/react-docs/src/docs_info.ts
@@ -11,6 +11,7 @@ import {
     DoxityDocObj,
     SectionsMap,
     SupportedDocJson,
+    TypeDefinitionByName,
     TypeDocNode,
 } from './types';
 import { doxityUtils } from './utils/doxity_utils';
@@ -104,13 +105,13 @@ export class DocsInfo {
         });
         return menuSubsectionsBySection;
     }
-    public getTypeDefinitionsByName(docAgnosticFormat: DocAgnosticFormat) {
+    public getTypeDefinitionsByName(docAgnosticFormat: DocAgnosticFormat): { [name: string]: TypeDefinitionByName } {
         if (_.isUndefined(this.sections.types)) {
             return {};
         }
 
         const typeDocSection = docAgnosticFormat[this.sections.types];
-        const typeDefinitionByName = _.keyBy(typeDocSection.types, 'name');
+        const typeDefinitionByName = _.keyBy(typeDocSection.types, 'name') as any;
         return typeDefinitionByName;
     }
     public isVisibleConstructor(sectionName: string): boolean {
diff --git a/packages/react-docs/src/utils/doxity_utils.ts b/packages/react-docs/src/utils/doxity_utils.ts
index 1b91690e0..374ee07dd 100644
--- a/packages/react-docs/src/utils/doxity_utils.ts
+++ b/packages/react-docs/src/utils/doxity_utils.ts
@@ -142,7 +142,7 @@ export const doxityUtils = {
         };
         return type;
     },
-    _isMethod(abiDoc: DoxityAbiDoc) {
+    _isMethod(abiDoc: DoxityAbiDoc): boolean {
         if (abiDoc.type !== AbiTypes.Function) {
             return false;
         }
@@ -152,7 +152,7 @@ export const doxityUtils = {
         const isMethod = hasNamedOutputIfExists && !isNameAllCaps;
         return isMethod;
     },
-    _isProperty(abiDoc: DoxityAbiDoc) {
+    _isProperty(abiDoc: DoxityAbiDoc): boolean {
         if (abiDoc.type !== AbiTypes.Function) {
             return false;
         }
diff --git a/packages/react-docs/src/utils/typedoc_utils.ts b/packages/react-docs/src/utils/typedoc_utils.ts
index 0c7803a04..5a672f10f 100644
--- a/packages/react-docs/src/utils/typedoc_utils.ts
+++ b/packages/react-docs/src/utils/typedoc_utils.ts
@@ -113,7 +113,7 @@ export const typeDocUtils = {
         });
         return docAgnosticFormat;
     },
-    _convertEntitiesToDocSection(entities: TypeDocNode[], docsInfo: DocsInfo, sectionName: string) {
+    _convertEntitiesToDocSection(entities: TypeDocNode[], docsInfo: DocsInfo, sectionName: string): DocSection {
         const docSection: DocSection = {
             comment: '',
             constructors: [],
diff --git a/packages/react-docs/src/utils/utils.ts b/packages/react-docs/src/utils/utils.ts
index f8c1fefff..e3dd1fc62 100644
--- a/packages/react-docs/src/utils/utils.ts
+++ b/packages/react-docs/src/utils/utils.ts
@@ -1,5 +1,5 @@
 export const utils = {
-    spawnSwitchErr(name: string, value: any) {
+    spawnSwitchErr(name: string, value: any): Error {
         return new Error(`Unexpected switch value: ${value} encountered for ${name}`);
     },
 };
diff --git a/packages/react-shared/src/components/anchor_title.tsx b/packages/react-shared/src/components/anchor_title.tsx
index f44354097..89fde23cf 100644
--- a/packages/react-shared/src/components/anchor_title.tsx
+++ b/packages/react-shared/src/components/anchor_title.tsx
@@ -52,7 +52,7 @@ export class AnchorTitle extends React.Component<AnchorTitleProps, AnchorTitleSt
             isHovering: false,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         let opacity = 0;
         if (this.props.shouldShowAnchor) {
             opacity = this.state.isHovering ? 0.6 : 1;
@@ -79,7 +79,7 @@ export class AnchorTitle extends React.Component<AnchorTitleProps, AnchorTitleSt
             </div>
         );
     }
-    private _setHoverState(isHovering: boolean) {
+    private _setHoverState(isHovering: boolean): void {
         this.setState({
             isHovering,
         });
diff --git a/packages/react-shared/src/components/markdown_code_block.tsx b/packages/react-shared/src/components/markdown_code_block.tsx
index 2070bb8e1..49b2ff526 100644
--- a/packages/react-shared/src/components/markdown_code_block.tsx
+++ b/packages/react-shared/src/components/markdown_code_block.tsx
@@ -12,10 +12,10 @@ export interface MarkdownCodeBlockState {}
 export class MarkdownCodeBlock extends React.Component<MarkdownCodeBlockProps, MarkdownCodeBlockState> {
     // Re-rendering a codeblock causes any use selection to become de-selected. This is annoying when trying
     // to copy-paste code examples. We therefore noop re-renders on this component if it's props haven't changed.
-    public shouldComponentUpdate(nextProps: MarkdownCodeBlockProps, nextState: MarkdownCodeBlockState) {
+    public shouldComponentUpdate(nextProps: MarkdownCodeBlockProps, nextState: MarkdownCodeBlockState): boolean {
         return nextProps.value !== this.props.value || nextProps.language !== this.props.language;
     }
-    public render() {
+    public render(): React.ReactNode {
         return (
             <span style={{ fontSize: 14 }}>
                 <HighLight className={this.props.language || 'javascript'}>{this.props.value}</HighLight>
diff --git a/packages/react-shared/src/components/markdown_link_block.tsx b/packages/react-shared/src/components/markdown_link_block.tsx
index 8f5862249..0b489b749 100644
--- a/packages/react-shared/src/components/markdown_link_block.tsx
+++ b/packages/react-shared/src/components/markdown_link_block.tsx
@@ -13,10 +13,10 @@ export interface MarkdownLinkBlockState {}
 export class MarkdownLinkBlock extends React.Component<MarkdownLinkBlockProps, MarkdownLinkBlockState> {
     // Re-rendering a linkBlock causes it to remain unclickable.
     // We therefore noop re-renders on this component if it's props haven't changed.
-    public shouldComponentUpdate(nextProps: MarkdownLinkBlockProps, nextState: MarkdownLinkBlockState) {
+    public shouldComponentUpdate(nextProps: MarkdownLinkBlockProps, nextState: MarkdownLinkBlockState): boolean {
         return nextProps.href !== this.props.href;
     }
-    public render() {
+    public render(): React.ReactNode {
         const href = this.props.href;
         const isLinkToSection = _.startsWith(href, '#');
         // If protocol is http or https, we can open in a new tab, otherwise don't for security reasons
@@ -39,7 +39,7 @@ export class MarkdownLinkBlock extends React.Component<MarkdownLinkBlockProps, M
             return <a href={href}>{this.props.children}</a>;
         }
     }
-    private _onHashUrlClick(href: string) {
+    private _onHashUrlClick(href: string): void {
         const hash = href.split('#')[1];
         utils.scrollToHash(hash, constants.SCROLL_CONTAINER_ID);
         utils.setUrlHash(hash);
diff --git a/packages/react-shared/src/components/markdown_section.tsx b/packages/react-shared/src/components/markdown_section.tsx
index 449e8a045..b0761cd21 100644
--- a/packages/react-shared/src/components/markdown_section.tsx
+++ b/packages/react-shared/src/components/markdown_section.tsx
@@ -39,7 +39,7 @@ export class MarkdownSection extends React.Component<MarkdownSectionProps, Markd
             shouldShowAnchor: false,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const { sectionName, markdownContent, headerSize, githubLink } = this.props as PropsWithDefaults;
 
         const id = utils.getIdFromName(sectionName);
@@ -87,7 +87,7 @@ export class MarkdownSection extends React.Component<MarkdownSectionProps, Markd
             </div>
         );
     }
-    private _setAnchorVisibility(shouldShowAnchor: boolean) {
+    private _setAnchorVisibility(shouldShowAnchor: boolean): void {
         this.setState({
             shouldShowAnchor,
         });
diff --git a/packages/react-shared/src/components/nested_sidebar_menu.tsx b/packages/react-shared/src/components/nested_sidebar_menu.tsx
index f49d6fcf7..804398d71 100644
--- a/packages/react-shared/src/components/nested_sidebar_menu.tsx
+++ b/packages/react-shared/src/components/nested_sidebar_menu.tsx
@@ -43,7 +43,7 @@ export class NestedSidebarMenu extends React.Component<NestedSidebarMenuProps, N
         shouldDisplaySectionHeaders: true,
         onMenuItemClick: _.noop,
     };
-    public render() {
+    public render(): React.ReactNode {
         const navigation = _.map(this.props.topLevelMenu, (menuItems: string[], sectionName: string) => {
             const finalSectionName = utils.convertDashesToSpaces(sectionName);
             if (this.props.shouldDisplaySectionHeaders) {
diff --git a/packages/react-shared/src/components/section_header.tsx b/packages/react-shared/src/components/section_header.tsx
index 0224c2127..9bbec7747 100644
--- a/packages/react-shared/src/components/section_header.tsx
+++ b/packages/react-shared/src/components/section_header.tsx
@@ -32,7 +32,7 @@ export class SectionHeader extends React.Component<SectionHeaderProps, SectionHe
             shouldShowAnchor: false,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const { sectionName, headerSize } = this.props as PropsWithDefaults;
 
         const finalSectionName = utils.convertDashesToSpaces(this.props.sectionName);
@@ -65,7 +65,7 @@ export class SectionHeader extends React.Component<SectionHeaderProps, SectionHe
             </div>
         );
     }
-    private _setAnchorVisibility(shouldShowAnchor: boolean) {
+    private _setAnchorVisibility(shouldShowAnchor: boolean): void {
         this.setState({
             shouldShowAnchor,
         });
diff --git a/packages/react-shared/src/components/version_drop_down.tsx b/packages/react-shared/src/components/version_drop_down.tsx
index d9e49b205..926dd6a7a 100644
--- a/packages/react-shared/src/components/version_drop_down.tsx
+++ b/packages/react-shared/src/components/version_drop_down.tsx
@@ -14,7 +14,7 @@ export interface VersionDropDownProps {
 export interface VersionDropDownState {}
 
 export class VersionDropDown extends React.Component<VersionDropDownProps, VersionDropDownState> {
-    public render() {
+    public render(): React.ReactNode {
         return (
             <div className="mx-auto" style={{ width: 120 }}>
                 <DropDownMenu
@@ -27,13 +27,13 @@ export class VersionDropDown extends React.Component<VersionDropDownProps, Versi
             </div>
         );
     }
-    private _renderDropDownItems() {
+    private _renderDropDownItems(): React.ReactNode[] {
         const items = _.map(this.props.versions, version => {
             return <MenuItem key={version} value={version} primaryText={`v${version}`} />;
         });
         return items;
     }
-    private _updateSelectedVersion(e: any, index: number, semver: string) {
+    private _updateSelectedVersion(e: any, index: number, semver: string): void {
         this.props.onVersionSelected(semver);
     }
 }
diff --git a/packages/react-shared/src/utils/utils.ts b/packages/react-shared/src/utils/utils.ts
index 1538dd087..93c7e9f7b 100644
--- a/packages/react-shared/src/utils/utils.ts
+++ b/packages/react-shared/src/utils/utils.ts
@@ -7,7 +7,7 @@ import { EtherscanLinkSuffixes, Networks } from '../types';
 import { constants } from './constants';
 
 export const utils = {
-    setUrlHash(anchorId: string) {
+    setUrlHash(anchorId: string): void {
         window.location.hash = anchorId;
     },
     scrollToHash(hash: string, containerId: string): void {
@@ -26,11 +26,11 @@ export const utils = {
         const isUserOnMobile = isMobile();
         return isUserOnMobile;
     },
-    getIdFromName(name: string) {
+    getIdFromName(name: string): string {
         const id = name.replace(/ /g, '-');
         return id;
     },
-    convertDashesToSpaces(text: string) {
+    convertDashesToSpaces(text: string): string {
         return text.replace(/-/g, ' ');
     },
     getEtherScanLinkIfExists(
diff --git a/packages/sol-compiler/test/compiler_test.ts b/packages/sol-compiler/test/compiler_test.ts
index 79bb3b873..d0f121897 100644
--- a/packages/sol-compiler/test/compiler_test.ts
+++ b/packages/sol-compiler/test/compiler_test.ts
@@ -11,7 +11,7 @@ import { constants } from './util/constants';
 
 const expect = chai.expect;
 
-describe('#Compiler', function() {
+describe('#Compiler', function(): void {
     this.timeout(constants.timeoutMs);
     const artifactsDir = `${__dirname}/fixtures/artifacts`;
     const contractsDir = `${__dirname}/fixtures/contracts`;
diff --git a/packages/sol-cov/src/coverage_subprovider.ts b/packages/sol-cov/src/coverage_subprovider.ts
index b08291afb..08efeaa24 100644
--- a/packages/sol-cov/src/coverage_subprovider.ts
+++ b/packages/sol-cov/src/coverage_subprovider.ts
@@ -51,7 +51,7 @@ export class CoverageSubprovider extends Subprovider {
      * @param end Callback to call if subprovider handled the request and wants to pass back the request.
      */
     // tslint:disable-next-line:prefer-function-over-method async-suffix
-    public async handleRequest(payload: JSONRPCRequestPayload, next: NextCallback, end: ErrorCallback) {
+    public async handleRequest(payload: JSONRPCRequestPayload, next: NextCallback, end: ErrorCallback): Promise<void> {
         switch (payload.method) {
             case 'eth_sendTransaction':
                 const txData = payload.params[0];
diff --git a/packages/sra-report/src/postman_environment_factory.ts b/packages/sra-report/src/postman_environment_factory.ts
index 530cacb07..42389aea2 100644
--- a/packages/sra-report/src/postman_environment_factory.ts
+++ b/packages/sra-report/src/postman_environment_factory.ts
@@ -12,8 +12,22 @@ import { addresses as ropstenAddresses } from './contract_addresses/ropsten_addr
 
 const ENVIRONMENT_NAME = 'SRA Report';
 
-interface EnvironmentValue {
+export interface EnvironmentValue {
     key: string;
+    value: string;
+    enabled: true;
+    type: 'text';
+}
+
+export interface Environment {
+    name: string;
+    values: EnvironmentValue[];
+}
+
+export interface Addresses {
+    WETH: string;
+    ZRX: string;
+    EXCHANGE: string;
 }
 
 export const postmanEnvironmentFactory = {
@@ -25,7 +39,7 @@ export const postmanEnvironmentFactory = {
      *  - Contract addresses based on the network id for making specific queries (ex. baseTokenAddress=ZRX_address)
      *  - Order properties for making specific queries (ex. maker=orderMaker)
      */
-    async createPostmanEnvironmentAsync(url: string, networkId: number) {
+    async createPostmanEnvironmentAsync(url: string, networkId: number): Promise<Environment> {
         const orderEnvironmentValues = await createOrderEnvironmentValuesAsync(url);
         const allEnvironmentValues = _.concat(
             createSchemaEnvironmentValues(),
@@ -40,7 +54,7 @@ export const postmanEnvironmentFactory = {
         return environment;
     },
 };
-function createSchemaEnvironmentValues() {
+function createSchemaEnvironmentValues(): EnvironmentValue[] {
     const schemas: Schema[] = _.values(schemasByName);
     const schemaEnvironmentValues = _.compact(
         _.map(schemas, (schema: Schema) => {
@@ -60,7 +74,7 @@ function createSchemaEnvironmentValues() {
     const result = _.concat(schemaEnvironmentValues, createEnvironmentValue('schemaKeys', JSON.stringify(schemaKeys)));
     return result;
 }
-function createContractAddressEnvironmentValues(networkId: number) {
+function createContractAddressEnvironmentValues(networkId: number): EnvironmentValue[] {
     const contractAddresses = getContractAddresses(networkId);
     return [
         createEnvironmentValue('tokenContractAddress1', contractAddresses.WETH),
@@ -68,7 +82,7 @@ function createContractAddressEnvironmentValues(networkId: number) {
         createEnvironmentValue('exchangeContractAddress', contractAddresses.EXCHANGE),
     ];
 }
-async function createOrderEnvironmentValuesAsync(url: string) {
+async function createOrderEnvironmentValuesAsync(url: string): Promise<EnvironmentValue[]> {
     const httpClient = new HttpClient(url);
     const orders = await httpClient.getOrdersAsync();
     const orderIfExists = _.head(orders);
@@ -91,7 +105,7 @@ async function createOrderEnvironmentValuesAsync(url: string) {
         ];
     }
 }
-function getContractAddresses(networkId: number) {
+function getContractAddresses(networkId: number): Addresses {
     switch (networkId) {
         case 1:
             return mainnetAddresses;
@@ -105,7 +119,7 @@ function getContractAddresses(networkId: number) {
             throw new Error('Unsupported network id');
     }
 }
-function convertSchemaIdToKey(schemaId: string) {
+function convertSchemaIdToKey(schemaId: string): string {
     let result = schemaId;
     if (_.startsWith(result, '/')) {
         result = result.substr(1);
@@ -113,7 +127,8 @@ function convertSchemaIdToKey(schemaId: string) {
     result = `${result}Schema`;
     return result;
 }
-function createEnvironmentValue(key: string, value: string) {
+
+function createEnvironmentValue(key: string, value: string): EnvironmentValue {
     return {
         key,
         value,
diff --git a/packages/sra-report/test/test_runner.ts b/packages/sra-report/test/test_runner.ts
index bf9b923e7..91ef6aa4e 100644
--- a/packages/sra-report/test/test_runner.ts
+++ b/packages/sra-report/test/test_runner.ts
@@ -3,7 +3,12 @@ import * as chaiAsPromised from 'chai-as-promised';
 import * as dirtyChai from 'dirty-chai';
 import * as _ from 'lodash';
 import 'mocha';
-import { NewmanRunExecution, NewmanRunExecutionAssertion, NewmanRunSummary } from 'newman';
+import {
+    NewmanRunExecution,
+    NewmanRunExecutionAssertion,
+    NewmanRunExecutionAssertionError,
+    NewmanRunSummary,
+} from 'newman';
 import * as nock from 'nock';
 
 import * as sraReportCollectionJSON from '../../postman_collections/sra_report.postman_collection.json';
@@ -33,7 +38,7 @@ export const testRunner = {
         nockInterceptor: nock.Interceptor,
         postmanCollectionFolderName: string,
         postmanCollectionRequestName: string,
-    ) {
+    ): void {
         const newmanRunOptions = {
             ...baseNewmanRunOptions,
             folder: postmanCollectionFolderName,
@@ -87,7 +92,7 @@ export const testRunner = {
         postmanCollectionRequestName: string,
         malformedJson: object,
         correctJson: object,
-    ) {
+    ): void {
         const newmanRunOptions = {
             ...baseNewmanRunOptions,
             folder: postmanCollectionFolderName,
@@ -116,7 +121,7 @@ function findAssertionErrorIfExists(
     summary: NewmanRunSummary,
     postmanCollectionRequestName: string,
     postmanCollectionAssertionName: string,
-) {
+): NewmanRunExecutionAssertionError | undefined {
     const matchingExecutionIfExists = _.find(summary.run.executions, (execution: NewmanRunExecution) => {
         return execution.item.name === postmanCollectionRequestName;
     });
diff --git a/packages/subproviders/src/subproviders/base_wallet_subprovider.ts b/packages/subproviders/src/subproviders/base_wallet_subprovider.ts
index f68d7eb29..a04be68e1 100644
--- a/packages/subproviders/src/subproviders/base_wallet_subprovider.ts
+++ b/packages/subproviders/src/subproviders/base_wallet_subprovider.ts
@@ -8,13 +8,13 @@ import { Callback, ErrorCallback, PartialTxParams, ResponseWithTxParams, WalletS
 import { Subprovider } from './subprovider';
 
 export abstract class BaseWalletSubprovider extends Subprovider {
-    protected static _validateTxParams(txParams: PartialTxParams) {
+    protected static _validateTxParams(txParams: PartialTxParams): void {
         if (!_.isUndefined(txParams.to)) {
             assert.isETHAddressHex('to', txParams.to);
         }
         assert.isHexString('nonce', txParams.nonce);
     }
-    private static _validateSender(sender: string) {
+    private static _validateSender(sender: string): void {
         if (_.isUndefined(sender) || !addressUtils.isAddress(sender)) {
             throw new Error(WalletSubproviderErrors.SenderInvalidOrNotSupplied);
         }
@@ -33,7 +33,7 @@ export abstract class BaseWalletSubprovider extends Subprovider {
      * @param end Callback to call if subprovider handled the request and wants to pass back the request.
      */
     // tslint:disable-next-line:async-suffix
-    public async handleRequest(payload: JSONRPCRequestPayload, next: Callback, end: ErrorCallback) {
+    public async handleRequest(payload: JSONRPCRequestPayload, next: Callback, end: ErrorCallback): Promise<void> {
         let accounts;
         let txParams;
         switch (payload.method) {
diff --git a/packages/subproviders/src/subproviders/empty_wallet_subprovider.ts b/packages/subproviders/src/subproviders/empty_wallet_subprovider.ts
index 8f152dc0a..bd7a4b6d9 100644
--- a/packages/subproviders/src/subproviders/empty_wallet_subprovider.ts
+++ b/packages/subproviders/src/subproviders/empty_wallet_subprovider.ts
@@ -18,7 +18,7 @@ export class EmptyWalletSubprovider extends Subprovider {
      * @param end Callback to call if subprovider handled the request and wants to pass back the request.
      */
     // tslint:disable-next-line:prefer-function-over-method async-suffix
-    public async handleRequest(payload: JSONRPCRequestPayload, next: Callback, end: ErrorCallback) {
+    public async handleRequest(payload: JSONRPCRequestPayload, next: Callback, end: ErrorCallback): Promise<void> {
         switch (payload.method) {
             case 'eth_accounts':
                 end(null, []);
diff --git a/packages/subproviders/src/subproviders/fake_gas_estimate_subprovider.ts b/packages/subproviders/src/subproviders/fake_gas_estimate_subprovider.ts
index 54fd7bcb9..6c49f20cf 100644
--- a/packages/subproviders/src/subproviders/fake_gas_estimate_subprovider.ts
+++ b/packages/subproviders/src/subproviders/fake_gas_estimate_subprovider.ts
@@ -32,7 +32,7 @@ export class FakeGasEstimateSubprovider extends Subprovider {
      * @param end Callback to call if subprovider handled the request and wants to pass back the request.
      */
     // tslint:disable-next-line:prefer-function-over-method async-suffix
-    public async handleRequest(payload: JSONRPCRequestPayload, next: Callback, end: ErrorCallback) {
+    public async handleRequest(payload: JSONRPCRequestPayload, next: Callback, end: ErrorCallback): Promise<void> {
         switch (payload.method) {
             case 'eth_estimateGas':
                 end(null, this._constantGasAmount);
diff --git a/packages/subproviders/src/subproviders/ganache.ts b/packages/subproviders/src/subproviders/ganache.ts
index debd7ecf0..9ab764048 100644
--- a/packages/subproviders/src/subproviders/ganache.ts
+++ b/packages/subproviders/src/subproviders/ganache.ts
@@ -28,7 +28,7 @@ export class GanacheSubprovider extends Subprovider {
      * @param end Callback to call if subprovider handled the request and wants to pass back the request.
      */
     // tslint:disable-next-line:prefer-function-over-method async-suffix
-    public async handleRequest(payload: JSONRPCRequestPayload, next: Callback, end: ErrorCallback) {
+    public async handleRequest(payload: JSONRPCRequestPayload, next: Callback, end: ErrorCallback): Promise<void> {
         this._ganacheProvider.sendAsync(payload, (err: Error | null, result: any) => {
             end(err, result && result.result);
         });
diff --git a/packages/subproviders/src/subproviders/injected_web3.ts b/packages/subproviders/src/subproviders/injected_web3.ts
index 3ca0c4bd0..73b870cd5 100644
--- a/packages/subproviders/src/subproviders/injected_web3.ts
+++ b/packages/subproviders/src/subproviders/injected_web3.ts
@@ -31,7 +31,7 @@ export class InjectedWeb3Subprovider extends Subprovider {
      * @param end Callback to call if subprovider handled the request and wants to pass back the request.
      */
     // tslint:disable-next-line:prefer-function-over-method async-suffix
-    public async handleRequest(payload: JSONRPCRequestPayload, next: Callback, end: ErrorCallback) {
+    public async handleRequest(payload: JSONRPCRequestPayload, next: Callback, end: ErrorCallback): Promise<void> {
         switch (payload.method) {
             case 'web3_clientVersion':
                 this._injectedWeb3.version.getNode(end);
diff --git a/packages/subproviders/src/subproviders/ledger.ts b/packages/subproviders/src/subproviders/ledger.ts
index 563e5a56a..347eda55f 100644
--- a/packages/subproviders/src/subproviders/ledger.ts
+++ b/packages/subproviders/src/subproviders/ledger.ts
@@ -74,7 +74,7 @@ export class LedgerSubprovider extends BaseWalletSubprovider {
      * Set a desired derivation path when computing the available user addresses
      * @param basDerivationPath The desired derivation path (e.g `44'/60'/0'`)
      */
-    public setPath(basDerivationPath: string) {
+    public setPath(basDerivationPath: string): void {
         this._baseDerivationPath = basDerivationPath;
     }
     /**
@@ -192,7 +192,7 @@ export class LedgerSubprovider extends BaseWalletSubprovider {
         this._connectionLock.release();
         return ledgerEthereumClient;
     }
-    private async _destroyLedgerClientAsync() {
+    private async _destroyLedgerClientAsync(): Promise<void> {
         await this._connectionLock.acquire();
         if (_.isUndefined(this._ledgerClientIfExists)) {
             this._connectionLock.release();
diff --git a/packages/subproviders/src/subproviders/mnemonic_wallet.ts b/packages/subproviders/src/subproviders/mnemonic_wallet.ts
index 080bfeb4c..f29864a74 100644
--- a/packages/subproviders/src/subproviders/mnemonic_wallet.ts
+++ b/packages/subproviders/src/subproviders/mnemonic_wallet.ts
@@ -56,7 +56,7 @@ export class MnemonicWalletSubprovider extends BaseWalletSubprovider {
      * Set a desired derivation path when computing the available user addresses
      * @param baseDerivationPath The desired derivation path (e.g `44'/60'/0'`)
      */
-    public setPath(baseDerivationPath: string) {
+    public setPath(baseDerivationPath: string): void {
         this._baseDerivationPath = baseDerivationPath;
         this._derivedKeyInfo = this._initialDerivedKeyInfo(this._baseDerivationPath);
     }
diff --git a/packages/subproviders/src/subproviders/subprovider.ts b/packages/subproviders/src/subproviders/subprovider.ts
index 2118f52c8..56d2381a0 100644
--- a/packages/subproviders/src/subproviders/subprovider.ts
+++ b/packages/subproviders/src/subproviders/subprovider.ts
@@ -11,7 +11,7 @@ export abstract class Subprovider {
     // tslint:disable-next-line:underscore-private-and-protected
     private engine: any;
     // Ported from: https://github.com/MetaMask/provider-engine/blob/master/util/random-id.js
-    private static _getRandomId() {
+    private static _getRandomId(): number {
         const extraDigits = 3;
         // 13 time digits
         const datePart = new Date().getTime() * Math.pow(10, extraDigits);
diff --git a/packages/subproviders/test/chai_setup.ts b/packages/subproviders/test/chai_setup.ts
index a281bab6c..6c24dc222 100644
--- a/packages/subproviders/test/chai_setup.ts
+++ b/packages/subproviders/test/chai_setup.ts
@@ -3,7 +3,7 @@ import chaiAsPromised = require('chai-as-promised');
 import * as dirtyChai from 'dirty-chai';
 
 export const chaiSetup = {
-    configure() {
+    configure(): void {
         chai.config.includeStack = true;
         chai.use(dirtyChai);
         chai.use(chaiAsPromised);
diff --git a/packages/subproviders/test/unit/nonce_tracker_subprovider_test.ts b/packages/subproviders/test/unit/nonce_tracker_subprovider_test.ts
index 14176c145..1a3db7672 100644
--- a/packages/subproviders/test/unit/nonce_tracker_subprovider_test.ts
+++ b/packages/subproviders/test/unit/nonce_tracker_subprovider_test.ts
@@ -39,7 +39,7 @@ describe('NonceTrackerSubprovider', () => {
         '0x5e1d3a76fbf824220eafc8c79ad578ad2b67d01b0c2425eb1f1347e8f50882ab',
         '0x5bd428537f05f9830e93792f90ea6a3e2d1ee84952dd96edbae9f658f831ab13',
     ];
-    function createFixtureSubprovider() {
+    function createFixtureSubprovider(): FixtureSubprovider {
         let isFirstGetTransactionCount = true;
         const fixedBlockNumberAndTransactionCountProvider = new FixtureSubprovider({
             eth_getBlockByNumber: '0x01',
diff --git a/packages/testnet-faucets/package.json b/packages/testnet-faucets/package.json
index 198c0b2f7..48fe77bf4 100644
--- a/packages/testnet-faucets/package.json
+++ b/packages/testnet-faucets/package.json
@@ -17,6 +17,7 @@
     "dependencies": {
         "0x.js": "^0.37.2",
         "@0xproject/subproviders": "^0.10.1",
+        "@0xproject/types": "^0.6.3",
         "@0xproject/typescript-typings": "^0.3.1",
         "@0xproject/utils": "^0.6.1",
         "body-parser": "^1.17.1",
diff --git a/packages/testnet-faucets/src/ts/dispatch_queue.ts b/packages/testnet-faucets/src/ts/dispatch_queue.ts
index 2dbeeba7a..b1996a0c2 100644
--- a/packages/testnet-faucets/src/ts/dispatch_queue.ts
+++ b/packages/testnet-faucets/src/ts/dispatch_queue.ts
@@ -28,12 +28,12 @@ export class DispatchQueue {
     public isFull(): boolean {
         return this.size() >= MAX_QUEUE_SIZE;
     }
-    public stop() {
+    public stop(): void {
         if (!_.isUndefined(this._queueIntervalIdIfExists)) {
             intervalUtils.clearAsyncExcludingInterval(this._queueIntervalIdIfExists);
         }
     }
-    private _start() {
+    private _start(): void {
         this._queueIntervalIdIfExists = intervalUtils.setAsyncExcludingInterval(
             async () => {
                 const taskAsync = this._queue.shift();
diff --git a/packages/testnet-faucets/src/ts/dispense_asset_tasks.ts b/packages/testnet-faucets/src/ts/dispense_asset_tasks.ts
index 99f1bad36..39ba4bc14 100644
--- a/packages/testnet-faucets/src/ts/dispense_asset_tasks.ts
+++ b/packages/testnet-faucets/src/ts/dispense_asset_tasks.ts
@@ -11,8 +11,10 @@ const DISPENSE_AMOUNT_TOKEN = 0.1;
 const DISPENSE_MAX_AMOUNT_TOKEN = 2;
 const DISPENSE_MAX_AMOUNT_ETHER = 2;
 
+type AsyncTask = () => Promise<void>;
+
 export const dispenseAssetTasks = {
-    dispenseEtherTask(recipientAddress: string, web3: Web3) {
+    dispenseEtherTask(recipientAddress: string, web3: Web3): AsyncTask {
         return async () => {
             logUtils.log(`Processing ETH ${recipientAddress}`);
             const userBalance = await promisify<BigNumber>(web3.eth.getBalance)(recipientAddress);
@@ -32,7 +34,7 @@ export const dispenseAssetTasks = {
             logUtils.log(`Sent ${DISPENSE_AMOUNT_ETHER} ETH to ${recipientAddress} tx: ${txHash}`);
         };
     },
-    dispenseTokenTask(recipientAddress: string, tokenSymbol: string, zeroEx: ZeroEx) {
+    dispenseTokenTask(recipientAddress: string, tokenSymbol: string, zeroEx: ZeroEx): AsyncTask {
         return async () => {
             logUtils.log(`Processing ${tokenSymbol} ${recipientAddress}`);
             const amountToDispense = new BigNumber(DISPENSE_AMOUNT_TOKEN);
diff --git a/packages/testnet-faucets/src/ts/error_reporter.ts b/packages/testnet-faucets/src/ts/error_reporter.ts
index f0f3ca679..a0abcc07b 100644
--- a/packages/testnet-faucets/src/ts/error_reporter.ts
+++ b/packages/testnet-faucets/src/ts/error_reporter.ts
@@ -5,7 +5,7 @@ import rollbar = require('rollbar');
 import { configs } from './configs';
 
 export const errorReporter = {
-    setup() {
+    setup(): void {
         rollbar.init(configs.ROLLBAR_ACCESS_KEY, {
             environment: configs.ENVIRONMENT,
         });
@@ -31,7 +31,7 @@ export const errorReporter = {
             });
         });
     },
-    errorHandler() {
+    errorHandler(): any {
         return rollbar.errorHandler(configs.ROLLBAR_ACCESS_KEY);
     },
 };
diff --git a/packages/testnet-faucets/src/ts/handler.ts b/packages/testnet-faucets/src/ts/handler.ts
index a6e786552..3858b5339 100644
--- a/packages/testnet-faucets/src/ts/handler.ts
+++ b/packages/testnet-faucets/src/ts/handler.ts
@@ -1,4 +1,5 @@
 import { Order, SignedOrder, ZeroEx } from '0x.js';
+import { Provider } from '@0xproject/types';
 import { BigNumber, logUtils } from '@0xproject/utils';
 import * as express from 'express';
 import * as _ from 'lodash';
@@ -38,7 +39,7 @@ const FIVE_DAYS_IN_MS = 4.32e8; // TODO: make this configurable
 
 export class Handler {
     private _networkConfigByNetworkId: ItemByNetworkId<NetworkConfig> = {};
-    private static _createProviderEngine(rpcUrl: string) {
+    private static _createProviderEngine(rpcUrl: string): Provider {
         if (_.isUndefined(configs.DISPENSER_PRIVATE_KEY)) {
             throw new Error('Dispenser Private key not found');
         }
@@ -69,7 +70,7 @@ export class Handler {
             };
         });
     }
-    public getQueueInfo(req: express.Request, res: express.Response) {
+    public getQueueInfo(req: express.Request, res: express.Response): void {
         res.setHeader('Content-Type', 'application/json');
         const queueInfo = _.mapValues(rpcUrls, (rpcUrl: string, networkId: string) => {
             const dispatchQueue = this._networkConfigByNetworkId[networkId].dispatchQueue;
@@ -81,19 +82,23 @@ export class Handler {
         const payload = JSON.stringify(queueInfo);
         res.status(200).send(payload);
     }
-    public dispenseEther(req: express.Request, res: express.Response) {
+    public dispenseEther(req: express.Request, res: express.Response): void {
         this._dispenseAsset(req, res, RequestedAssetType.ETH);
     }
-    public dispenseZRX(req: express.Request, res: express.Response) {
+    public dispenseZRX(req: express.Request, res: express.Response): void {
         this._dispenseAsset(req, res, RequestedAssetType.ZRX);
     }
-    public async dispenseWETHOrder(req: express.Request, res: express.Response) {
-        await this._dispenseOrder(req, res, RequestedAssetType.WETH);
+    public async dispenseWETHOrderAsync(req: express.Request, res: express.Response): Promise<void> {
+        await this._dispenseOrderAsync(req, res, RequestedAssetType.WETH);
     }
-    public async dispenseZRXOrder(req: express.Request, res: express.Response, next: express.NextFunction) {
-        await this._dispenseOrder(req, res, RequestedAssetType.ZRX);
+    public async dispenseZRXOrderAsync(
+        req: express.Request,
+        res: express.Response,
+        next: express.NextFunction,
+    ): Promise<void> {
+        await this._dispenseOrderAsync(req, res, RequestedAssetType.ZRX);
     }
-    private _dispenseAsset(req: express.Request, res: express.Response, requestedAssetType: RequestedAssetType) {
+    private _dispenseAsset(req: express.Request, res: express.Response, requestedAssetType: RequestedAssetType): void {
         const networkId = req.params.networkId;
         const recipient = req.params.recipient;
         const networkConfig = this._networkConfigByNetworkId[networkId];
@@ -121,7 +126,11 @@ export class Handler {
         logUtils.log(`Added ${recipient} to queue: ${requestedAssetType} networkId: ${networkId}`);
         res.status(200).end();
     }
-    private async _dispenseOrder(req: express.Request, res: express.Response, requestedAssetType: RequestedAssetType) {
+    private async _dispenseOrderAsync(
+        req: express.Request,
+        res: express.Response,
+        requestedAssetType: RequestedAssetType,
+    ): Promise<void> {
         const networkConfig = _.get(this._networkConfigByNetworkId, req.params.networkId);
         if (_.isUndefined(networkConfig)) {
             res.status(400).send('UNSUPPORTED_NETWORK_ID');
diff --git a/packages/testnet-faucets/src/ts/parameter_transformer.ts b/packages/testnet-faucets/src/ts/parameter_transformer.ts
index 2630a5e0b..58bf154dc 100644
--- a/packages/testnet-faucets/src/ts/parameter_transformer.ts
+++ b/packages/testnet-faucets/src/ts/parameter_transformer.ts
@@ -8,7 +8,7 @@ import { rpcUrls } from './rpc_urls';
 const DEFAULT_NETWORK_ID = 42; // kovan
 
 export const parameterTransformer = {
-    transform(req: Request, res: Response, next: NextFunction) {
+    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');
diff --git a/packages/testnet-faucets/src/ts/server.ts b/packages/testnet-faucets/src/ts/server.ts
index be1077756..198a5fdc9 100644
--- a/packages/testnet-faucets/src/ts/server.ts
+++ b/packages/testnet-faucets/src/ts/server.ts
@@ -23,8 +23,8 @@ app.get('/ping', (req: express.Request, res: express.Response) => {
 app.get('/info', handler.getQueueInfo.bind(handler));
 app.get('/ether/:recipient', parameterTransformer.transform, handler.dispenseEther.bind(handler));
 app.get('/zrx/:recipient', parameterTransformer.transform, handler.dispenseZRX.bind(handler));
-app.get('/order/weth/:recipient', parameterTransformer.transform, handler.dispenseWETHOrder.bind(handler));
-app.get('/order/zrx/:recipient', parameterTransformer.transform, handler.dispenseZRXOrder.bind(handler));
+app.get('/order/weth/:recipient', parameterTransformer.transform, handler.dispenseWETHOrderAsync.bind(handler));
+app.get('/order/zrx/:recipient', parameterTransformer.transform, handler.dispenseZRXOrderAsync.bind(handler));
 
 // Log to rollbar any errors unhandled by handlers
 app.use(errorReporter.errorHandler());
diff --git a/packages/tslint-config/rules/underscorePrivateAndProtectedRule.ts b/packages/tslint-config/rules/underscorePrivateAndProtectedRule.ts
index 2f05b0c18..8c039bea7 100644
--- a/packages/tslint-config/rules/underscorePrivateAndProtectedRule.ts
+++ b/packages/tslint-config/rules/underscorePrivateAndProtectedRule.ts
@@ -50,10 +50,10 @@ function isRelevantClassMember(node: ts.Node): node is RelevantClassMember {
             return false;
     }
 }
-function nameStartsWithUnderscore(text: string) {
+function nameStartsWithUnderscore(text: string): boolean {
     return text.charCodeAt(0) === UNDERSCORE.charCodeAt(0);
 }
-function memberIsPrivate(node: ts.Declaration) {
+function memberIsPrivate(node: ts.Declaration): boolean {
     return Lint.hasModifier(node.modifiers, ts.SyntaxKind.PrivateKeyword, ts.SyntaxKind.ProtectedKeyword);
 }
 function nameIsIdentifier(node: ts.Node): node is ts.Identifier {
diff --git a/packages/tslint-config/tslint.json b/packages/tslint-config/tslint.json
index aacfb6d59..1d717430d 100644
--- a/packages/tslint-config/tslint.json
+++ b/packages/tslint-config/tslint.json
@@ -18,6 +18,7 @@
         ],
         "curly": true,
         "eofline": true,
+        "typedef": [true, "call-signature", "parameter", "property-declaration"],
         "encoding": true,
         "import-spacing": true,
         "indent": [true, "spaces", 4],
diff --git a/packages/utils/src/abi_decoder.ts b/packages/utils/src/abi_decoder.ts
index 150f74a15..d329f917a 100644
--- a/packages/utils/src/abi_decoder.ts
+++ b/packages/utils/src/abi_decoder.ts
@@ -17,7 +17,7 @@ import { BigNumber } from './configured_bignumber';
 export class AbiDecoder {
     private _savedABIs: AbiDefinition[] = [];
     private _methodIds: { [signatureHash: string]: EventAbi } = {};
-    private static _padZeros(address: string) {
+    private static _padZeros(address: string): string {
         let formatted = address;
         if (_.startsWith(formatted, '0x')) {
             formatted = formatted.slice(2);
diff --git a/packages/utils/src/interval_utils.ts b/packages/utils/src/interval_utils.ts
index ebecc7015..6984bf42d 100644
--- a/packages/utils/src/interval_utils.ts
+++ b/packages/utils/src/interval_utils.ts
@@ -1,7 +1,11 @@
 import * as _ from 'lodash';
 
 export const intervalUtils = {
-    setAsyncExcludingInterval(fn: () => Promise<void>, intervalMs: number, onError: (err: Error) => void) {
+    setAsyncExcludingInterval(
+        fn: () => Promise<void>,
+        intervalMs: number,
+        onError: (err: Error) => void,
+    ): NodeJS.Timer {
         let locked = false;
         const intervalId = setInterval(async () => {
             if (locked) {
@@ -21,7 +25,7 @@ export const intervalUtils = {
     clearAsyncExcludingInterval(intervalId: NodeJS.Timer): void {
         clearInterval(intervalId);
     },
-    setInterval(fn: () => void, intervalMs: number, onError: (err: Error) => void) {
+    setInterval(fn: () => void, intervalMs: number, onError: (err: Error) => void): NodeJS.Timer {
         const intervalId = setInterval(() => {
             try {
                 fn();
diff --git a/packages/web3-wrapper/src/web3_wrapper.ts b/packages/web3-wrapper/src/web3_wrapper.ts
index 349e1ed7e..c60d5fe33 100644
--- a/packages/web3-wrapper/src/web3_wrapper.ts
+++ b/packages/web3-wrapper/src/web3_wrapper.ts
@@ -117,7 +117,7 @@ export class Web3Wrapper {
      * Update the used Web3 provider
      * @param provider The new Web3 provider to be set
      */
-    public setProvider(provider: Provider) {
+    public setProvider(provider: Provider): void {
         this._web3.setProvider(provider);
     }
     /**
@@ -333,7 +333,7 @@ export class Web3Wrapper {
      */
     public async awaitTransactionMinedAsync(
         txHash: string,
-        pollingIntervalMs = 1000,
+        pollingIntervalMs: number = 1000,
         timeoutMs?: number,
     ): Promise<TransactionReceiptWithDecodedLogs> {
         let timeoutExceeded = false;
diff --git a/packages/web3-wrapper/test/utils/chai_setup.ts b/packages/web3-wrapper/test/utils/chai_setup.ts
index 078edd309..1a8733093 100644
--- a/packages/web3-wrapper/test/utils/chai_setup.ts
+++ b/packages/web3-wrapper/test/utils/chai_setup.ts
@@ -4,7 +4,7 @@ import ChaiBigNumber = require('chai-bignumber');
 import * as dirtyChai from 'dirty-chai';
 
 export const chaiSetup = {
-    configure() {
+    configure(): void {
         chai.config.includeStack = true;
         chai.use(ChaiBigNumber());
         chai.use(dirtyChai);
diff --git a/packages/website/ts/blockchain.ts b/packages/website/ts/blockchain.ts
index e90dfa747..d7f7ebc8f 100644
--- a/packages/website/ts/blockchain.ts
+++ b/packages/website/ts/blockchain.ts
@@ -39,6 +39,7 @@ import {
     BlockchainCallErrs,
     BlockchainErrs,
     ContractInstance,
+    Fill,
     Order as PortalOrder,
     Providers,
     ProviderType,
@@ -88,7 +89,7 @@ export class Blockchain {
         }
         return providerNameIfExists;
     }
-    private static async _getProviderAsync(injectedWeb3: Web3, networkIdIfExists: number) {
+    private static async _getProviderAsync(injectedWeb3: Web3, networkIdIfExists: number): Promise<Provider> {
         const doesInjectedWeb3Exist = !_.isUndefined(injectedWeb3);
         const publicNodeUrlsIfExistsForNetworkId = configs.PUBLIC_NODE_URLS_BY_NETWORK_ID[networkIdIfExists];
         const isPublicNodeAvailableForNetworkId = !_.isUndefined(publicNodeUrlsIfExistsForNetworkId);
@@ -137,7 +138,7 @@ export class Blockchain {
         // tslint:disable-next-line:no-floating-promises
         this._onPageLoadInitFireAndForgetAsync();
     }
-    public async networkIdUpdatedFireAndForgetAsync(newNetworkId: number) {
+    public async networkIdUpdatedFireAndForgetAsync(newNetworkId: number): Promise<void> {
         const isConnected = !_.isUndefined(newNetworkId);
         if (!isConnected) {
             this.networkId = newNetworkId;
@@ -147,17 +148,17 @@ export class Blockchain {
             this.networkId = newNetworkId;
             this._dispatcher.encounteredBlockchainError(BlockchainErrs.NoError);
             await this.fetchTokenInformationAsync();
-            await this._rehydrateStoreWithContractEvents();
+            await this._rehydrateStoreWithContractEventsAsync();
         }
     }
-    public async userAddressUpdatedFireAndForgetAsync(newUserAddress: string) {
+    public async userAddressUpdatedFireAndForgetAsync(newUserAddress: string): Promise<void> {
         if (this._userAddressIfExists !== newUserAddress) {
             this._userAddressIfExists = newUserAddress;
             await this.fetchTokenInformationAsync();
-            await this._rehydrateStoreWithContractEvents();
+            await this._rehydrateStoreWithContractEventsAsync();
         }
     }
-    public async nodeVersionUpdatedFireAndForgetAsync(nodeVersion: string) {
+    public async nodeVersionUpdatedFireAndForgetAsync(nodeVersion: string): Promise<void> {
         if (this.nodeVersion !== nodeVersion) {
             this.nodeVersion = nodeVersion;
         }
@@ -174,13 +175,13 @@ export class Blockchain {
         const path = this._ledgerSubprovider.getPath();
         return path;
     }
-    public updateLedgerDerivationPathIfExists(path: string) {
+    public updateLedgerDerivationPathIfExists(path: string): void {
         if (_.isUndefined(this._ledgerSubprovider)) {
             return; // noop
         }
         this._ledgerSubprovider.setPath(path);
     }
-    public async updateProviderToLedgerAsync(networkId: number) {
+    public async updateProviderToLedgerAsync(networkId: number): Promise<void> {
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
 
         const isU2FSupported = await utils.isU2FSupportedAsync();
@@ -228,7 +229,7 @@ export class Blockchain {
         this._blockchainWatcher.startEmittingNetworkConnectionAndUserBalanceState();
         this._dispatcher.updateProviderType(ProviderType.Ledger);
     }
-    public async updateProviderToInjectedAsync() {
+    public async updateProviderToInjectedAsync(): Promise<void> {
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
 
         if (_.isUndefined(this._cachedProvider)) {
@@ -367,7 +368,7 @@ export class Blockchain {
         const unavailableTakerAmount = await this._zeroEx.exchange.getUnavailableTakerAmountAsync(orderHash);
         return unavailableTakerAmount;
     }
-    public getExchangeContractAddressIfExists() {
+    public getExchangeContractAddressIfExists(): string | undefined {
         return this._zeroEx.exchange.getContractAddress();
     }
     public async validateFillOrderThrowIfInvalidAsync(
@@ -391,7 +392,7 @@ export class Blockchain {
         const lowercaseAddress = address.toLowerCase();
         return Web3Wrapper.isAddress(lowercaseAddress);
     }
-    public async pollTokenBalanceAsync(token: Token) {
+    public async pollTokenBalanceAsync(token: Token): Promise<BigNumber> {
         utils.assert(this._doesUserAddressExist(), BlockchainCallErrs.UserHasNoAssociatedAddresses);
 
         const [currBalance] = await this.getTokenBalanceAndAllowanceAsync(this._userAddressIfExists, token.address);
@@ -445,7 +446,7 @@ export class Blockchain {
         this._dispatcher.updateECSignature(ecSignature);
         return ecSignature;
     }
-    public async mintTestTokensAsync(token: Token) {
+    public async mintTestTokensAsync(token: Token): Promise<void> {
         utils.assert(this._doesUserAddressExist(), BlockchainCallErrs.UserHasNoAssociatedAddresses);
 
         const mintableContract = await this._instantiateContractIfExistsAsync(MintableArtifacts, token.address);
@@ -489,7 +490,7 @@ export class Blockchain {
         );
         await this._showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
     }
-    public async doesContractExistAtAddressAsync(address: string) {
+    public async doesContractExistAtAddressAsync(address: string): Promise<boolean> {
         const doesContractExist = await this._web3Wrapper.doesContractExistAtAddressAsync(address);
         return doesContractExist;
     }
@@ -520,7 +521,7 @@ export class Blockchain {
         }
         return [balance, allowance];
     }
-    public async getUserAccountsAsync() {
+    public async getUserAccountsAsync(): Promise<string[]> {
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
         const userAccountsIfExists = await this._zeroEx.getAvailableAddressesAsync();
         return userAccountsIfExists;
@@ -528,14 +529,14 @@ export class Blockchain {
     // HACK: When a user is using a Ledger, we simply dispatch the selected userAddress, which
     // by-passes the web3Wrapper logic for updating the prevUserAddress. We therefore need to
     // manually update it. This should only be called by the LedgerConfigDialog.
-    public updateWeb3WrapperPrevUserAddress(newUserAddress: string) {
+    public updateWeb3WrapperPrevUserAddress(newUserAddress: string): void {
         this._blockchainWatcher.updatePrevUserAddress(newUserAddress);
     }
-    public destroy() {
+    public destroy(): void {
         this._blockchainWatcher.destroy();
         this._stopWatchingExchangeLogFillEvents();
     }
-    public async fetchTokenInformationAsync() {
+    public async fetchTokenInformationAsync(): Promise<void> {
         utils.assert(
             !_.isUndefined(this.networkId),
             'Cannot call fetchTokenInformationAsync if disconnected from Ethereum node',
@@ -624,7 +625,7 @@ export class Blockchain {
     private _doesUserAddressExist(): boolean {
         return !_.isUndefined(this._userAddressIfExists);
     }
-    private async _rehydrateStoreWithContractEvents() {
+    private async _rehydrateStoreWithContractEventsAsync(): Promise<void> {
         // Ensure we are only ever listening to one set of events
         this._stopWatchingExchangeLogFillEvents();
 
@@ -675,7 +676,7 @@ export class Blockchain {
             },
         );
     }
-    private async _fetchHistoricalExchangeLogFillEventsAsync(indexFilterValues: IndexedFilterValues) {
+    private async _fetchHistoricalExchangeLogFillEventsAsync(indexFilterValues: IndexedFilterValues): Promise<void> {
         utils.assert(this._doesUserAddressExist(), BlockchainCallErrs.UserHasNoAssociatedAddresses);
 
         const fromBlock = tradeHistoryStorage.getFillsLatestBlock(this._userAddressIfExists, this.networkId);
@@ -697,7 +698,9 @@ export class Blockchain {
             tradeHistoryStorage.addFillToUser(this._userAddressIfExists, this.networkId, fill);
         }
     }
-    private async _convertDecodedLogToFillAsync(decodedLog: LogWithDecodedArgs<LogFillContractEventArgs>) {
+    private async _convertDecodedLogToFillAsync(
+        decodedLog: LogWithDecodedArgs<LogFillContractEventArgs>,
+    ): Promise<Fill> {
         const args = decodedLog.args;
         const blockTimestamp = await this._web3Wrapper.getBlockTimestampAsync(decodedLog.blockHash);
         const fill = {
@@ -716,12 +719,12 @@ export class Blockchain {
         };
         return fill;
     }
-    private _doesLogEventInvolveUser(decodedLog: LogWithDecodedArgs<LogFillContractEventArgs>) {
+    private _doesLogEventInvolveUser(decodedLog: LogWithDecodedArgs<LogFillContractEventArgs>): boolean {
         const args = decodedLog.args;
         const isUserMakerOrTaker = args.maker === this._userAddressIfExists || args.taker === this._userAddressIfExists;
         return isUserMakerOrTaker;
     }
-    private _updateLatestFillsBlockIfNeeded(blockNumber: number) {
+    private _updateLatestFillsBlockIfNeeded(blockNumber: number): void {
         utils.assert(this._doesUserAddressExist(), BlockchainCallErrs.UserHasNoAssociatedAddresses);
 
         const isBlockPending = _.isNull(blockNumber);
@@ -762,7 +765,7 @@ export class Blockchain {
         });
         return tokenByAddress;
     }
-    private async _onPageLoadInitFireAndForgetAsync() {
+    private async _onPageLoadInitFireAndForgetAsync(): Promise<void> {
         await utils.onPageLoadAsync(); // wait for page to load
 
         // Hack: We need to know the networkId the injectedWeb3 is connected to (if it is defined) in
@@ -805,9 +808,9 @@ export class Blockchain {
         this._dispatcher.updateUserAddress(this._userAddressIfExists);
         await this.fetchTokenInformationAsync();
         this._blockchainWatcher.startEmittingNetworkConnectionAndUserBalanceState();
-        await this._rehydrateStoreWithContractEvents();
+        await this._rehydrateStoreWithContractEventsAsync();
     }
-    private _updateProviderName(injectedWeb3: Web3) {
+    private _updateProviderName(injectedWeb3: Web3): void {
         const doesInjectedWeb3Exist = !_.isUndefined(injectedWeb3);
         const providerName = doesInjectedWeb3Exist
             ? Blockchain._getNameGivenProvider(injectedWeb3.currentProvider)
@@ -849,12 +852,12 @@ export class Blockchain {
             }
         }
     }
-    private _showFlashMessageIfLedger() {
+    private _showFlashMessageIfLedger(): void {
         if (!_.isUndefined(this._ledgerSubprovider)) {
             this._dispatcher.showFlashMessage('Confirm the transaction on your Ledger Nano S');
         }
     }
-    private async _updateDefaultGasPriceAsync() {
+    private async _updateDefaultGasPriceAsync(): Promise<void> {
         try {
             const gasInfo = await backendClient.getGasInfoAsync();
             const gasPriceInGwei = new BigNumber(gasInfo.average / 10);
diff --git a/packages/website/ts/blockchain_watcher.ts b/packages/website/ts/blockchain_watcher.ts
index 2712b2c04..c420a98a4 100644
--- a/packages/website/ts/blockchain_watcher.ts
+++ b/packages/website/ts/blockchain_watcher.ts
@@ -23,8 +23,8 @@ export class BlockchainWatcher {
         this._shouldPollUserAddress = shouldPollUserAddress;
         this._web3Wrapper = web3Wrapper;
     }
-    public destroy() {
-        this._stopEmittingNetworkConnectionAndUserBalanceStateAsync();
+    public destroy(): void {
+        this._stopEmittingNetworkConnectionAndUserBalanceState();
         // HACK: stop() is only available on providerEngine instances
         const provider = this._web3Wrapper.getProvider();
         if (!_.isUndefined((provider as any).stop)) {
@@ -32,10 +32,10 @@ export class BlockchainWatcher {
         }
     }
     // This should only be called from the LedgerConfigDialog
-    public updatePrevUserAddress(userAddress: string) {
+    public updatePrevUserAddress(userAddress: string): void {
         this._prevUserAddressIfExists = userAddress;
     }
-    public startEmittingNetworkConnectionAndUserBalanceState() {
+    public startEmittingNetworkConnectionAndUserBalanceState(): void {
         if (!_.isUndefined(this._watchNetworkAndBalanceIntervalId)) {
             return; // we are already emitting the state
         }
@@ -88,18 +88,18 @@ export class BlockchainWatcher {
             5000,
             (err: Error) => {
                 logUtils.log(`Watching network and balances failed: ${err.stack}`);
-                this._stopEmittingNetworkConnectionAndUserBalanceStateAsync();
+                this._stopEmittingNetworkConnectionAndUserBalanceState();
             },
         );
     }
-    private async _updateUserWeiBalanceAsync(userAddress: string) {
+    private async _updateUserWeiBalanceAsync(userAddress: string): Promise<void> {
         const balanceInWei = await this._web3Wrapper.getBalanceInWeiAsync(userAddress);
         if (!balanceInWei.eq(this._prevUserEtherBalanceInWei)) {
             this._prevUserEtherBalanceInWei = balanceInWei;
             this._dispatcher.updateUserWeiBalance(balanceInWei);
         }
     }
-    private _stopEmittingNetworkConnectionAndUserBalanceStateAsync() {
+    private _stopEmittingNetworkConnectionAndUserBalanceState(): void {
         if (!_.isUndefined(this._watchNetworkAndBalanceIntervalId)) {
             intervalUtils.clearAsyncExcludingInterval(this._watchNetworkAndBalanceIntervalId);
         }
diff --git a/packages/website/ts/components/dialogs/blockchain_err_dialog.tsx b/packages/website/ts/components/dialogs/blockchain_err_dialog.tsx
index 1c3b7458d..7156e700b 100644
--- a/packages/website/ts/components/dialogs/blockchain_err_dialog.tsx
+++ b/packages/website/ts/components/dialogs/blockchain_err_dialog.tsx
@@ -18,7 +18,7 @@ interface BlockchainErrDialogProps {
 }
 
 export class BlockchainErrDialog extends React.Component<BlockchainErrDialogProps, undefined> {
-    public render() {
+    public render(): React.ReactNode {
         const dialogActions = [
             <FlatButton
                 key="blockchainErrOk"
@@ -45,7 +45,7 @@ export class BlockchainErrDialog extends React.Component<BlockchainErrDialogProp
             </Dialog>
         );
     }
-    private _getTitle(hasWalletAddress: boolean) {
+    private _getTitle(hasWalletAddress: boolean): string {
         if (this.props.blockchainErr === BlockchainErrs.AContractNotDeployedOnNetwork) {
             return '0x smart contracts not found';
         } else if (!hasWalletAddress) {
@@ -58,7 +58,7 @@ export class BlockchainErrDialog extends React.Component<BlockchainErrDialogProp
             return 'Unexpected error';
         }
     }
-    private _renderExplanation(hasWalletAddress: boolean) {
+    private _renderExplanation(hasWalletAddress: boolean): React.ReactNode {
         if (this.props.blockchainErr === BlockchainErrs.AContractNotDeployedOnNetwork) {
             return this._renderContractsNotDeployedExplanation();
         } else if (!hasWalletAddress) {
@@ -71,7 +71,7 @@ export class BlockchainErrDialog extends React.Component<BlockchainErrDialogProp
             return this._renderUnexpectedErrorExplanation();
         }
     }
-    private _renderDisconnectedFromNode() {
+    private _renderDisconnectedFromNode(): React.ReactNode {
         return (
             <div>
                 You were disconnected from the backing Ethereum node. If using{' '}
@@ -86,7 +86,7 @@ export class BlockchainErrDialog extends React.Component<BlockchainErrDialogProp
             </div>
         );
     }
-    private _renderDefaultTokenNotInTokenRegistry() {
+    private _renderDefaultTokenNotInTokenRegistry(): React.ReactNode {
         return (
             <div>
                 The TokenRegistry deployed on your network does not contain the needed default tokens for 0x Portal to
@@ -96,10 +96,10 @@ export class BlockchainErrDialog extends React.Component<BlockchainErrDialogProp
             </div>
         );
     }
-    private _renderUnexpectedErrorExplanation() {
+    private _renderUnexpectedErrorExplanation(): React.ReactNode {
         return <div>We encountered an unexpected error. Please try refreshing the page.</div>;
     }
-    private _renderNoWalletFoundExplanation() {
+    private _renderNoWalletFoundExplanation(): React.ReactNode {
         return (
             <div>
                 <div>
@@ -137,7 +137,7 @@ export class BlockchainErrDialog extends React.Component<BlockchainErrDialogProp
             </div>
         );
     }
-    private _renderContractsNotDeployedExplanation() {
+    private _renderContractsNotDeployedExplanation(): React.ReactNode {
         return (
             <div>
                 <div>
diff --git a/packages/website/ts/components/dialogs/eth_weth_conversion_dialog.tsx b/packages/website/ts/components/dialogs/eth_weth_conversion_dialog.tsx
index 42ca1713d..069a75560 100644
--- a/packages/website/ts/components/dialogs/eth_weth_conversion_dialog.tsx
+++ b/packages/website/ts/components/dialogs/eth_weth_conversion_dialog.tsx
@@ -47,14 +47,14 @@ export class EthWethConversionDialog extends React.Component<
             ethTokenBalance: new BigNumber(0),
         };
     }
-    public componentWillMount() {
+    public componentWillMount(): void {
         // tslint:disable-next-line:no-floating-promises
         this._fetchEthTokenBalanceAsync();
     }
-    public componentWillUnmount() {
+    public componentWillUnmount(): void {
         this._isUnmounted = true;
     }
-    public render() {
+    public render(): React.ReactNode {
         const convertDialogActions = [
             <FlatButton key="cancel" label="Cancel" onTouchTap={this._onCancel.bind(this)} />,
             <FlatButton key="convert" label="Convert" primary={true} onTouchTap={this._onConvertClick.bind(this)} />,
@@ -72,7 +72,7 @@ export class EthWethConversionDialog extends React.Component<
             </Dialog>
         );
     }
-    private _renderConversionDialogBody() {
+    private _renderConversionDialogBody(): React.ReactNode {
         const explanation =
             this.props.direction === Side.Deposit
                 ? 'Convert your Ether into a tokenized, tradable form.'
@@ -137,7 +137,7 @@ export class EthWethConversionDialog extends React.Component<
             </div>
         );
     }
-    private _renderCurrency(isWrappedVersion: boolean) {
+    private _renderCurrency(isWrappedVersion: boolean): React.ReactNode {
         const name = isWrappedVersion ? 'Wrapped Ether' : 'Ether';
         const iconUrl = isWrappedVersion ? '/images/token_icons/ether_erc20.png' : '/images/ether.png';
         const symbol = isWrappedVersion ? 'WETH' : 'ETH';
@@ -155,18 +155,18 @@ export class EthWethConversionDialog extends React.Component<
             </div>
         );
     }
-    private _onMaxClick() {
+    private _onMaxClick(): void {
         this.setState({
             value: this.state.ethTokenBalance,
         });
     }
-    private _onValueChange(isValid: boolean, amount?: BigNumber) {
+    private _onValueChange(isValid: boolean, amount?: BigNumber): void {
         this.setState({
             value: amount,
             hasErrors: !isValid,
         });
     }
-    private _onConvertClick() {
+    private _onConvertClick(): void {
         if (this.state.hasErrors) {
             this.setState({
                 shouldShowIncompleteErrs: true,
@@ -179,13 +179,13 @@ export class EthWethConversionDialog extends React.Component<
             this.props.onComplete(this.props.direction, value);
         }
     }
-    private _onCancel() {
+    private _onCancel(): void {
         this.setState({
             value: undefined,
         });
         this.props.onCancelled();
     }
-    private async _fetchEthTokenBalanceAsync() {
+    private async _fetchEthTokenBalanceAsync(): Promise<void> {
         const userAddressIfExists = _.isEmpty(this.props.userAddress) ? undefined : this.props.userAddress;
         const [balance] = await this.props.blockchain.getTokenBalanceAndAllowanceAsync(
             userAddressIfExists,
diff --git a/packages/website/ts/components/dialogs/ledger_config_dialog.tsx b/packages/website/ts/components/dialogs/ledger_config_dialog.tsx
index a72d33183..3c839d6f5 100644
--- a/packages/website/ts/components/dialogs/ledger_config_dialog.tsx
+++ b/packages/website/ts/components/dialogs/ledger_config_dialog.tsx
@@ -59,7 +59,7 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
             preferredNetworkId: props.networkId,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const dialogActions = [
             <FlatButton key="ledgerConnectCancel" label="Cancel" onTouchTap={this._onClose.bind(this)} />,
         ];
@@ -82,7 +82,7 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
             </Dialog>
         );
     }
-    private _renderConnectStep() {
+    private _renderConnectStep(): React.ReactNode {
         const networkIds = _.values(sharedConstants.NETWORK_ID_BY_NAME);
         return (
             <div>
@@ -122,7 +122,7 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
             </div>
         );
     }
-    private _renderSelectAddressStep() {
+    private _renderSelectAddressStep(): React.ReactNode {
         return (
             <div>
                 <div>
@@ -159,7 +159,7 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
             </div>
         );
     }
-    private _renderAddressTableRows() {
+    private _renderAddressTableRows(): React.ReactNode {
         const rows = _.map(this.state.userAddresses, (userAddress: string, i: number) => {
             const balanceInWei = this.state.addressBalances[i];
             const addressTooltipId = `address-${userAddress}`;
@@ -189,7 +189,7 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
         });
         return rows;
     }
-    private _onClose() {
+    private _onClose(): void {
         this.setState({
             connectionErrMsg: '',
             stepIndex: LedgerSteps.CONNECT,
@@ -197,7 +197,7 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
         const isOpen = false;
         this.props.toggleDialogFn(isOpen);
     }
-    private _onAddressSelected(selectedRowIndexes: number[]) {
+    private _onAddressSelected(selectedRowIndexes: number[]): void {
         const selectedRowIndex = selectedRowIndexes[0];
         const selectedAddress = this.state.userAddresses[selectedRowIndex];
         const selectAddressBalance = this.state.addressBalances[selectedRowIndex];
@@ -228,7 +228,7 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
         }
         return didSucceed;
     }
-    private async _fetchAddressesAndBalancesAsync() {
+    private async _fetchAddressesAndBalancesAsync(): Promise<boolean> {
         let userAddresses: string[];
         const addressBalances: BigNumber[] = [];
         try {
@@ -250,7 +250,7 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
         });
         return true;
     }
-    private _onDerivationPathChanged(e: any, derivationPath: string) {
+    private _onDerivationPathChanged(e: any, derivationPath: string): void {
         let derivationErrMsg = '';
         if (!_.startsWith(derivationPath, VALID_ETHEREUM_DERIVATION_PATH_PREFIX)) {
             derivationErrMsg = 'Must be valid Ethereum path.';
@@ -261,7 +261,7 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
             derivationErrMsg,
         });
     }
-    private async _onConnectLedgerClickAsync() {
+    private async _onConnectLedgerClickAsync(): Promise<boolean> {
         const isU2FSupported = await utils.isU2FSupportedAsync();
         if (!isU2FSupported) {
             logUtils.log(`U2F not supported in this browser`);
@@ -295,7 +295,7 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
         }
         return userAddresses;
     }
-    private _onSelectedNetworkUpdated(e: any, index: number, networkId: number) {
+    private _onSelectedNetworkUpdated(e: any, index: number, networkId: number): void {
         this.setState({
             preferredNetworkId: networkId,
         });
diff --git a/packages/website/ts/components/dialogs/portal_disclaimer_dialog.tsx b/packages/website/ts/components/dialogs/portal_disclaimer_dialog.tsx
index b31667121..41a17fe96 100644
--- a/packages/website/ts/components/dialogs/portal_disclaimer_dialog.tsx
+++ b/packages/website/ts/components/dialogs/portal_disclaimer_dialog.tsx
@@ -8,7 +8,7 @@ interface PortalDisclaimerDialogProps {
     onToggleDialog: () => void;
 }
 
-export function PortalDisclaimerDialog(props: PortalDisclaimerDialogProps) {
+export const PortalDisclaimerDialog = (props: PortalDisclaimerDialogProps) => {
     return (
         <Dialog
             title="0x Portal Disclaimer"
@@ -33,4 +33,4 @@ export function PortalDisclaimerDialog(props: PortalDisclaimerDialogProps) {
             </div>
         </Dialog>
     );
-}
+};
diff --git a/packages/website/ts/components/dialogs/send_dialog.tsx b/packages/website/ts/components/dialogs/send_dialog.tsx
index 2af7fd7ac..421f18b4f 100644
--- a/packages/website/ts/components/dialogs/send_dialog.tsx
+++ b/packages/website/ts/components/dialogs/send_dialog.tsx
@@ -35,7 +35,7 @@ export class SendDialog extends React.Component<SendDialogProps, SendDialogState
             isAmountValid: false,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const transferDialogActions = [
             <FlatButton key="cancelTransfer" label="Cancel" onTouchTap={this._onCancel.bind(this)} />,
             <FlatButton
@@ -57,7 +57,7 @@ export class SendDialog extends React.Component<SendDialogProps, SendDialogState
             </Dialog>
         );
     }
-    private _renderSendDialogBody() {
+    private _renderSendDialogBody(): React.ReactNode {
         return (
             <div className="mx-auto" style={{ maxWidth: 300 }}>
                 <div style={{ height: 80 }}>
@@ -86,19 +86,19 @@ export class SendDialog extends React.Component<SendDialogProps, SendDialogState
             </div>
         );
     }
-    private _onRecipientChange(recipient?: string) {
+    private _onRecipientChange(recipient?: string): void {
         this.setState({
             shouldShowIncompleteErrs: false,
             recipient,
         });
     }
-    private _onValueChange(isValid: boolean, amount?: BigNumber) {
+    private _onValueChange(isValid: boolean, amount?: BigNumber): void {
         this.setState({
             isAmountValid: isValid,
             value: amount,
         });
     }
-    private _onSendClick() {
+    private _onSendClick(): void {
         if (this._hasErrors()) {
             this.setState({
                 shouldShowIncompleteErrs: true,
@@ -112,13 +112,13 @@ export class SendDialog extends React.Component<SendDialogProps, SendDialogState
             this.props.onComplete(this.state.recipient, value);
         }
     }
-    private _onCancel() {
+    private _onCancel(): void {
         this.setState({
             value: undefined,
         });
         this.props.onCancelled();
     }
-    private _hasErrors() {
+    private _hasErrors(): boolean {
         return _.isUndefined(this.state.recipient) || _.isUndefined(this.state.value) || !this.state.isAmountValid;
     }
 }
diff --git a/packages/website/ts/components/dialogs/track_token_confirmation_dialog.tsx b/packages/website/ts/components/dialogs/track_token_confirmation_dialog.tsx
index bb7e3ed1a..ac0b27cdc 100644
--- a/packages/website/ts/components/dialogs/track_token_confirmation_dialog.tsx
+++ b/packages/website/ts/components/dialogs/track_token_confirmation_dialog.tsx
@@ -33,7 +33,7 @@ export class TrackTokenConfirmationDialog extends React.Component<
             isAddingTokenToTracked: false,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const tokens = this.props.tokens;
         return (
             <Dialog
@@ -66,7 +66,7 @@ export class TrackTokenConfirmationDialog extends React.Component<
             </Dialog>
         );
     }
-    private async _onTrackConfirmationRespondedAsync(didUserAcceptTracking: boolean) {
+    private async _onTrackConfirmationRespondedAsync(didUserAcceptTracking: boolean): Promise<void> {
         if (!didUserAcceptTracking) {
             this.props.onToggleDialog(didUserAcceptTracking);
             return;
diff --git a/packages/website/ts/components/dialogs/u2f_not_supported_dialog.tsx b/packages/website/ts/components/dialogs/u2f_not_supported_dialog.tsx
index 6ac9cf917..ce86df856 100644
--- a/packages/website/ts/components/dialogs/u2f_not_supported_dialog.tsx
+++ b/packages/website/ts/components/dialogs/u2f_not_supported_dialog.tsx
@@ -9,7 +9,7 @@ interface U2fNotSupportedDialogProps {
     onToggleDialog: () => void;
 }
 
-export function U2fNotSupportedDialog(props: U2fNotSupportedDialogProps) {
+export const U2fNotSupportedDialog = (props: U2fNotSupportedDialogProps) => {
     return (
         <Dialog
             title="U2F Not Supported"
@@ -43,4 +43,4 @@ export function U2fNotSupportedDialog(props: U2fNotSupportedDialogProps) {
             </div>
         </Dialog>
     );
-}
+};
diff --git a/packages/website/ts/components/dialogs/wrapped_eth_section_notice_dialog.tsx b/packages/website/ts/components/dialogs/wrapped_eth_section_notice_dialog.tsx
index 9e91ff12d..78b270c1e 100644
--- a/packages/website/ts/components/dialogs/wrapped_eth_section_notice_dialog.tsx
+++ b/packages/website/ts/components/dialogs/wrapped_eth_section_notice_dialog.tsx
@@ -8,7 +8,7 @@ interface WrappedEthSectionNoticeDialogProps {
     onToggleDialog: () => void;
 }
 
-export function WrappedEthSectionNoticeDialog(props: WrappedEthSectionNoticeDialogProps) {
+export const WrappedEthSectionNoticeDialog = (props: WrappedEthSectionNoticeDialogProps) => {
     return (
         <Dialog
             title="Dedicated Wrapped Ether Section"
@@ -30,4 +30,4 @@ export function WrappedEthSectionNoticeDialog(props: WrappedEthSectionNoticeDial
             </div>
         </Dialog>
     );
-}
+};
diff --git a/packages/website/ts/components/dropdowns/network_drop_down.tsx b/packages/website/ts/components/dropdowns/network_drop_down.tsx
index b569807dd..2fd2785d1 100644
--- a/packages/website/ts/components/dropdowns/network_drop_down.tsx
+++ b/packages/website/ts/components/dropdowns/network_drop_down.tsx
@@ -13,7 +13,7 @@ interface NetworkDropDownProps {
 interface NetworkDropDownState {}
 
 export class NetworkDropDown extends React.Component<NetworkDropDownProps, NetworkDropDownState> {
-    public render() {
+    public render(): React.ReactNode {
         return (
             <div className="mx-auto" style={{ width: 120 }}>
                 <DropDownMenu value={this.props.selectedNetworkId} onChange={this.props.updateSelectedNetwork}>
@@ -22,7 +22,7 @@ export class NetworkDropDown extends React.Component<NetworkDropDownProps, Netwo
             </div>
         );
     }
-    private _renderDropDownItems() {
+    private _renderDropDownItems(): React.ReactNode {
         const items = _.map(this.props.avialableNetworkIds, networkId => {
             const networkName = sharedConstants.NETWORK_NAME_BY_ID[networkId];
             const primaryText = (
diff --git a/packages/website/ts/components/eth_weth_conversion_button.tsx b/packages/website/ts/components/eth_weth_conversion_button.tsx
index 586d260fb..e8db42a7a 100644
--- a/packages/website/ts/components/eth_weth_conversion_button.tsx
+++ b/packages/website/ts/components/eth_weth_conversion_button.tsx
@@ -46,7 +46,7 @@ export class EthWethConversionButton extends React.Component<
             isEthConversionHappening: false,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const labelStyle = this.state.isEthConversionHappening ? { fontSize: 10 } : {};
         let callToActionLabel;
         let inProgressLabel;
@@ -81,12 +81,12 @@ export class EthWethConversionButton extends React.Component<
             </div>
         );
     }
-    private _toggleConversionDialog() {
+    private _toggleConversionDialog(): void {
         this.setState({
             isEthConversionDialogVisible: !this.state.isEthConversionDialogVisible,
         });
     }
-    private async _onConversionAmountSelectedAsync(direction: Side, value: BigNumber) {
+    private async _onConversionAmountSelectedAsync(direction: Side, value: BigNumber): Promise<void> {
         this.setState({
             isEthConversionHappening: true,
         });
diff --git a/packages/website/ts/components/eth_wrappers.tsx b/packages/website/ts/components/eth_wrappers.tsx
index 59afeb50b..f19b05861 100644
--- a/packages/website/ts/components/eth_wrappers.tsx
+++ b/packages/website/ts/components/eth_wrappers.tsx
@@ -65,7 +65,7 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
             },
         };
     }
-    public componentWillReceiveProps(nextProps: EthWrappersProps) {
+    public componentWillReceiveProps(nextProps: EthWrappersProps): void {
         if (
             nextProps.userAddress !== this.props.userAddress ||
             nextProps.networkId !== this.props.networkId ||
@@ -75,15 +75,15 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
             this._fetchWETHStateAsync();
         }
     }
-    public componentDidMount() {
+    public componentDidMount(): void {
         window.scrollTo(0, 0);
         // tslint:disable-next-line:no-floating-promises
         this._fetchWETHStateAsync();
     }
-    public componentWillUnmount() {
+    public componentWillUnmount(): void {
         this._isUnmounted = true;
     }
-    public render() {
+    public render(): React.ReactNode {
         const etherToken = this._getEthToken();
         const wethBalance = ZeroEx.toUnitAmount(this.state.ethTokenState.balance, constants.DECIMAL_PLACES_ETH);
         const isBidirectional = true;
@@ -222,7 +222,7 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
             </div>
         );
     }
-    private _renderActionColumnTitle(isBidirectional: boolean) {
+    private _renderActionColumnTitle(isBidirectional: boolean): React.ReactNode {
         let iconClass = 'zmdi-long-arrow-right';
         let leftSymbol = 'WETH';
         let rightSymbol = 'ETH';
@@ -241,7 +241,7 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
             </div>
         );
     }
-    private _renderOutdatedWeths(etherToken: Token, etherTokenState: TokenState) {
+    private _renderOutdatedWeths(etherToken: Token, etherTokenState: TokenState): React.ReactNode {
         const rows = _.map(
             configs.OUTDATED_WRAPPED_ETHERS,
             (outdatedWETHByNetworkId: OutdatedWrappedEtherByNetworkId) => {
@@ -313,7 +313,7 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
         );
         return rows;
     }
-    private _renderTokenLink(tokenLabel: React.ReactNode, etherscanUrl: string) {
+    private _renderTokenLink(tokenLabel: React.ReactNode, etherscanUrl: string): React.ReactNode {
         return (
             <span>
                 {_.isUndefined(etherscanUrl) ? (
@@ -326,7 +326,7 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
             </span>
         );
     }
-    private _renderToken(name: string, address: string, imgPath: string) {
+    private _renderToken(name: string, address: string, imgPath: string): React.ReactNode {
         const tooltipId = `tooltip-${address}`;
         return (
             <div className="flex">
@@ -340,7 +340,7 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
             </div>
         );
     }
-    private async _onOutdatedConversionSuccessfulAsync(outdatedWETHAddress: string) {
+    private async _onOutdatedConversionSuccessfulAsync(outdatedWETHAddress: string): Promise<void> {
         const currentOutdatedWETHState = this.state.outdatedWETHStateByAddress[outdatedWETHAddress];
         this.setState({
             outdatedWETHStateByAddress: {
@@ -368,7 +368,7 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
             },
         });
     }
-    private async _fetchWETHStateAsync() {
+    private async _fetchWETHStateAsync(): Promise<void> {
         const tokens = _.values(this.props.tokenByAddress);
         const wethToken = _.find(tokens, token => token.symbol === 'WETH');
         const userAddressIfExists = _.isEmpty(this.props.userAddress) ? undefined : this.props.userAddress;
@@ -414,12 +414,12 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
         );
         return outdatedWETHAddresses;
     }
-    private _getEthToken() {
+    private _getEthToken(): Token {
         const tokens = _.values(this.props.tokenByAddress);
         const etherToken = _.find(tokens, { symbol: 'WETH' });
         return etherToken;
     }
-    private async _refetchEthTokenStateAsync() {
+    private async _refetchEthTokenStateAsync(): Promise<void> {
         const etherToken = this._getEthToken();
         const userAddressIfExists = _.isEmpty(this.props.userAddress) ? undefined : this.props.userAddress;
         const [balance, allowance] = await this.props.blockchain.getTokenBalanceAndAllowanceAsync(
diff --git a/packages/website/ts/components/fill_order.tsx b/packages/website/ts/components/fill_order.tsx
index ea94e0987..59c32cebc 100644
--- a/packages/website/ts/components/fill_order.tsx
+++ b/packages/website/ts/components/fill_order.tsx
@@ -82,19 +82,19 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
             tokensToTrack: [],
         };
     }
-    public componentWillMount() {
+    public componentWillMount(): void {
         if (!_.isEmpty(this.state.orderJSON)) {
             // tslint:disable-next-line:no-floating-promises
             this._validateFillOrderFireAndForgetAsync(this.state.orderJSON);
         }
     }
-    public componentDidMount() {
+    public componentDidMount(): void {
         window.scrollTo(0, 0);
     }
-    public componentWillUnmount() {
+    public componentWillUnmount(): void {
         this._isUnmounted = true;
     }
-    public render() {
+    public render(): React.ReactNode {
         return (
             <div className="clearfix lg-px4 md-px4 sm-px2" style={{ minHeight: 600 }}>
                 <h3>Fill an order</h3>
@@ -159,7 +159,7 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
             </div>
         );
     }
-    private _renderOrderJsonNotices() {
+    private _renderOrderJsonNotices(): React.ReactNode {
         return (
             <div>
                 {!_.isUndefined(this.props.initialOrder) &&
@@ -177,7 +177,7 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
             </div>
         );
     }
-    private _renderVisualOrder() {
+    private _renderVisualOrder(): React.ReactNode {
         const takerTokenAddress = this.state.parsedOrder.signedOrder.takerTokenAddress;
         const takerToken = this.props.tokenByAddress[takerTokenAddress];
         const orderTakerAmount = new BigNumber(this.state.parsedOrder.signedOrder.takerTokenAmount);
@@ -306,7 +306,7 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
             </div>
         );
     }
-    private _renderFillSuccessMsg() {
+    private _renderFillSuccessMsg(): React.ReactNode {
         return (
             <div>
                 Order successfully filled. See the trade details in your{' '}
@@ -316,10 +316,10 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
             </div>
         );
     }
-    private _renderCancelSuccessMsg() {
+    private _renderCancelSuccessMsg(): React.ReactNode {
         return <div>Order successfully cancelled.</div>;
     }
-    private _onFillOrderClick() {
+    private _onFillOrderClick(): void {
         if (!this.state.isMakerTokenAddressInRegistry || !this.state.isTakerTokenAddressInRegistry) {
             this.setState({
                 isFillWarningDialogOpen: true,
@@ -329,7 +329,7 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
             this._onFillOrderClickFireAndForgetAsync();
         }
     }
-    private _onFillWarningClosed(didUserCancel: boolean) {
+    private _onFillWarningClosed(didUserCancel: boolean): void {
         this.setState({
             isFillWarningDialogOpen: false,
         });
@@ -338,10 +338,10 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
             this._onFillOrderClickFireAndForgetAsync();
         }
     }
-    private _onFillAmountChange(isValid: boolean, amount?: BigNumber) {
+    private _onFillAmountChange(isValid: boolean, amount?: BigNumber): void {
         this.props.dispatcher.updateOrderFillAmount(amount);
     }
-    private _onFillOrderJSONChanged(event: any) {
+    private _onFillOrderJSONChanged(event: any): void {
         const orderJSON = event.target.value;
         this.setState({
             didOrderValidationRun: _.isEmpty(orderJSON) && _.isEmpty(this.state.orderJSONErrMsg),
@@ -350,7 +350,7 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
         // tslint:disable-next-line:no-floating-promises
         this._validateFillOrderFireAndForgetAsync(orderJSON);
     }
-    private async _checkForUntrackedTokensAndAskToAdd() {
+    private async _checkForUntrackedTokensAndAskToAddAsync(): Promise<void> {
         if (!_.isEmpty(this.state.orderJSONErrMsg)) {
             return;
         }
@@ -396,7 +396,7 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
             });
         }
     }
-    private async _validateFillOrderFireAndForgetAsync(orderJSON: string) {
+    private async _validateFillOrderFireAndForgetAsync(orderJSON: string): Promise<void> {
         let orderJSONErrMsg = '';
         let parsedOrder: Order;
         let orderHash: string;
@@ -491,7 +491,7 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
             unavailableTakerAmount,
         });
 
-        await this._checkForUntrackedTokensAndAskToAdd();
+        await this._checkForUntrackedTokensAndAskToAddAsync();
     }
     private async _onFillOrderClickFireAndForgetAsync(): Promise<void> {
         if (this.props.blockchainErr !== BlockchainErrs.NoError || _.isEmpty(this.props.userAddress)) {
@@ -650,7 +650,7 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
         const roundedUnitAmount = Math.round(unitAmount.toNumber() * 100000) / 100000;
         return roundedUnitAmount;
     }
-    private _onToggleTrackConfirmDialog(didConfirmTokenTracking: boolean) {
+    private _onToggleTrackConfirmDialog(didConfirmTokenTracking: boolean): void {
         if (!didConfirmTokenTracking) {
             this.setState({
                 orderJSON: '',
diff --git a/packages/website/ts/components/fill_order_json.tsx b/packages/website/ts/components/fill_order_json.tsx
index 7d5351ec4..97297d5a1 100644
--- a/packages/website/ts/components/fill_order_json.tsx
+++ b/packages/website/ts/components/fill_order_json.tsx
@@ -19,7 +19,7 @@ interface FillOrderJSONProps {
 interface FillOrderJSONState {}
 
 export class FillOrderJSON extends React.Component<FillOrderJSONProps, FillOrderJSONState> {
-    public render() {
+    public render(): React.ReactNode {
         const tokenAddresses = _.keys(this.props.tokenByAddress);
         const exchangeContract = this.props.blockchain.getExchangeContractAddressIfExists();
         const hintSideToAssetToken = {
diff --git a/packages/website/ts/components/fill_warning_dialog.tsx b/packages/website/ts/components/fill_warning_dialog.tsx
index d3215a6c1..83095b1d3 100644
--- a/packages/website/ts/components/fill_warning_dialog.tsx
+++ b/packages/website/ts/components/fill_warning_dialog.tsx
@@ -8,7 +8,7 @@ interface FillWarningDialogProps {
     onToggleDialog: (didUserCancel: boolean) => void;
 }
 
-export function FillWarningDialog(props: FillWarningDialogProps) {
+export const FillWarningDialog = (props: FillWarningDialogProps) => {
     const didCancel = true;
     return (
         <Dialog
@@ -42,4 +42,4 @@ export function FillWarningDialog(props: FillWarningDialogProps) {
             </div>
         </Dialog>
     );
-}
+};
diff --git a/packages/website/ts/components/flash_messages/token_send_completed.tsx b/packages/website/ts/components/flash_messages/token_send_completed.tsx
index a3b056758..bb5adfa4e 100644
--- a/packages/website/ts/components/flash_messages/token_send_completed.tsx
+++ b/packages/website/ts/components/flash_messages/token_send_completed.tsx
@@ -16,7 +16,7 @@ interface TokenSendCompletedProps {
 interface TokenSendCompletedState {}
 
 export class TokenSendCompleted extends React.Component<TokenSendCompletedProps, TokenSendCompletedState> {
-    public render() {
+    public render(): React.ReactNode {
         const etherScanLink = !_.isUndefined(this.props.etherScanLinkIfExists) && (
             <a style={{ color: colors.white }} href={`${this.props.etherScanLinkIfExists}`} target="_blank">
                 Verify on Etherscan
diff --git a/packages/website/ts/components/flash_messages/transaction_submitted.tsx b/packages/website/ts/components/flash_messages/transaction_submitted.tsx
index 188f1f9a6..2a6d2a64b 100644
--- a/packages/website/ts/components/flash_messages/transaction_submitted.tsx
+++ b/packages/website/ts/components/flash_messages/transaction_submitted.tsx
@@ -9,7 +9,7 @@ interface TransactionSubmittedProps {
 interface TransactionSubmittedState {}
 
 export class TransactionSubmitted extends React.Component<TransactionSubmittedProps, TransactionSubmittedState> {
-    public render() {
+    public render(): React.ReactNode {
         if (_.isUndefined(this.props.etherScanLinkIfExists)) {
             return <div>Transaction submitted to the network</div>;
         } else {
diff --git a/packages/website/ts/components/footer.tsx b/packages/website/ts/components/footer.tsx
index 487b039b2..c44e41084 100644
--- a/packages/website/ts/components/footer.tsx
+++ b/packages/website/ts/components/footer.tsx
@@ -50,7 +50,7 @@ export class Footer extends React.Component<FooterProps, FooterState> {
             selectedLanguage: props.translate.getLanguage(),
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const menuItemsBySection: MenuItemsBySection = {
             [Key.Documentation]: [
                 {
@@ -180,14 +180,14 @@ export class Footer extends React.Component<FooterProps, FooterState> {
             </div>
         );
     }
-    private _renderIcon(fileName: string) {
+    private _renderIcon(fileName: string): React.ReactNode {
         return (
             <div style={{ height: ICON_DIMENSION, width: ICON_DIMENSION }}>
                 <img src={`/images/social/${fileName}`} style={{ width: ICON_DIMENSION }} />
             </div>
         );
     }
-    private _renderMenuItem(item: FooterMenuItem) {
+    private _renderMenuItem(item: FooterMenuItem): React.ReactNode {
         const titleToIcon: { [title: string]: string } = {
             [this.props.translate.get(Key.RocketChat, Deco.Cap)]: 'rocketchat.png',
             [this.props.translate.get(Key.Blog, Deco.Cap)]: 'medium.png',
@@ -222,7 +222,7 @@ export class Footer extends React.Component<FooterProps, FooterState> {
             </div>
         );
     }
-    private _renderHeader(key: Key) {
+    private _renderHeader(key: Key): React.ReactNode {
         const headerStyle = {
             color: colors.grey400,
             letterSpacing: 2,
@@ -235,7 +235,7 @@ export class Footer extends React.Component<FooterProps, FooterState> {
             </div>
         );
     }
-    private _updateLanguage(e: any, index: number, value: Language) {
+    private _updateLanguage(e: any, index: number, value: Language): void {
         this.setState({
             selectedLanguage: value,
         });
diff --git a/packages/website/ts/components/generate_order/asset_picker.tsx b/packages/website/ts/components/generate_order/asset_picker.tsx
index 69fb32a21..d7cc554c4 100644
--- a/packages/website/ts/components/generate_order/asset_picker.tsx
+++ b/packages/website/ts/components/generate_order/asset_picker.tsx
@@ -79,7 +79,7 @@ export class AssetPicker extends React.Component<AssetPickerProps, AssetPickerSt
             },
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const dialogConfigs: DialogConfigs = this._dialogConfigsByAssetView[this.state.assetView];
         return (
             <Dialog
@@ -102,7 +102,7 @@ export class AssetPicker extends React.Component<AssetPickerProps, AssetPickerSt
             </Dialog>
         );
     }
-    private _renderConfirmTrackToken() {
+    private _renderConfirmTrackToken(): React.ReactNode {
         const token = this.props.tokenByAddress[this.state.chosenTrackTokenAddress];
         return (
             <TrackTokenConfirmation
@@ -113,7 +113,7 @@ export class AssetPicker extends React.Component<AssetPickerProps, AssetPickerSt
             />
         );
     }
-    private _renderAssetPicker() {
+    private _renderAssetPicker(): React.ReactNode {
         return (
             <div
                 className="clearfix flex flex-wrap"
@@ -128,7 +128,7 @@ export class AssetPicker extends React.Component<AssetPickerProps, AssetPickerSt
             </div>
         );
     }
-    private _renderGridTiles() {
+    private _renderGridTiles(): React.ReactNode {
         let isHovered;
         let tileStyles;
         const gridTiles = _.map(this.props.tokenByAddress, (token: Token, address: string) => {
@@ -195,19 +195,19 @@ export class AssetPicker extends React.Component<AssetPickerProps, AssetPickerSt
         }
         return gridTiles;
     }
-    private _onToggleHover(address: string, isHovered: boolean) {
+    private _onToggleHover(address: string, isHovered: boolean): void {
         const hoveredAddress = isHovered ? address : undefined;
         this.setState({
             hoveredAddress,
         });
     }
-    private _onCloseDialog() {
+    private _onCloseDialog(): void {
         this.setState({
             assetView: AssetViews.ASSET_PICKER,
         });
         this.props.onTokenChosen(this.props.currentTokenAddress);
     }
-    private _onChooseToken(tokenAddress: string) {
+    private _onChooseToken(tokenAddress: string): void {
         const token = this.props.tokenByAddress[tokenAddress];
         if (token.isTracked) {
             this.props.onTokenChosen(tokenAddress);
@@ -218,12 +218,12 @@ export class AssetPicker extends React.Component<AssetPickerProps, AssetPickerSt
             });
         }
     }
-    private _onCustomAssetChosen() {
+    private _onCustomAssetChosen(): void {
         this.setState({
             assetView: AssetViews.NEW_TOKEN_FORM,
         });
     }
-    private _onNewTokenSubmitted(newToken: Token) {
+    private _onNewTokenSubmitted(newToken: Token): void {
         trackedTokenStorage.addTrackedTokenToUser(this.props.userAddress, this.props.networkId, newToken);
         this.props.dispatcher.addTokenToTokenByAddress(newToken);
         this.setState({
@@ -231,7 +231,7 @@ export class AssetPicker extends React.Component<AssetPickerProps, AssetPickerSt
         });
         this.props.onTokenChosen(newToken.address);
     }
-    private async _onTrackConfirmationRespondedAsync(didUserAcceptTracking: boolean) {
+    private async _onTrackConfirmationRespondedAsync(didUserAcceptTracking: boolean): Promise<void> {
         if (!didUserAcceptTracking) {
             this.setState({
                 isAddingTokenToTracked: false,
diff --git a/packages/website/ts/components/generate_order/generate_order_form.tsx b/packages/website/ts/components/generate_order/generate_order_form.tsx
index eb76cb529..d46c29058 100644
--- a/packages/website/ts/components/generate_order/generate_order_form.tsx
+++ b/packages/website/ts/components/generate_order/generate_order_form.tsx
@@ -63,10 +63,10 @@ export class GenerateOrderForm extends React.Component<GenerateOrderFormProps, G
             signingState: SigningState.UNSIGNED,
         };
     }
-    public componentDidMount() {
+    public componentDidMount(): void {
         window.scrollTo(0, 0);
     }
-    public render() {
+    public render(): React.ReactNode {
         const dispatcher = this.props.dispatcher;
         const depositTokenAddress = this.props.sideToAssetToken[Side.Deposit].address;
         const depositToken = this.props.tokenByAddress[depositTokenAddress];
@@ -214,13 +214,13 @@ export class GenerateOrderForm extends React.Component<GenerateOrderFormProps, G
             </div>
         );
     }
-    private _onTokenAmountChange(token: Token, side: Side, isValid: boolean, amount?: BigNumber) {
+    private _onTokenAmountChange(token: Token, side: Side, isValid: boolean, amount?: BigNumber): void {
         this.props.dispatcher.updateChosenAssetToken(side, {
             address: token.address,
             amount,
         });
     }
-    private _onCloseOrderJSONDialog() {
+    private _onCloseOrderJSONDialog(): void {
         // Upon closing the order JSON dialog, we update the orderSalt stored in the Redux store
         // with a new value so that if a user signs the identical order again, the newly signed
         // orderHash will not collide with the previously generated orderHash.
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 e7f3b93c6..10f71b430 100644
--- a/packages/website/ts/components/generate_order/new_token_form.tsx
+++ b/packages/website/ts/components/generate_order/new_token_form.tsx
@@ -42,7 +42,7 @@ export class NewTokenForm extends React.Component<NewTokenFormProps, NewTokenFor
             decimalsErrText: '',
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         return (
             <div className="mx-auto pb2" style={{ width: 256 }}>
                 <div>
@@ -96,7 +96,7 @@ export class NewTokenForm extends React.Component<NewTokenFormProps, NewTokenFor
             </div>
         );
     }
-    private async _onAddNewTokenClickAsync() {
+    private async _onAddNewTokenClickAsync(): Promise<void> {
         // Trigger validation of name and symbol
         this._onTokenNameChanged(undefined, this.state.name);
         this._onTokenSymbolChanged(undefined, this.state.symbol);
@@ -152,7 +152,7 @@ export class NewTokenForm extends React.Component<NewTokenFormProps, NewTokenFor
         };
         this.props.onNewTokenSubmitted(newToken);
     }
-    private _onTokenNameChanged(e: any, name: string) {
+    private _onTokenNameChanged(e: any, name: string): void {
         let nameErrText = '';
         const maxLength = 30;
         const tokens = _.values(this.props.tokenByAddress);
@@ -173,7 +173,7 @@ export class NewTokenForm extends React.Component<NewTokenFormProps, NewTokenFor
             nameErrText,
         });
     }
-    private _onTokenSymbolChanged(e: any, symbol: string) {
+    private _onTokenSymbolChanged(e: any, symbol: string): void {
         let symbolErrText = '';
         const maxLength = 5;
         const tokens = _.values(this.props.tokenByAddress);
@@ -193,7 +193,7 @@ export class NewTokenForm extends React.Component<NewTokenFormProps, NewTokenFor
             symbolErrText,
         });
     }
-    private _onTokenDecimalsChanged(e: any, decimals: string) {
+    private _onTokenDecimalsChanged(e: any, decimals: string): void {
         let decimalsErrText = '';
         const maxLength = 2;
         if (decimals === '') {
@@ -209,20 +209,20 @@ export class NewTokenForm extends React.Component<NewTokenFormProps, NewTokenFor
             decimalsErrText,
         });
     }
-    private _onTokenAddressChanged(address?: string) {
+    private _onTokenAddressChanged(address?: string): void {
         if (!_.isUndefined(address)) {
             this.setState({
                 address,
             });
         }
     }
-    private _isValidName(input: string) {
+    private _isValidName(input: string): boolean {
         return /^[a-z0-9 ]+$/i.test(input);
     }
-    private _isInteger(input: string) {
+    private _isInteger(input: string): boolean {
         return /^[0-9]+$/i.test(input);
     }
-    private _isAlphanumeric(input: string) {
+    private _isAlphanumeric(input: string): boolean {
         return /^[a-zA-Z0-9]+$/i.test(input);
     }
 }
diff --git a/packages/website/ts/components/inputs/address_input.tsx b/packages/website/ts/components/inputs/address_input.tsx
index 7ca4af968..39ec72f8a 100644
--- a/packages/website/ts/components/inputs/address_input.tsx
+++ b/packages/website/ts/components/inputs/address_input.tsx
@@ -29,14 +29,14 @@ export class AddressInput extends React.Component<AddressInputProps, AddressInpu
             errMsg: '',
         };
     }
-    public componentWillReceiveProps(nextProps: AddressInputProps) {
+    public componentWillReceiveProps(nextProps: AddressInputProps): void {
         if (nextProps.shouldShowIncompleteErrs && this.props.isRequired && this.state.address === '') {
             this.setState({
                 errMsg: 'Address is required',
             });
         }
     }
-    public render() {
+    public render(): React.ReactNode {
         const label = this.props.isRequired ? <RequiredLabel label={this.props.label} /> : this.props.label;
         const labelDisplay = this.props.shouldHideLabel ? 'hidden' : 'block';
         const hintText = this.props.hintText ? this.props.hintText : '';
@@ -57,7 +57,7 @@ export class AddressInput extends React.Component<AddressInputProps, AddressInpu
             </div>
         );
     }
-    private _onOrderTakerAddressUpdated(e: any) {
+    private _onOrderTakerAddressUpdated(e: any): void {
         const address = e.target.value.toLowerCase();
         const isValidAddress = addressUtils.isAddress(address) || address === '';
         const errMsg = isValidAddress ? '' : 'Invalid ethereum address';
diff --git a/packages/website/ts/components/inputs/allowance_toggle.tsx b/packages/website/ts/components/inputs/allowance_toggle.tsx
index cfe75b751..48c7f9f57 100644
--- a/packages/website/ts/components/inputs/allowance_toggle.tsx
+++ b/packages/website/ts/components/inputs/allowance_toggle.tsx
@@ -63,7 +63,7 @@ export class AllowanceToggle extends React.Component<AllowanceToggleProps, Allow
             prevAllowance: props.tokenState.allowance,
         };
     }
-    public componentWillReceiveProps(nextProps: AllowanceToggleProps) {
+    public componentWillReceiveProps(nextProps: AllowanceToggleProps): void {
         if (!nextProps.tokenState.allowance.eq(this.state.prevAllowance)) {
             this.setState({
                 isSpinnerVisible: false,
@@ -71,7 +71,7 @@ export class AllowanceToggle extends React.Component<AllowanceToggleProps, Allow
             });
         }
     }
-    public render() {
+    public render(): React.ReactNode {
         return (
             <div className="flex">
                 <div>
@@ -128,7 +128,7 @@ export class AllowanceToggle extends React.Component<AllowanceToggleProps, Allow
             await errorReporter.reportAsync(err);
         }
     }
-    private _isAllowanceSet() {
+    private _isAllowanceSet(): boolean {
         return !this.props.tokenState.allowance.eq(0);
     }
 }
diff --git a/packages/website/ts/components/inputs/balance_bounded_input.tsx b/packages/website/ts/components/inputs/balance_bounded_input.tsx
index e9b8dd369..68b77cfc3 100644
--- a/packages/website/ts/components/inputs/balance_bounded_input.tsx
+++ b/packages/website/ts/components/inputs/balance_bounded_input.tsx
@@ -46,7 +46,7 @@ export class BalanceBoundedInput extends React.Component<BalanceBoundedInputProp
             amountString,
         };
     }
-    public componentWillReceiveProps(nextProps: BalanceBoundedInputProps) {
+    public componentWillReceiveProps(nextProps: BalanceBoundedInputProps): void {
         if (nextProps === this.props) {
             return;
         }
@@ -76,7 +76,7 @@ export class BalanceBoundedInput extends React.Component<BalanceBoundedInputProp
             });
         }
     }
-    public render() {
+    public render(): React.ReactNode {
         let errorText;
         if (this.props.shouldShowErrs) {
             errorText =
@@ -104,7 +104,7 @@ export class BalanceBoundedInput extends React.Component<BalanceBoundedInputProp
             />
         );
     }
-    private _onValueChange(e: any, amountString: string) {
+    private _onValueChange(e: any, amountString: string): void {
         const errMsg = this._validate(amountString, this.props.balance);
         this.setState(
             {
@@ -135,7 +135,7 @@ export class BalanceBoundedInput extends React.Component<BalanceBoundedInputProp
         const errMsg = _.isUndefined(this.props.validate) ? undefined : this.props.validate(amount);
         return errMsg;
     }
-    private _renderIncreaseBalanceLink() {
+    private _renderIncreaseBalanceLink(): React.ReactNode {
         if (this.props.shouldHideVisitBalancesLink) {
             return null;
         }
diff --git a/packages/website/ts/components/inputs/eth_amount_input.tsx b/packages/website/ts/components/inputs/eth_amount_input.tsx
index f3a879065..c3822a80b 100644
--- a/packages/website/ts/components/inputs/eth_amount_input.tsx
+++ b/packages/website/ts/components/inputs/eth_amount_input.tsx
@@ -29,7 +29,7 @@ export class EthAmountInput extends React.Component<EthAmountInputProps, EthAmou
         shouldShowUnderline: true,
         style: { height: 63 },
     };
-    public render() {
+    public render(): React.ReactNode {
         const amount = this.props.amount
             ? ZeroEx.toUnitAmount(this.props.amount, constants.DECIMAL_PLACES_ETH)
             : undefined;
@@ -52,7 +52,7 @@ export class EthAmountInput extends React.Component<EthAmountInputProps, EthAmou
             </div>
         );
     }
-    private _onChange(isValid: boolean, amount?: BigNumber) {
+    private _onChange(isValid: boolean, amount?: BigNumber): void {
         const baseUnitAmountIfExists = _.isUndefined(amount)
             ? undefined
             : ZeroEx.toBaseUnitAmount(amount, constants.DECIMAL_PLACES_ETH);
diff --git a/packages/website/ts/components/inputs/expiration_input.tsx b/packages/website/ts/components/inputs/expiration_input.tsx
index e473648d2..5c68080fe 100644
--- a/packages/website/ts/components/inputs/expiration_input.tsx
+++ b/packages/website/ts/components/inputs/expiration_input.tsx
@@ -30,7 +30,7 @@ export class ExpirationInput extends React.Component<ExpirationInputProps, Expir
             timeMoment: didUserSetExpiry ? expirationMoment : undefined,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const date = this.state.dateMoment ? this.state.dateMoment.toDate() : undefined;
         const time = this.state.timeMoment ? this.state.timeMoment.toDate() : undefined;
         return (
@@ -72,7 +72,7 @@ export class ExpirationInput extends React.Component<ExpirationInputProps, Expir
             .startOf('day')
             .isBefore(this._earliestPickableMoment);
     }
-    private _clearDates() {
+    private _clearDates(): void {
         this.setState({
             dateMoment: undefined,
             timeMoment: undefined,
@@ -80,7 +80,7 @@ export class ExpirationInput extends React.Component<ExpirationInputProps, Expir
         const defaultDateTime = utils.initialOrderExpiryUnixTimestampSec();
         this.props.updateOrderExpiry(defaultDateTime);
     }
-    private _onDateChanged(e: any, date: Date) {
+    private _onDateChanged(e: any, date: Date): void {
         const dateMoment = moment(date);
         this.setState({
             dateMoment,
@@ -88,7 +88,7 @@ export class ExpirationInput extends React.Component<ExpirationInputProps, Expir
         const timestamp = utils.convertToUnixTimestampSeconds(dateMoment, this.state.timeMoment);
         this.props.updateOrderExpiry(timestamp);
     }
-    private _onTimeChanged(e: any, time: Date) {
+    private _onTimeChanged(e: any, time: Date): void {
         const timeMoment = moment(time);
         this.setState({
             timeMoment,
diff --git a/packages/website/ts/components/inputs/hash_input.tsx b/packages/website/ts/components/inputs/hash_input.tsx
index 28305637d..37d4af138 100644
--- a/packages/website/ts/components/inputs/hash_input.tsx
+++ b/packages/website/ts/components/inputs/hash_input.tsx
@@ -27,7 +27,7 @@ interface HashInputProps {
 interface HashInputState {}
 
 export class HashInput extends React.Component<HashInputProps, HashInputState> {
-    public render() {
+    public render(): React.ReactNode {
         const msgHashHex = this.props.blockchainIsLoaded ? this._generateMessageHashHex() : '';
         return (
             <div>
@@ -40,7 +40,7 @@ export class HashInput extends React.Component<HashInputProps, HashInputState> {
             </div>
         );
     }
-    private _generateMessageHashHex() {
+    private _generateMessageHashHex(): string {
         const exchangeContractAddress = this.props.blockchain.getExchangeContractAddressIfExists();
         const hashData = this.props.hashData;
         const order: Order = {
diff --git a/packages/website/ts/components/inputs/identicon_address_input.tsx b/packages/website/ts/components/inputs/identicon_address_input.tsx
index 4cf9af64d..a4dc01ba8 100644
--- a/packages/website/ts/components/inputs/identicon_address_input.tsx
+++ b/packages/website/ts/components/inputs/identicon_address_input.tsx
@@ -23,7 +23,7 @@ export class IdenticonAddressInput extends React.Component<IdenticonAddressInput
             address: props.initialAddress,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const label = this.props.isRequired ? <RequiredLabel label={this.props.label} /> : this.props.label;
         return (
             <div className="relative" style={{ width: '100%' }}>
diff --git a/packages/website/ts/components/inputs/token_amount_input.tsx b/packages/website/ts/components/inputs/token_amount_input.tsx
index 9e638b67b..9a74bdd51 100644
--- a/packages/website/ts/components/inputs/token_amount_input.tsx
+++ b/packages/website/ts/components/inputs/token_amount_input.tsx
@@ -52,14 +52,14 @@ export class TokenAmountInput extends React.Component<TokenAmountInputProps, Tok
             isBalanceAndAllowanceLoaded: false,
         };
     }
-    public componentWillMount() {
+    public componentWillMount(): void {
         // tslint:disable-next-line:no-floating-promises
         this._fetchBalanceAndAllowanceAsync(this.props.token.address, this.props.userAddress);
     }
-    public componentWillUnmount() {
+    public componentWillUnmount(): void {
         this._isUnmounted = true;
     }
-    public componentWillReceiveProps(nextProps: TokenAmountInputProps) {
+    public componentWillReceiveProps(nextProps: TokenAmountInputProps): void {
         if (
             nextProps.userAddress !== this.props.userAddress ||
             nextProps.networkId !== this.props.networkId ||
@@ -70,7 +70,7 @@ export class TokenAmountInput extends React.Component<TokenAmountInputProps, Tok
             this._fetchBalanceAndAllowanceAsync(nextProps.token.address, nextProps.userAddress);
         }
     }
-    public render() {
+    public render(): React.ReactNode {
         const amount = this.props.amount
             ? ZeroEx.toUnitAmount(this.props.amount, this.props.token.decimals)
             : undefined;
@@ -98,7 +98,7 @@ export class TokenAmountInput extends React.Component<TokenAmountInputProps, Tok
             </div>
         );
     }
-    private _onChange(isValid: boolean, amount?: BigNumber) {
+    private _onChange(isValid: boolean, amount?: BigNumber): void {
         let baseUnitAmount;
         if (!_.isUndefined(amount)) {
             baseUnitAmount = ZeroEx.toBaseUnitAmount(amount, this.props.token.decimals);
@@ -122,7 +122,7 @@ export class TokenAmountInput extends React.Component<TokenAmountInputProps, Tok
             return undefined;
         }
     }
-    private async _fetchBalanceAndAllowanceAsync(tokenAddress: string, userAddress: string) {
+    private async _fetchBalanceAndAllowanceAsync(tokenAddress: string, userAddress: string): Promise<void> {
         this.setState({
             isBalanceAndAllowanceLoaded: false,
         });
diff --git a/packages/website/ts/components/inputs/token_input.tsx b/packages/website/ts/components/inputs/token_input.tsx
index 545e9a095..c2c4dd63b 100644
--- a/packages/website/ts/components/inputs/token_input.tsx
+++ b/packages/website/ts/components/inputs/token_input.tsx
@@ -38,7 +38,7 @@ export class TokenInput extends React.Component<TokenInputProps, TokenInputState
             isPickerOpen: false,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const token = this.props.tokenByAddress[this.props.assetToken.address];
         const iconStyles = {
             cursor: 'pointer',
@@ -76,7 +76,7 @@ export class TokenInput extends React.Component<TokenInputProps, TokenInputState
             </div>
         );
     }
-    private _onTokenChosen(tokenAddress: string) {
+    private _onTokenChosen(tokenAddress: string): void {
         const assetToken: AssetToken = {
             address: tokenAddress,
             amount: this.props.assetToken.amount,
@@ -86,12 +86,12 @@ export class TokenInput extends React.Component<TokenInputProps, TokenInputState
             isPickerOpen: false,
         });
     }
-    private _onToggleHover(isHoveringIcon: boolean) {
+    private _onToggleHover(isHoveringIcon: boolean): void {
         this.setState({
             isHoveringIcon,
         });
     }
-    private _onAssetClicked() {
+    private _onAssetClicked(): void {
         if (this.props.blockchainErr !== BlockchainErrs.NoError) {
             this.props.dispatcher.updateShouldBlockchainErrDialogBeOpen(true);
             return;
diff --git a/packages/website/ts/components/legacy_portal/legacy_portal.tsx b/packages/website/ts/components/legacy_portal/legacy_portal.tsx
index c45b20365..002b258fb 100644
--- a/packages/website/ts/components/legacy_portal/legacy_portal.tsx
+++ b/packages/website/ts/components/legacy_portal/legacy_portal.tsx
@@ -79,7 +79,7 @@ export class LegacyPortal extends React.Component<LegacyPortalProps, LegacyPorta
     private _blockchain: Blockchain;
     private _sharedOrderIfExists: Order;
     private _throttledScreenWidthUpdate: () => void;
-    public static hasAlreadyDismissedWethNotice() {
+    public static hasAlreadyDismissedWethNotice(): boolean {
         const didDismissWethNotice = localStorage.getItemIfExists(constants.LOCAL_STORAGE_KEY_DISMISS_WETH_NOTICE);
         const hasAlreadyDismissedWethNotice = !_.isUndefined(didDismissWethNotice) && !_.isEmpty(didDismissWethNotice);
         return hasAlreadyDismissedWethNotice;
@@ -105,14 +105,14 @@ export class LegacyPortal extends React.Component<LegacyPortalProps, LegacyPorta
             isLedgerDialogOpen: false,
         };
     }
-    public componentDidMount() {
+    public componentDidMount(): void {
         window.addEventListener('resize', this._throttledScreenWidthUpdate);
         window.scrollTo(0, 0);
     }
-    public componentWillMount() {
+    public componentWillMount(): void {
         this._blockchain = new Blockchain(this.props.dispatcher);
     }
-    public componentWillUnmount() {
+    public componentWillUnmount(): void {
         this._blockchain.destroy();
         window.removeEventListener('resize', this._throttledScreenWidthUpdate);
         // We re-set the entire redux state when the portal is unmounted so that when it is re-rendered
@@ -121,7 +121,7 @@ export class LegacyPortal extends React.Component<LegacyPortalProps, LegacyPorta
         // become disconnected from their backing Ethereum node, changes user accounts, etc...)
         this.props.dispatcher.resetState();
     }
-    public componentWillReceiveProps(nextProps: LegacyPortalProps) {
+    public componentWillReceiveProps(nextProps: LegacyPortalProps): void {
         if (nextProps.networkId !== this.state.prevNetworkId) {
             // tslint:disable-next-line:no-floating-promises
             this._blockchain.networkIdUpdatedFireAndForgetAsync(nextProps.networkId);
@@ -150,7 +150,7 @@ export class LegacyPortal extends React.Component<LegacyPortalProps, LegacyPorta
             });
         }
     }
-    public render() {
+    public render(): React.ReactNode {
         const updateShouldBlockchainErrDialogBeOpen = this.props.dispatcher.updateShouldBlockchainErrDialogBeOpen.bind(
             this.props.dispatcher,
         );
@@ -276,12 +276,12 @@ export class LegacyPortal extends React.Component<LegacyPortalProps, LegacyPorta
             </div>
         );
     }
-    public onToggleLedgerDialog() {
+    public onToggleLedgerDialog(): void {
         this.setState({
             isLedgerDialogOpen: !this.state.isLedgerDialogOpen,
         });
     }
-    private _renderEthWrapper() {
+    private _renderEthWrapper(): React.ReactNode {
         return (
             <EthWrappers
                 networkId={this.props.networkId}
@@ -294,7 +294,7 @@ export class LegacyPortal extends React.Component<LegacyPortalProps, LegacyPorta
             />
         );
     }
-    private _renderTradeHistory() {
+    private _renderTradeHistory(): React.ReactNode {
         return (
             <TradeHistory
                 tokenByAddress={this.props.tokenByAddress}
@@ -303,7 +303,7 @@ export class LegacyPortal extends React.Component<LegacyPortalProps, LegacyPorta
             />
         );
     }
-    private _renderTokenBalances() {
+    private _renderTokenBalances(): React.ReactNode {
         const allTokens = _.values(this.props.tokenByAddress);
         const trackedTokens = _.filter(allTokens, t => t.isTracked);
         return (
@@ -322,7 +322,7 @@ export class LegacyPortal extends React.Component<LegacyPortalProps, LegacyPorta
             />
         );
     }
-    private _renderFillOrder(match: any, location: Location, history: History) {
+    private _renderFillOrder(match: any, location: Location, history: History): React.ReactNode {
         const initialFillOrder = !_.isUndefined(this.props.userSuppliedOrderCache)
             ? this.props.userSuppliedOrderCache
             : this._sharedOrderIfExists;
@@ -341,7 +341,7 @@ export class LegacyPortal extends React.Component<LegacyPortalProps, LegacyPorta
             />
         );
     }
-    private _renderGenerateOrderForm(match: any, location: Location, history: History) {
+    private _renderGenerateOrderForm(match: any, location: Location, history: History): React.ReactNode {
         return (
             <GenerateOrderForm
                 blockchain={this._blockchain}
@@ -350,13 +350,13 @@ export class LegacyPortal extends React.Component<LegacyPortalProps, LegacyPorta
             />
         );
     }
-    private _onPortalDisclaimerAccepted() {
+    private _onPortalDisclaimerAccepted(): void {
         localStorage.setItem(constants.LOCAL_STORAGE_KEY_ACCEPT_DISCLAIMER, 'set');
         this.setState({
             isDisclaimerDialogOpen: false,
         });
     }
-    private _onWethNoticeAccepted() {
+    private _onWethNoticeAccepted(): void {
         localStorage.setItem(constants.LOCAL_STORAGE_KEY_DISMISS_WETH_NOTICE, 'set');
         this.setState({
             isWethNoticeDialogOpen: false,
@@ -388,7 +388,7 @@ export class LegacyPortal extends React.Component<LegacyPortalProps, LegacyPorta
         }
         return order;
     }
-    private _updateScreenWidth() {
+    private _updateScreenWidth(): void {
         const newScreenWidth = utils.getScreenWidth();
         this.props.dispatcher.updateScreenWidth(newScreenWidth);
     }
diff --git a/packages/website/ts/components/legacy_portal/legacy_portal_menu.tsx b/packages/website/ts/components/legacy_portal/legacy_portal_menu.tsx
index 94113f066..7469ca14e 100644
--- a/packages/website/ts/components/legacy_portal/legacy_portal_menu.tsx
+++ b/packages/website/ts/components/legacy_portal/legacy_portal_menu.tsx
@@ -15,7 +15,7 @@ export class LegacyPortalMenu extends React.Component<LegacyPortalMenuProps, Leg
     public static defaultProps: Partial<LegacyPortalMenuProps> = {
         onClick: _.noop,
     };
-    public render() {
+    public render(): React.ReactNode {
         return (
             <div>
                 <MenuItem
@@ -61,7 +61,7 @@ export class LegacyPortalMenu extends React.Component<LegacyPortalMenuProps, Leg
             </div>
         );
     }
-    private _renderMenuItemWithIcon(title: string, iconName: string) {
+    private _renderMenuItemWithIcon(title: string, iconName: string): React.ReactNode {
         return (
             <div className="flex" style={{ fontWeight: 100 }}>
                 <div className="pr1 pl2">
diff --git a/packages/website/ts/components/order_json.tsx b/packages/website/ts/components/order_json.tsx
index 02b88b888..6feefea50 100644
--- a/packages/website/ts/components/order_json.tsx
+++ b/packages/website/ts/components/order_json.tsx
@@ -38,7 +38,7 @@ export class OrderJSON extends React.Component<OrderJSONProps, OrderJSONState> {
         // tslint:disable-next-line:no-floating-promises
         this._setShareLinkAsync();
     }
-    public render() {
+    public render(): React.ReactNode {
         const order = utils.generateOrder(
             this.props.exchangeContractIfExists,
             this.props.sideToAssetToken,
@@ -116,11 +116,11 @@ export class OrderJSON extends React.Component<OrderJSONProps, OrderJSONState> {
             </div>
         );
     }
-    private async _shareViaTwitterAsync() {
+    private _shareViaTwitterAsync(): void {
         const tweetText = encodeURIComponent(`Fill my order using the 0x protocol: ${this.state.shareLink}`);
         window.open(`https://twitter.com/intent/tweet?text=${tweetText}`, 'Share your order', 'width=500,height=400');
     }
-    private async _shareViaFacebook() {
+    private _shareViaFacebook(): void {
         (window as any).FB.ui(
             {
                 display: 'popup',
@@ -130,14 +130,14 @@ export class OrderJSON extends React.Component<OrderJSONProps, OrderJSONState> {
             _.noop,
         );
     }
-    private async _shareViaEmailAsync() {
+    private _shareViaEmailAsync(): void {
         const encodedSubject = encodeURIComponent("Let's trade using the 0x protocol");
         const encodedBody = encodeURIComponent(`I generated an order with the 0x protocol.
 You can see and fill it here: ${this.state.shareLink}`);
         const mailToLink = `mailto:mail@example.org?subject=${encodedSubject}&body=${encodedBody}`;
         window.open(mailToLink, '_blank');
     }
-    private async _setShareLinkAsync() {
+    private async _setShareLinkAsync(): Promise<void> {
         const shareLink = await this._generateShareLinkAsync();
         this.setState({
             shareLink,
@@ -159,7 +159,7 @@ You can see and fill it here: ${this.state.shareLink}`);
         }
         return bodyObj.data.url;
     }
-    private _getOrderUrl() {
+    private _getOrderUrl(): string {
         const order = utils.generateOrder(
             this.props.exchangeContractIfExists,
             this.props.sideToAssetToken,
diff --git a/packages/website/ts/components/portal/portal.tsx b/packages/website/ts/components/portal/portal.tsx
index 4cbc65ce4..e572b7911 100644
--- a/packages/website/ts/components/portal/portal.tsx
+++ b/packages/website/ts/components/portal/portal.tsx
@@ -102,14 +102,14 @@ export class Portal extends React.Component<PortalProps, PortalState> {
             isLedgerDialogOpen: false,
         };
     }
-    public componentDidMount() {
+    public componentDidMount(): void {
         window.addEventListener('resize', this._throttledScreenWidthUpdate);
         window.scrollTo(0, 0);
     }
-    public componentWillMount() {
+    public componentWillMount(): void {
         this._blockchain = new Blockchain(this.props.dispatcher);
     }
-    public componentWillUnmount() {
+    public componentWillUnmount(): void {
         this._blockchain.destroy();
         window.removeEventListener('resize', this._throttledScreenWidthUpdate);
         // We re-set the entire redux state when the portal is unmounted so that when it is re-rendered
@@ -118,7 +118,7 @@ export class Portal extends React.Component<PortalProps, PortalState> {
         // become disconnected from their backing Ethereum node, changed user accounts, etc...)
         this.props.dispatcher.resetState();
     }
-    public componentWillReceiveProps(nextProps: PortalProps) {
+    public componentWillReceiveProps(nextProps: PortalProps): void {
         if (nextProps.networkId !== this.state.prevNetworkId) {
             // tslint:disable-next-line:no-floating-promises
             this._blockchain.networkIdUpdatedFireAndForgetAsync(nextProps.networkId);
@@ -144,7 +144,7 @@ export class Portal extends React.Component<PortalProps, PortalState> {
             });
         }
     }
-    public render() {
+    public render(): React.ReactNode {
         const updateShouldBlockchainErrDialogBeOpen = this.props.dispatcher.updateShouldBlockchainErrDialogBeOpen.bind(
             this.props.dispatcher,
         );
@@ -241,7 +241,7 @@ export class Portal extends React.Component<PortalProps, PortalState> {
             </div>
         );
     }
-    private _onTokenChosen(tokenAddress: string) {
+    private _onTokenChosen(tokenAddress: string): void {
         if (_.isEmpty(tokenAddress)) {
             this.setState({
                 tokenManagementState: TokenManagementState.None,
@@ -269,28 +269,28 @@ export class Portal extends React.Component<PortalProps, PortalState> {
             tokenManagementState: TokenManagementState.None,
         });
     }
-    private _onToggleLedgerDialog() {
+    private _onToggleLedgerDialog(): void {
         this.setState({
             isLedgerDialogOpen: !this.state.isLedgerDialogOpen,
         });
     }
-    private _onAddToken() {
+    private _onAddToken(): void {
         this.setState({
             tokenManagementState: TokenManagementState.Add,
         });
     }
-    private _onRemoveToken() {
+    private _onRemoveToken(): void {
         this.setState({
             tokenManagementState: TokenManagementState.Remove,
         });
     }
-    private _onPortalDisclaimerAccepted() {
+    private _onPortalDisclaimerAccepted(): void {
         localStorage.setItem(constants.LOCAL_STORAGE_KEY_ACCEPT_DISCLAIMER, 'set');
         this.setState({
             isDisclaimerDialogOpen: false,
         });
     }
-    private _updateScreenWidth() {
+    private _updateScreenWidth(): void {
         const newScreenWidth = utils.getScreenWidth();
         this.props.dispatcher.updateScreenWidth(newScreenWidth);
     }
diff --git a/packages/website/ts/components/redirecter.tsx b/packages/website/ts/components/redirecter.tsx
index 2e705af58..629522bbb 100644
--- a/packages/website/ts/components/redirecter.tsx
+++ b/packages/website/ts/components/redirecter.tsx
@@ -5,6 +5,6 @@ interface RedirecterProps {
     location: string;
 }
 
-export function Redirecter(props: RedirecterProps) {
+export function Redirecter(props: RedirecterProps): void {
     window.location.href = constants.URL_ANGELLIST;
 }
diff --git a/packages/website/ts/components/relayer_index/relayer_grid_tile.tsx b/packages/website/ts/components/relayer_index/relayer_grid_tile.tsx
index d88a59d15..592bff29f 100644
--- a/packages/website/ts/components/relayer_index/relayer_grid_tile.tsx
+++ b/packages/website/ts/components/relayer_index/relayer_grid_tile.tsx
@@ -109,14 +109,14 @@ class ImgWithFallback extends React.Component<ImgWithFallbackProps, ImgWithFallb
             imageLoadFailed: false,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         if (this.state.imageLoadFailed || _.isUndefined(this.props.src)) {
             return <img src={this.props.fallbackSrc} style={this.props.style} />;
         } else {
             return <img src={this.props.src} onError={this._onError.bind(this)} style={this.props.style} />;
         }
     }
-    private _onError() {
+    private _onError(): void {
         this.setState({
             imageLoadFailed: true,
         });
diff --git a/packages/website/ts/components/relayer_index/relayer_index.tsx b/packages/website/ts/components/relayer_index/relayer_index.tsx
index dffd0f83f..d4fd6aeaf 100644
--- a/packages/website/ts/components/relayer_index/relayer_index.tsx
+++ b/packages/website/ts/components/relayer_index/relayer_index.tsx
@@ -48,14 +48,14 @@ export class RelayerIndex extends React.Component<RelayerIndexProps, RelayerInde
             error: undefined,
         };
     }
-    public componentWillMount() {
+    public componentWillMount(): void {
         // tslint:disable-next-line:no-floating-promises
         this._fetchRelayerInfosAsync();
     }
-    public componentWillUnmount() {
+    public componentWillUnmount(): void {
         this._isUnmounted = true;
     }
-    public render() {
+    public render(): React.ReactNode {
         const readyToRender = _.isUndefined(this.state.error) && !_.isUndefined(this.state.relayerInfos);
         if (!readyToRender) {
             return (
diff --git a/packages/website/ts/components/relayer_index/relayer_top_tokens.tsx b/packages/website/ts/components/relayer_index/relayer_top_tokens.tsx
index db4d3a211..468a350e4 100644
--- a/packages/website/ts/components/relayer_index/relayer_top_tokens.tsx
+++ b/packages/website/ts/components/relayer_index/relayer_top_tokens.tsx
@@ -41,6 +41,6 @@ export const TopTokens: React.StatelessComponent<TopTokensProps> = (props: TopTo
     );
 };
 
-function tokenLinkFromToken(tokenInfo: WebsiteBackendTokenInfo, networkId: number) {
+function tokenLinkFromToken(tokenInfo: WebsiteBackendTokenInfo, networkId: number): string {
     return sharedUtils.getEtherScanLinkIfExists(tokenInfo.address, networkId, EtherscanLinkSuffixes.Address);
 }
diff --git a/packages/website/ts/components/send_button.tsx b/packages/website/ts/components/send_button.tsx
index 79c103e05..8486dbd8b 100644
--- a/packages/website/ts/components/send_button.tsx
+++ b/packages/website/ts/components/send_button.tsx
@@ -33,7 +33,7 @@ export class SendButton extends React.Component<SendButtonProps, SendButtonState
             isSending: false,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const labelStyle = this.state.isSending ? { fontSize: 10 } : {};
         return (
             <div>
@@ -57,12 +57,12 @@ export class SendButton extends React.Component<SendButtonProps, SendButtonState
             </div>
         );
     }
-    private _toggleSendDialog() {
+    private _toggleSendDialog(): void {
         this.setState({
             isSendDialogVisible: !this.state.isSendDialogVisible,
         });
     }
-    private async _onSendAmountSelectedAsync(recipient: string, value: BigNumber) {
+    private async _onSendAmountSelectedAsync(recipient: string, value: BigNumber): Promise<void> {
         this.setState({
             isSending: true,
         });
diff --git a/packages/website/ts/components/sidebar_header.tsx b/packages/website/ts/components/sidebar_header.tsx
index a0ea869fb..bf46caad9 100644
--- a/packages/website/ts/components/sidebar_header.tsx
+++ b/packages/website/ts/components/sidebar_header.tsx
@@ -12,7 +12,7 @@ interface SidebarHeaderProps {
 interface SidebarHeaderState {}
 
 export class SidebarHeader extends React.Component<SidebarHeaderProps, SidebarHeaderState> {
-    public render() {
+    public render(): React.ReactNode {
         return (
             <div className="pt2 md-px1 sm-px2" style={{ color: colors.black, paddingBottom: 18 }}>
                 <div className="flex" style={{ fontSize: 25 }}>
diff --git a/packages/website/ts/components/token_balances.tsx b/packages/website/ts/components/token_balances.tsx
index 618b5fe8f..83948e5c2 100644
--- a/packages/website/ts/components/token_balances.tsx
+++ b/packages/website/ts/components/token_balances.tsx
@@ -99,15 +99,15 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
             trackedTokenStateByAddress: initialTrackedTokenStateByAddress,
         };
     }
-    public componentWillMount() {
+    public componentWillMount(): void {
         const trackedTokenAddresses = _.keys(this.state.trackedTokenStateByAddress);
         // tslint:disable-next-line:no-floating-promises
         this._fetchBalancesAndAllowancesAsync(trackedTokenAddresses);
     }
-    public componentWillUnmount() {
+    public componentWillUnmount(): void {
         this._isUnmounted = true;
     }
-    public componentWillReceiveProps(nextProps: TokenBalancesProps) {
+    public componentWillReceiveProps(nextProps: TokenBalancesProps): void {
         if (nextProps.userEtherBalanceInWei !== this.props.userEtherBalanceInWei) {
             if (this.state.isBalanceSpinnerVisible) {
                 const receivedAmountInWei = nextProps.userEtherBalanceInWei.minus(this.props.userEtherBalanceInWei);
@@ -153,10 +153,10 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
             this._fetchBalancesAndAllowancesAsync(newTokenAddresses);
         }
     }
-    public componentDidMount() {
+    public componentDidMount(): void {
         window.scrollTo(0, 0);
     }
-    public render() {
+    public render(): React.ReactNode {
         const errorDialogActions = [
             <FlatButton
                 key="errorOkBtn"
@@ -294,7 +294,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
             </div>
         );
     }
-    private _renderTokenTableRows() {
+    private _renderTokenTableRows(): React.ReactNode {
         if (!this.props.blockchainIsLoaded || this.props.blockchainErr !== BlockchainErrs.NoError) {
             return '';
         }
@@ -313,7 +313,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
         );
         return tableRows;
     }
-    private _renderTokenRow(tokenColSpan: number, actionPaddingX: number, token: Token) {
+    private _renderTokenRow(tokenColSpan: number, actionPaddingX: number, token: Token): React.ReactNode {
         const tokenState = this.state.trackedTokenStateByAddress[token.address];
         const tokenLink = sharedUtils.getEtherScanLinkIfExists(
             token.address,
@@ -411,7 +411,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
             </TableRow>
         );
     }
-    private _onAssetTokenPicked(tokenAddress: string) {
+    private _onAssetTokenPicked(tokenAddress: string): void {
         if (_.isEmpty(tokenAddress)) {
             this.setState({
                 isTokenPickerOpen: false,
@@ -439,16 +439,16 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
             isTokenPickerOpen: false,
         });
     }
-    private _onSendFailed() {
+    private _onSendFailed(): void {
         this.setState({
             errorType: BalanceErrs.sendFailed,
         });
     }
-    private _renderAmount(amount: BigNumber, decimals: number) {
+    private _renderAmount(amount: BigNumber, decimals: number): React.ReactNode {
         const unitAmount = ZeroEx.toUnitAmount(amount, decimals);
         return unitAmount.toNumber().toFixed(configs.AMOUNT_DISPLAY_PRECSION);
     }
-    private _renderTokenName(token: Token) {
+    private _renderTokenName(token: Token): React.ReactNode {
         const tooltipId = `tooltip-${token.address}`;
         return (
             <div className="flex">
@@ -460,7 +460,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
             </div>
         );
     }
-    private _renderErrorDialogBody() {
+    private _renderErrorDialogBody(): React.ReactNode {
         switch (this.state.errorType) {
             case BalanceErrs.incorrectNetworkForFaucet:
                 return (
@@ -499,7 +499,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
                 throw utils.spawnSwitchErr('errorType', this.state.errorType);
         }
     }
-    private _onErrorOccurred(errorType: BalanceErrs) {
+    private _onErrorOccurred(errorType: BalanceErrs): void {
         this.setState({
             errorType,
         });
@@ -577,24 +577,24 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
         }
         return true;
     }
-    private _onErrorDialogToggle(isOpen: boolean) {
+    private _onErrorDialogToggle(isOpen: boolean): void {
         this.setState({
             errorType: undefined,
         });
     }
-    private _onAddTokenClicked() {
+    private _onAddTokenClicked(): void {
         this.setState({
             isTokenPickerOpen: true,
             isAddingToken: true,
         });
     }
-    private _onRemoveTokenClicked() {
+    private _onRemoveTokenClicked(): void {
         this.setState({
             isTokenPickerOpen: true,
             isAddingToken: false,
         });
     }
-    private async _startPollingZrxBalanceAsync() {
+    private async _startPollingZrxBalanceAsync(): Promise<void> {
         const tokens = _.values(this.props.tokenByAddress);
         const zrxToken = _.find(tokens, t => t.symbol === ZRX_TOKEN_SYMBOL);
 
@@ -609,7 +609,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
             isZRXSpinnerVisible: false,
         });
     }
-    private async _fetchBalancesAndAllowancesAsync(tokenAddresses: string[]) {
+    private async _fetchBalancesAndAllowancesAsync(tokenAddresses: string[]): Promise<void> {
         const trackedTokenStateByAddress = this.state.trackedTokenStateByAddress;
         const userAddressIfExists = _.isEmpty(this.props.userAddress) ? undefined : this.props.userAddress;
         for (const tokenAddress of tokenAddresses) {
@@ -629,7 +629,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
             });
         }
     }
-    private _getInitialTrackedTokenStateByAddress(trackedTokens: Token[]) {
+    private _getInitialTrackedTokenStateByAddress(trackedTokens: Token[]): TokenStateByAddress {
         const trackedTokenStateByAddress: TokenStateByAddress = {};
         _.each(trackedTokens, token => {
             trackedTokenStateByAddress[token.address] = {
@@ -640,7 +640,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
         });
         return trackedTokenStateByAddress;
     }
-    private async _refetchTokenStateAsync(tokenAddress: string) {
+    private async _refetchTokenStateAsync(tokenAddress: string): Promise<void> {
         const userAddressIfExists = _.isEmpty(this.props.userAddress) ? undefined : this.props.userAddress;
         const [balance, allowance] = await this.props.blockchain.getTokenBalanceAndAllowanceAsync(
             userAddressIfExists,
diff --git a/packages/website/ts/components/top_bar/provider_display.tsx b/packages/website/ts/components/top_bar/provider_display.tsx
index 4cd50dba9..9d8bd6913 100644
--- a/packages/website/ts/components/top_bar/provider_display.tsx
+++ b/packages/website/ts/components/top_bar/provider_display.tsx
@@ -35,7 +35,7 @@ const styles: Styles = {
 };
 
 export class ProviderDisplay extends React.Component<ProviderDisplayProps, ProviderDisplayState> {
-    public render() {
+    public render(): React.ReactNode {
         const isAddressAvailable = !_.isEmpty(this.props.userAddress);
         const isExternallyInjectedProvider =
             this.props.providerType === ProviderType.Injected && this.props.injectedProviderName !== '0x Public';
@@ -81,7 +81,7 @@ export class ProviderDisplay extends React.Component<ProviderDisplayProps, Provi
             </div>
         );
     }
-    public renderPopoverContent(hasInjectedProvider: boolean, hasLedgerProvider: boolean) {
+    public renderPopoverContent(hasInjectedProvider: boolean, hasLedgerProvider: boolean): React.ReactNode {
         if (hasInjectedProvider || hasLedgerProvider) {
             return (
                 <ProviderPicker
diff --git a/packages/website/ts/components/top_bar/provider_picker.tsx b/packages/website/ts/components/top_bar/provider_picker.tsx
index b986da873..1ecb8389c 100644
--- a/packages/website/ts/components/top_bar/provider_picker.tsx
+++ b/packages/website/ts/components/top_bar/provider_picker.tsx
@@ -19,7 +19,7 @@ interface ProviderPickerProps {
 interface ProviderPickerState {}
 
 export class ProviderPicker extends React.Component<ProviderPickerProps, ProviderPickerState> {
-    public render() {
+    public render(): React.ReactNode {
         const isLedgerSelected = this.props.providerType === ProviderType.Ledger;
         const menuStyle = {
             padding: 10,
@@ -46,7 +46,7 @@ export class ProviderPicker extends React.Component<ProviderPickerProps, Provide
             </div>
         );
     }
-    private _renderLabel(title: string, shouldShowNetwork: boolean) {
+    private _renderLabel(title: string, shouldShowNetwork: boolean): React.ReactNode {
         const label = (
             <div className="flex">
                 <div style={{ fontSize: 14 }}>{title}</div>
@@ -55,7 +55,7 @@ export class ProviderPicker extends React.Component<ProviderPickerProps, Provide
         );
         return label;
     }
-    private _renderNetwork() {
+    private _renderNetwork(): React.ReactNode {
         const networkName = sharedConstants.NETWORK_NAME_BY_ID[this.props.networkId];
         return (
             <div className="flex" style={{ marginTop: 1 }}>
@@ -70,7 +70,7 @@ export class ProviderPicker extends React.Component<ProviderPickerProps, Provide
             </div>
         );
     }
-    private _onProviderRadioChanged(value: string) {
+    private _onProviderRadioChanged(value: string): void {
         if (value === ProviderType.Ledger) {
             this.props.onToggleLedgerDialog();
         } else {
diff --git a/packages/website/ts/components/top_bar/top_bar.tsx b/packages/website/ts/components/top_bar/top_bar.tsx
index 5a1b50310..5fde007d6 100644
--- a/packages/website/ts/components/top_bar/top_bar.tsx
+++ b/packages/website/ts/components/top_bar/top_bar.tsx
@@ -83,7 +83,7 @@ export class TopBar extends React.Component<TopBarProps, TopBarState> {
         style: {},
         isNightVersion: false,
     };
-    public static heightForDisplayType(displayType: TopBarDisplayType) {
+    public static heightForDisplayType(displayType: TopBarDisplayType): number {
         const result = displayType === TopBarDisplayType.Expanded ? EXPANDED_HEIGHT : DEFAULT_HEIGHT;
         return result + 1;
     }
@@ -93,7 +93,7 @@ export class TopBar extends React.Component<TopBarProps, TopBarState> {
             isDrawerOpen: false,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const isNightVersion = this.props.isNightVersion;
         const isExpandedDisplayType = this.props.displayType === TopBarDisplayType.Expanded;
         const parentClassNames = `flex mx-auto ${isExpandedDisplayType ? 'pl3 py1' : 'max-width-4'}`;
@@ -278,7 +278,7 @@ export class TopBar extends React.Component<TopBarProps, TopBarState> {
             </div>
         );
     }
-    private _renderDrawer() {
+    private _renderDrawer(): React.ReactNode {
         return (
             <Drawer
                 open={this.state.isDrawerOpen}
@@ -447,51 +447,51 @@ export class TopBar extends React.Component<TopBarProps, TopBarState> {
             </div>
         );
     }
-    private _onMenuButtonClick() {
+    private _onMenuButtonClick(): void {
         this.setState({
             isDrawerOpen: !this.state.isDrawerOpen,
         });
     }
-    private _isViewingPortal() {
+    private _isViewingPortal(): boolean {
         return _.includes(this.props.location.pathname, WebsitePaths.Portal);
     }
-    private _isViewingFAQ() {
+    private _isViewingFAQ(): boolean {
         return _.includes(this.props.location.pathname, WebsitePaths.FAQ);
     }
-    private _isViewing0xjsDocs() {
+    private _isViewing0xjsDocs(): boolean {
         return (
             _.includes(this.props.location.pathname, WebsitePaths.ZeroExJs) ||
             _.includes(this.props.location.pathname, WebsiteLegacyPaths.ZeroExJs)
         );
     }
-    private _isViewingConnectDocs() {
+    private _isViewingConnectDocs(): boolean {
         return _.includes(this.props.location.pathname, WebsitePaths.Connect);
     }
-    private _isViewingSmartContractsDocs() {
+    private _isViewingSmartContractsDocs(): boolean {
         return _.includes(this.props.location.pathname, WebsitePaths.SmartContracts);
     }
-    private _isViewingWeb3WrapperDocs() {
+    private _isViewingWeb3WrapperDocs(): boolean {
         return (
             _.includes(this.props.location.pathname, WebsitePaths.Web3Wrapper) ||
             _.includes(this.props.location.pathname, WebsiteLegacyPaths.Web3Wrapper)
         );
     }
-    private _isViewingSolCompilerDocs() {
+    private _isViewingSolCompilerDocs(): boolean {
         return _.includes(this.props.location.pathname, WebsitePaths.SolCompiler);
     }
-    private _isViewingJsonSchemasDocs() {
+    private _isViewingJsonSchemasDocs(): boolean {
         return _.includes(this.props.location.pathname, WebsitePaths.JSONSchemas);
     }
-    private _isViewingSolCovDocs() {
+    private _isViewingSolCovDocs(): boolean {
         return _.includes(this.props.location.pathname, WebsitePaths.SolCov);
     }
-    private _isViewingSubprovidersDocs() {
+    private _isViewingSubprovidersDocs(): boolean {
         return _.includes(this.props.location.pathname, WebsitePaths.Subproviders);
     }
-    private _isViewingWiki() {
+    private _isViewingWiki(): boolean {
         return _.includes(this.props.location.pathname, WebsitePaths.Wiki);
     }
-    private _shouldDisplayBottomBar() {
+    private _shouldDisplayBottomBar(): boolean {
         return (
             this._isViewingWiki() ||
             this._isViewing0xjsDocs() ||
diff --git a/packages/website/ts/components/top_bar/top_bar_menu_item.tsx b/packages/website/ts/components/top_bar/top_bar_menu_item.tsx
index c0e674b17..2e4254cfa 100644
--- a/packages/website/ts/components/top_bar/top_bar_menu_item.tsx
+++ b/packages/website/ts/components/top_bar/top_bar_menu_item.tsx
@@ -26,7 +26,7 @@ export class TopBarMenuItem extends React.Component<TopBarMenuItemProps, TopBarM
         className: '',
         isNightVersion: false,
     };
-    public render() {
+    public render(): React.ReactNode {
         const primaryStyles = this.props.isPrimary
             ? {
                   borderRadius: 4,
diff --git a/packages/website/ts/components/track_token_confirmation.tsx b/packages/website/ts/components/track_token_confirmation.tsx
index 8c5ba7e6f..294fb8590 100644
--- a/packages/website/ts/components/track_token_confirmation.tsx
+++ b/packages/website/ts/components/track_token_confirmation.tsx
@@ -15,7 +15,7 @@ interface TrackTokenConfirmationProps {
 interface TrackTokenConfirmationState {}
 
 export class TrackTokenConfirmation extends React.Component<TrackTokenConfirmationProps, TrackTokenConfirmationState> {
-    public render() {
+    public render(): React.ReactNode {
         const isMultipleTokens = this.props.tokens.length > 1;
         const allTokens = _.values(this.props.tokenByAddress);
         return (
diff --git a/packages/website/ts/components/trade_history/trade_history.tsx b/packages/website/ts/components/trade_history/trade_history.tsx
index 635358627..1ca9d866f 100644
--- a/packages/website/ts/components/trade_history/trade_history.tsx
+++ b/packages/website/ts/components/trade_history/trade_history.tsx
@@ -28,16 +28,16 @@ export class TradeHistory extends React.Component<TradeHistoryProps, TradeHistor
             sortedFills,
         };
     }
-    public componentWillMount() {
+    public componentWillMount(): void {
         this._startPollingForFills();
     }
-    public componentWillUnmount() {
+    public componentWillUnmount(): void {
         this._stopPollingForFills();
     }
-    public componentDidMount() {
+    public componentDidMount(): void {
         window.scrollTo(0, 0);
     }
-    public render() {
+    public render(): React.ReactNode {
         return (
             <div className="lg-px4 md-px4 sm-px2">
                 <h3>Trade history</h3>
@@ -48,7 +48,7 @@ export class TradeHistory extends React.Component<TradeHistoryProps, TradeHistor
             </div>
         );
     }
-    private _renderTrades() {
+    private _renderTrades(): React.ReactNode {
         const numNonCustomFills = this._numFillsWithoutCustomERC20Tokens();
         if (numNonCustomFills === 0) {
             return this._renderEmptyNotice();
@@ -66,14 +66,14 @@ export class TradeHistory extends React.Component<TradeHistoryProps, TradeHistor
             );
         });
     }
-    private _renderEmptyNotice() {
+    private _renderEmptyNotice(): React.ReactNode {
         return (
             <Paper className="mt1 p2 mx-auto center" style={{ width: '80%' }}>
                 No filled orders yet.
             </Paper>
         );
     }
-    private _numFillsWithoutCustomERC20Tokens() {
+    private _numFillsWithoutCustomERC20Tokens(): number {
         let numNonCustomFills = 0;
         const tokens = _.values(this.props.tokenByAddress);
         _.each(this.state.sortedFills, fill => {
@@ -93,7 +93,7 @@ export class TradeHistory extends React.Component<TradeHistoryProps, TradeHistor
         });
         return numNonCustomFills;
     }
-    private _startPollingForFills() {
+    private _startPollingForFills(): void {
         this._fillPollingIntervalId = window.setInterval(() => {
             const sortedFills = this._getSortedFills();
             if (!utils.deepEqual(sortedFills, this.state.sortedFills)) {
@@ -103,10 +103,10 @@ export class TradeHistory extends React.Component<TradeHistoryProps, TradeHistor
             }
         }, FILL_POLLING_INTERVAL);
     }
-    private _stopPollingForFills() {
+    private _stopPollingForFills(): void {
         clearInterval(this._fillPollingIntervalId);
     }
-    private _getSortedFills() {
+    private _getSortedFills(): Fill[] {
         const fillsByHash = tradeHistoryStorage.getUserFillsByHash(this.props.userAddress, this.props.networkId);
         const fills = _.values(fillsByHash);
         const sortedFills = _.sortBy(fills, [(fill: Fill) => fill.blockTimestamp * -1]);
diff --git a/packages/website/ts/components/trade_history/trade_history_item.tsx b/packages/website/ts/components/trade_history/trade_history_item.tsx
index dbe72259b..adca4d58c 100644
--- a/packages/website/ts/components/trade_history/trade_history_item.tsx
+++ b/packages/website/ts/components/trade_history/trade_history_item.tsx
@@ -23,7 +23,7 @@ interface TradeHistoryItemProps {
 interface TradeHistoryItemState {}
 
 export class TradeHistoryItem extends React.Component<TradeHistoryItemProps, TradeHistoryItemState> {
-    public render() {
+    public render(): React.ReactNode {
         const fill = this.props.fill;
         const tokens = _.values(this.props.tokenByAddress);
         const takerToken = _.find(tokens, token => {
@@ -88,7 +88,7 @@ export class TradeHistoryItem extends React.Component<TradeHistoryItemProps, Tra
             </Paper>
         );
     }
-    private _renderAmounts(makerToken: Token, takerToken: Token) {
+    private _renderAmounts(makerToken: Token, takerToken: Token): React.ReactNode {
         const fill = this.props.fill;
         const filledTakerTokenAmountInUnits = ZeroEx.toUnitAmount(fill.filledTakerTokenAmount, takerToken.decimals);
         const filledMakerTokenAmountInUnits = ZeroEx.toUnitAmount(fill.filledMakerTokenAmount, takerToken.decimals);
@@ -136,7 +136,7 @@ export class TradeHistoryItem extends React.Component<TradeHistoryItemProps, Tra
             </div>
         );
     }
-    private _renderDate() {
+    private _renderDate(): React.ReactNode {
         const blockMoment = moment.unix(this.props.fill.blockTimestamp);
         if (!blockMoment.isValid()) {
             return null;
@@ -159,7 +159,7 @@ export class TradeHistoryItem extends React.Component<TradeHistoryItemProps, Tra
             </div>
         );
     }
-    private _renderAmount(amount: BigNumber, symbol: string, decimals: number) {
+    private _renderAmount(amount: BigNumber, symbol: string, decimals: number): React.ReactNode {
         const unitAmount = ZeroEx.toUnitAmount(amount, decimals);
         return (
             <span>
diff --git a/packages/website/ts/components/ui/alert.tsx b/packages/website/ts/components/ui/alert.tsx
index f81939255..b571d8c1c 100644
--- a/packages/website/ts/components/ui/alert.tsx
+++ b/packages/website/ts/components/ui/alert.tsx
@@ -7,7 +7,7 @@ interface AlertProps {
     message: string | React.ReactNode;
 }
 
-export function Alert(props: AlertProps) {
+export const Alert = (props: AlertProps) => {
     const isAlert = props.type === AlertTypes.ERROR;
     const errMsgStyles = {
         background: isAlert ? colors.red200 : colors.lightestGreen,
@@ -22,4 +22,4 @@ export function Alert(props: AlertProps) {
             {props.message}
         </div>
     );
-}
+};
diff --git a/packages/website/ts/components/ui/copy_icon.tsx b/packages/website/ts/components/ui/copy_icon.tsx
index d58e50815..2c2941067 100644
--- a/packages/website/ts/components/ui/copy_icon.tsx
+++ b/packages/website/ts/components/ui/copy_icon.tsx
@@ -23,14 +23,14 @@ export class CopyIcon extends React.Component<CopyIconProps, CopyIconState> {
             isHovering: false,
         };
     }
-    public componentDidUpdate() {
+    public componentDidUpdate(): void {
         // Remove tooltip if hover away
         if (!this.state.isHovering && this._copyTooltipTimeoutId) {
             clearInterval(this._copyTooltipTimeoutId);
             this._hideTooltip();
         }
     }
-    public render() {
+    public render(): React.ReactNode {
         return (
             <div className="inline-block">
                 <CopyToClipboard text={this.props.data} onCopy={this._onCopy.bind(this)}>
@@ -55,15 +55,15 @@ export class CopyIcon extends React.Component<CopyIconProps, CopyIconState> {
             </div>
         );
     }
-    private _setRefToProperty(el: HTMLInputElement) {
+    private _setRefToProperty(el: HTMLInputElement): void {
         this._copyable = el;
     }
-    private _setHoverState(isHovering: boolean) {
+    private _setHoverState(isHovering: boolean): void {
         this.setState({
             isHovering,
         });
     }
-    private _onCopy() {
+    private _onCopy(): void {
         if (this._copyTooltipTimeoutId) {
             clearInterval(this._copyTooltipTimeoutId);
         }
@@ -73,7 +73,7 @@ export class CopyIcon extends React.Component<CopyIconProps, CopyIconState> {
             this._hideTooltip();
         }, tooltipLifespanMs);
     }
-    private _hideTooltip() {
+    private _hideTooltip(): void {
         ReactTooltip.hide(ReactDOM.findDOMNode(this._copyable));
     }
 }
diff --git a/packages/website/ts/components/ui/drop_down.tsx b/packages/website/ts/components/ui/drop_down.tsx
index 63b9eec0b..98a495581 100644
--- a/packages/website/ts/components/ui/drop_down.tsx
+++ b/packages/website/ts/components/ui/drop_down.tsx
@@ -35,15 +35,15 @@ export class DropDown extends React.Component<DropDownProps, DropDownState> {
             isDropDownOpen: false,
         };
     }
-    public componentDidMount() {
+    public componentDidMount(): void {
         this._popoverCloseCheckIntervalId = window.setInterval(() => {
             this._checkIfShouldClosePopover();
         }, CHECK_CLOSE_POPOVER_INTERVAL_MS);
     }
-    public componentWillUnmount() {
+    public componentWillUnmount(): void {
         window.clearInterval(this._popoverCloseCheckIntervalId);
     }
-    public componentWillReceiveProps(nextProps: DropDownProps) {
+    public componentWillReceiveProps(nextProps: DropDownProps): void {
         // HACK: If the popoverContent is updated to a different dimension and the users
         // mouse is no longer above it, the dropdown can enter an inconsistent state where
         // it believes the user is still hovering over it. In order to remedy this, we
@@ -52,7 +52,7 @@ export class DropDown extends React.Component<DropDownProps, DropDownState> {
         // dropdowns from having dynamic content.
         this._onHoverOff();
     }
-    public render() {
+    public render(): React.ReactNode {
         return (
             <div
                 style={{ ...this.props.style, width: 'fit-content', height: '100%' }}
@@ -77,11 +77,11 @@ export class DropDown extends React.Component<DropDownProps, DropDownState> {
             </div>
         );
     }
-    private _onHover(event: React.FormEvent<HTMLInputElement>) {
+    private _onHover(event: React.FormEvent<HTMLInputElement>): void {
         this._isHovering = true;
         this._checkIfShouldOpenPopover(event);
     }
-    private _checkIfShouldOpenPopover(event: React.FormEvent<HTMLInputElement>) {
+    private _checkIfShouldOpenPopover(event: React.FormEvent<HTMLInputElement>): void {
         if (this.state.isDropDownOpen) {
             return; // noop
         }
@@ -91,16 +91,16 @@ export class DropDown extends React.Component<DropDownProps, DropDownState> {
             anchorEl: event.currentTarget,
         });
     }
-    private _onHoverOff() {
+    private _onHoverOff(): void {
         this._isHovering = false;
     }
-    private _checkIfShouldClosePopover() {
+    private _checkIfShouldClosePopover(): void {
         if (!this.state.isDropDownOpen || this._isHovering) {
             return; // noop
         }
         this._closePopover();
     }
-    private _closePopover() {
+    private _closePopover(): void {
         this.setState({
             isDropDownOpen: false,
         });
diff --git a/packages/website/ts/components/ui/etherscan_icon.tsx b/packages/website/ts/components/ui/etherscan_icon.tsx
index c1154d3d6..1b032c112 100644
--- a/packages/website/ts/components/ui/etherscan_icon.tsx
+++ b/packages/website/ts/components/ui/etherscan_icon.tsx
@@ -35,6 +35,6 @@ export const EtherScanIcon = (props: EtherScanIconProps) => {
     );
 };
 
-function renderIcon() {
+function renderIcon(): React.ReactNode {
     return <i style={{ color: colors.amber600 }} className="zmdi zmdi-open-in-new" />;
 }
diff --git a/packages/website/ts/components/ui/fake_text_field.tsx b/packages/website/ts/components/ui/fake_text_field.tsx
index 646ae98f6..ac3c30fec 100644
--- a/packages/website/ts/components/ui/fake_text_field.tsx
+++ b/packages/website/ts/components/ui/fake_text_field.tsx
@@ -21,7 +21,7 @@ interface FakeTextFieldProps {
     children?: any;
 }
 
-export function FakeTextField(props: FakeTextFieldProps) {
+export const FakeTextField = (props: FakeTextFieldProps) => {
     return (
         <div className="relative">
             {props.label !== '' && <InputLabel text={props.label} />}
@@ -31,4 +31,4 @@ export function FakeTextField(props: FakeTextFieldProps) {
             <hr style={styles.hr} />
         </div>
     );
-}
+};
diff --git a/packages/website/ts/components/ui/flash_message.tsx b/packages/website/ts/components/ui/flash_message.tsx
index 2cb1fc764..2b866676d 100644
--- a/packages/website/ts/components/ui/flash_message.tsx
+++ b/packages/website/ts/components/ui/flash_message.tsx
@@ -19,7 +19,7 @@ export class FlashMessage extends React.Component<FlashMessageProps, FlashMessag
         showDurationMs: SHOW_DURATION_MS,
         bodyStyle: {},
     };
-    public render() {
+    public render(): React.ReactNode {
         if (!_.isUndefined(this.props.flashMessage)) {
             return (
                 <Snackbar
@@ -34,7 +34,7 @@ export class FlashMessage extends React.Component<FlashMessageProps, FlashMessag
             return null;
         }
     }
-    private _onClose() {
+    private _onClose(): void {
         this.props.dispatcher.hideFlashMessage();
     }
 }
diff --git a/packages/website/ts/components/ui/identicon.tsx b/packages/website/ts/components/ui/identicon.tsx
index bad6c2a78..83c86a144 100644
--- a/packages/website/ts/components/ui/identicon.tsx
+++ b/packages/website/ts/components/ui/identicon.tsx
@@ -15,7 +15,7 @@ export class Identicon extends React.Component<IdenticonProps, IdenticonState> {
     public static defaultProps: Partial<IdenticonProps> = {
         style: {},
     };
-    public render() {
+    public render(): React.ReactNode {
         let address = this.props.address;
         if (_.isEmpty(address)) {
             address = constants.NULL_ADDRESS;
diff --git a/packages/website/ts/components/ui/lifecycle_raised_button.tsx b/packages/website/ts/components/ui/lifecycle_raised_button.tsx
index c85e11884..b06978f16 100644
--- a/packages/website/ts/components/ui/lifecycle_raised_button.tsx
+++ b/packages/website/ts/components/ui/lifecycle_raised_button.tsx
@@ -42,11 +42,11 @@ export class LifeCycleRaisedButton extends React.Component<LifeCycleRaisedButton
             buttonState: ButtonState.READY,
         };
     }
-    public componentWillUnmount() {
+    public componentWillUnmount(): void {
         clearTimeout(this._buttonTimeoutId);
         this._didUnmount = true;
     }
-    public render() {
+    public render(): React.ReactNode {
         if (this.props.isHidden) {
             return <span />;
         }
@@ -77,7 +77,7 @@ export class LifeCycleRaisedButton extends React.Component<LifeCycleRaisedButton
             />
         );
     }
-    public async onClickAsync() {
+    public async onClickAsync(): Promise<void> {
         this.setState({
             buttonState: ButtonState.LOADING,
         });
diff --git a/packages/website/ts/components/ui/menu_item.tsx b/packages/website/ts/components/ui/menu_item.tsx
index 3482f436c..64c0dc49d 100644
--- a/packages/website/ts/components/ui/menu_item.tsx
+++ b/packages/website/ts/components/ui/menu_item.tsx
@@ -24,7 +24,7 @@ export class MenuItem extends React.Component<MenuItemProps, MenuItemState> {
             isHovering: false,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const menuItemStyles = {
             cursor: 'pointer',
             opacity: this.state.isHovering ? 0.5 : 1,
@@ -43,7 +43,7 @@ export class MenuItem extends React.Component<MenuItemProps, MenuItemState> {
             </Link>
         );
     }
-    private _onToggleHover(isHovering: boolean) {
+    private _onToggleHover(isHovering: boolean): void {
         this.setState({
             isHovering,
         });
diff --git a/packages/website/ts/components/ui/party.tsx b/packages/website/ts/components/ui/party.tsx
index 3d94903d1..0d86a6db5 100644
--- a/packages/website/ts/components/ui/party.tsx
+++ b/packages/website/ts/components/ui/party.tsx
@@ -27,7 +27,7 @@ export class Party extends React.Component<PartyProps, PartyState> {
         identiconStyle: {},
         identiconDiameter: IDENTICON_DIAMETER,
     };
-    public render() {
+    public render(): React.ReactNode {
         const label = this.props.label;
         const address = this.props.address;
         const identiconDiameter = this.props.identiconDiameter;
diff --git a/packages/website/ts/components/ui/swap_icon.tsx b/packages/website/ts/components/ui/swap_icon.tsx
index e465a8074..4a6000d1b 100644
--- a/packages/website/ts/components/ui/swap_icon.tsx
+++ b/packages/website/ts/components/ui/swap_icon.tsx
@@ -17,7 +17,7 @@ export class SwapIcon extends React.Component<SwapIconProps, SwapIconState> {
             isHovering: false,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const swapStyles = {
             color: this.state.isHovering ? colors.amber600 : colors.amber800,
             fontSize: 50,
@@ -34,7 +34,7 @@ export class SwapIcon extends React.Component<SwapIconProps, SwapIconState> {
             </div>
         );
     }
-    private _onToggleHover(isHovering: boolean) {
+    private _onToggleHover(isHovering: boolean): void {
         this.setState({
             isHovering,
         });
diff --git a/packages/website/ts/components/ui/token_icon.tsx b/packages/website/ts/components/ui/token_icon.tsx
index ff57a96de..a9ad567ef 100644
--- a/packages/website/ts/components/ui/token_icon.tsx
+++ b/packages/website/ts/components/ui/token_icon.tsx
@@ -11,7 +11,7 @@ interface TokenIconProps {
 interface TokenIconState {}
 
 export class TokenIcon extends React.Component<TokenIconProps, TokenIconState> {
-    public render() {
+    public render(): React.ReactNode {
         const token = this.props.token;
         const diameter = this.props.diameter;
         return (
diff --git a/packages/website/ts/components/visual_order.tsx b/packages/website/ts/components/visual_order.tsx
index 3bf464e92..76a283547 100644
--- a/packages/website/ts/components/visual_order.tsx
+++ b/packages/website/ts/components/visual_order.tsx
@@ -20,7 +20,7 @@ interface VisualOrderProps {
 interface VisualOrderState {}
 
 export class VisualOrder extends React.Component<VisualOrderProps, VisualOrderState> {
-    public render() {
+    public render(): React.ReactNode {
         const allTokens = _.values(this.props.tokenByAddress);
         const makerImage = this.props.makerToken.iconUrl;
         const takerImage = this.props.takerToken.iconUrl;
@@ -62,7 +62,7 @@ export class VisualOrder extends React.Component<VisualOrderProps, VisualOrderSt
             </div>
         );
     }
-    private _renderAmount(assetToken: AssetToken, token: Token) {
+    private _renderAmount(assetToken: AssetToken, token: Token): React.ReactNode {
         const unitAmount = ZeroEx.toUnitAmount(assetToken.amount, token.decimals);
         return (
             <div style={{ fontSize: 13 }}>
diff --git a/packages/website/ts/components/wallet/wallet.tsx b/packages/website/ts/components/wallet/wallet.tsx
index 079c0e3b3..95f31582e 100644
--- a/packages/website/ts/components/wallet/wallet.tsx
+++ b/packages/website/ts/components/wallet/wallet.tsx
@@ -162,15 +162,15 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
             isHoveringSidebar: false,
         };
     }
-    public componentWillMount() {
+    public componentWillMount(): void {
         const trackedTokenAddresses = _.keys(this.state.trackedTokenStateByAddress);
         // tslint:disable-next-line:no-floating-promises
         this._fetchBalancesAndAllowancesAsync(trackedTokenAddresses);
     }
-    public componentWillUnmount() {
+    public componentWillUnmount(): void {
         this._isUnmounted = true;
     }
-    public componentWillReceiveProps(nextProps: WalletProps) {
+    public componentWillReceiveProps(nextProps: WalletProps): void {
         if (
             nextProps.userAddress !== this.props.userAddress ||
             nextProps.networkId !== this.props.networkId ||
@@ -196,11 +196,11 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
             this._fetchBalancesAndAllowancesAsync(newTokenAddresses);
         }
     }
-    public render() {
+    public render(): React.ReactNode {
         const isReadyToRender = this.props.blockchainIsLoaded && this.props.blockchainErr === BlockchainErrs.NoError;
         return <div style={styles.root}>{isReadyToRender && this._renderRows()}</div>;
     }
-    private _renderRows() {
+    private _renderRows(): React.ReactNode {
         const isAddressAvailable = !_.isEmpty(this.props.userAddress);
         return (
             <List style={styles.list}>
@@ -210,7 +210,7 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
             </List>
         );
     }
-    private _renderDisconnectedHeaderRows() {
+    private _renderDisconnectedHeaderRows(): React.ReactElement<{}> {
         const userAddress = this.props.userAddress;
         const primaryText = 'wallet';
         return (
@@ -223,7 +223,7 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
             />
         );
     }
-    private _renderDisconnectedRows() {
+    private _renderDisconnectedRows(): React.ReactElement<{}> {
         return (
             <WalletDisconnectedItem
                 key={DISCONNECTED_ITEM_KEY}
@@ -233,7 +233,7 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
             />
         );
     }
-    private _renderConnectedHeaderRows() {
+    private _renderConnectedHeaderRows(): React.ReactElement<{}> {
         const userAddress = this.props.userAddress;
         const primaryText = utils.getAddressBeginAndEnd(userAddress);
         return (
@@ -246,7 +246,7 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
             />
         );
     }
-    private _renderBody() {
+    private _renderBody(): React.ReactElement<{}> {
         const bodyStyle: React.CSSProperties = {
             ...styles.bodyInnerDiv,
             overflow: this.state.isHoveringSidebar ? 'auto' : 'hidden',
@@ -263,17 +263,17 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
             </ListItem>
         );
     }
-    private _onSidebarHover(event: React.FormEvent<HTMLInputElement>) {
+    private _onSidebarHover(event: React.FormEvent<HTMLInputElement>): void {
         this.setState({
             isHoveringSidebar: true,
         });
     }
-    private _onSidebarHoverOff() {
+    private _onSidebarHoverOff(): void {
         this.setState({
             isHoveringSidebar: false,
         });
     }
-    private _renderFooterRows() {
+    private _renderFooterRows(): React.ReactElement<{}> {
         return (
             <ListItem
                 key={FOOTER_ITEM_KEY}
@@ -302,7 +302,7 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
             />
         );
     }
-    private _renderEthRows() {
+    private _renderEthRows(): React.ReactNode {
         const primaryText = this._renderAmount(
             this.props.userEtherBalanceInWei,
             constants.DECIMAL_PLACES_ETH,
@@ -352,7 +352,7 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
             </div>
         );
     }
-    private _renderTokenRows() {
+    private _renderTokenRows(): React.ReactNode {
         const trackedTokens = this.props.trackedTokens;
         const trackedTokensStartingWithEtherToken = trackedTokens.sort(
             firstBy((t: Token) => t.symbol !== ETHER_TOKEN_SYMBOL)
@@ -361,7 +361,7 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
         );
         return _.map(trackedTokensStartingWithEtherToken, this._renderTokenRow.bind(this));
     }
-    private _renderTokenRow(token: Token, index: number) {
+    private _renderTokenRow(token: Token, index: number): React.ReactNode {
         const tokenState = this.state.trackedTokenStateByAddress[token.address];
         const tokenLink = sharedUtils.getEtherScanLinkIfExists(
             token.address,
@@ -415,7 +415,7 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
             </div>
         );
     }
-    private _renderAccessoryItems(config: AccessoryItemConfig) {
+    private _renderAccessoryItems(config: AccessoryItemConfig): React.ReactElement<{}> {
         const shouldShowWrappedEtherAction = !_.isUndefined(config.wrappedEtherDirection);
         const shouldShowToggle = !_.isUndefined(config.allowanceToggleConfig);
         return (
@@ -431,7 +431,7 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
             </div>
         );
     }
-    private _renderAllowanceToggle(config: AllowanceToggleConfig) {
+    private _renderAllowanceToggle(config: AllowanceToggleConfig): React.ReactNode {
         return (
             <AllowanceToggle
                 networkId={this.props.networkId}
@@ -446,13 +446,13 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
             />
         );
     }
-    private _renderAmount(amount: BigNumber, decimals: number, symbol: string) {
+    private _renderAmount(amount: BigNumber, decimals: number, symbol: string): React.ReactNode {
         const unitAmount = ZeroEx.toUnitAmount(amount, decimals);
         const formattedAmount = unitAmount.toPrecision(TOKEN_AMOUNT_DISPLAY_PRECISION);
         const result = `${formattedAmount} ${symbol}`;
         return <div style={styles.amountLabel}>{result}</div>;
     }
-    private _renderValue(amount: BigNumber, decimals: number, price?: BigNumber) {
+    private _renderValue(amount: BigNumber, decimals: number, price?: BigNumber): React.ReactNode {
         if (_.isUndefined(price)) {
             return null;
         }
@@ -462,7 +462,7 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
         const result = `$${formattedAmount}`;
         return result;
     }
-    private _renderTokenIcon(token: Token, tokenLink?: string) {
+    private _renderTokenIcon(token: Token, tokenLink?: string): React.ReactElement<{}> {
         const tooltipId = `tooltip-${token.address}`;
         const tokenIcon = <TokenIcon token={token} diameter={ICON_DIMENSION} />;
         if (_.isUndefined(tokenLink)) {
@@ -475,7 +475,7 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
             );
         }
     }
-    private _renderWrappedEtherButton(wrappedEtherDirection: Side) {
+    private _renderWrappedEtherButton(wrappedEtherDirection: Side): React.ReactNode {
         const isWrappedEtherDirectionOpen = this.state.wrappedEtherDirection === wrappedEtherDirection;
         let buttonLabel;
         let buttonIcon;
@@ -510,7 +510,7 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
             />
         );
     }
-    private _getInitialTrackedTokenStateByAddress(tokenAddresses: string[]) {
+    private _getInitialTrackedTokenStateByAddress(tokenAddresses: string[]): TokenStateByAddress {
         const trackedTokenStateByAddress: TokenStateByAddress = {};
         _.each(tokenAddresses, tokenAddress => {
             trackedTokenStateByAddress[tokenAddress] = {
@@ -521,7 +521,7 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
         });
         return trackedTokenStateByAddress;
     }
-    private async _fetchBalancesAndAllowancesAsync(tokenAddresses: string[]) {
+    private async _fetchBalancesAndAllowancesAsync(tokenAddresses: string[]): Promise<void> {
         const balanceAndAllowanceTupleByAddress: ItemByAddress<BigNumber[]> = {};
         const userAddressIfExists = _.isEmpty(this.props.userAddress) ? undefined : this.props.userAddress;
         for (const tokenAddress of tokenAddresses) {
@@ -554,7 +554,7 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
             });
         }
     }
-    private async _refetchTokenStateAsync(tokenAddress: string) {
+    private async _refetchTokenStateAsync(tokenAddress: string): Promise<void> {
         await this._fetchBalancesAndAllowancesAsync([tokenAddress]);
     }
     private async _getPriceByAddressAsync(tokenAddresses: string[]): Promise<ItemByAddress<BigNumber>> {
@@ -584,17 +584,17 @@ export class Wallet extends React.Component<WalletProps, WalletState> {
             return {};
         }
     }
-    private _openWrappedEtherActionRow(wrappedEtherDirection: Side) {
+    private _openWrappedEtherActionRow(wrappedEtherDirection: Side): void {
         this.setState({
             wrappedEtherDirection,
         });
     }
-    private _closeWrappedEtherActionRow() {
+    private _closeWrappedEtherActionRow(): void {
         this.setState({
             wrappedEtherDirection: undefined,
         });
     }
-    private _getEthToken() {
+    private _getEthToken(): Token {
         const tokens = _.values(this.props.tokenByAddress);
         const etherToken = _.find(tokens, { symbol: ETHER_TOKEN_SYMBOL });
         return etherToken;
diff --git a/packages/website/ts/components/wallet/wrap_ether_item.tsx b/packages/website/ts/components/wallet/wrap_ether_item.tsx
index a38163770..2ed924bcd 100644
--- a/packages/website/ts/components/wallet/wrap_ether_item.tsx
+++ b/packages/website/ts/components/wallet/wrap_ether_item.tsx
@@ -64,7 +64,7 @@ export class WrapEtherItem extends React.Component<WrapEtherItemProps, WrapEther
             isEthConversionHappening: false,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         const etherBalanceInEth = ZeroEx.toUnitAmount(this.props.userEtherBalanceInWei, constants.DECIMAL_PLACES_ETH);
         const isWrappingEth = this.props.direction === Side.Deposit;
         const topLabelText = isWrappingEth ? 'Convert ETH into WETH 1:1' : 'Convert WETH into ETH 1:1';
@@ -116,20 +116,20 @@ export class WrapEtherItem extends React.Component<WrapEtherItemProps, WrapEther
             />
         );
     }
-    private _onValueChange(isValid: boolean, amount?: BigNumber) {
+    private _onValueChange(isValid: boolean, amount?: BigNumber): void {
         this.setState({
             currentInputAmount: amount,
             currentInputHasErrors: !isValid,
         });
     }
-    private _renderIsEthConversionHappeningSpinner() {
+    private _renderIsEthConversionHappeningSpinner(): React.ReactElement<{}> {
         return this.state.isEthConversionHappening ? (
             <div className="pl1" style={{ paddingTop: 10 }}>
                 <i className="zmdi zmdi-spinner zmdi-hc-spin" />
             </div>
         ) : null;
     }
-    private _renderWrapEtherConfirmationButton() {
+    private _renderWrapEtherConfirmationButton(): React.ReactElement<{}> {
         const isWrappingEth = this.props.direction === Side.Deposit;
         const labelText = isWrappingEth ? 'wrap' : 'unwrap';
         return (
@@ -138,13 +138,13 @@ export class WrapEtherItem extends React.Component<WrapEtherItemProps, WrapEther
                     backgroundColor={colors.wrapEtherConfirmationButton}
                     label={labelText}
                     labelStyle={styles.wrapEtherConfirmationButtonLabel}
-                    onClick={this._wrapEtherConfirmationAction.bind(this)}
+                    onClick={this._wrapEtherConfirmationActionAsync.bind(this)}
                     disabled={this.state.isEthConversionHappening}
                 />
             </div>
         );
     }
-    private async _wrapEtherConfirmationAction() {
+    private async _wrapEtherConfirmationActionAsync(): Promise<void> {
         this.setState({
             isEthConversionHappening: true,
         });
diff --git a/packages/website/ts/lazy_component.tsx b/packages/website/ts/lazy_component.tsx
index 48800c2dd..dce06ed8d 100644
--- a/packages/website/ts/lazy_component.tsx
+++ b/packages/website/ts/lazy_component.tsx
@@ -21,22 +21,22 @@ export class LazyComponent extends React.Component<LazyComponentProps, LazyCompo
             component: undefined,
         };
     }
-    public componentWillMount() {
+    public componentWillMount(): void {
         // tslint:disable-next-line:no-floating-promises
         this._loadComponentFireAndForgetAsync(this.props);
     }
-    public componentWillReceiveProps(nextProps: LazyComponentProps) {
+    public componentWillReceiveProps(nextProps: LazyComponentProps): void {
         if (nextProps.reactComponentPromise !== this.props.reactComponentPromise) {
             // tslint:disable-next-line:no-floating-promises
             this._loadComponentFireAndForgetAsync(nextProps);
         }
     }
-    public render() {
+    public render(): React.ReactNode {
         return _.isUndefined(this.state.component)
             ? null
             : React.createElement(this.state.component, this.props.reactComponentProps);
     }
-    private async _loadComponentFireAndForgetAsync(props: LazyComponentProps) {
+    private async _loadComponentFireAndForgetAsync(props: LazyComponentProps): Promise<void> {
         const component = await props.reactComponentPromise;
         this.setState({
             component,
diff --git a/packages/website/ts/local_storage/local_storage.ts b/packages/website/ts/local_storage/local_storage.ts
index d94e6877b..20a533a91 100644
--- a/packages/website/ts/local_storage/local_storage.ts
+++ b/packages/website/ts/local_storage/local_storage.ts
@@ -1,7 +1,7 @@
 import * as _ from 'lodash';
 
 export const localStorage = {
-    doesExist() {
+    doesExist(): boolean {
         return !!window.localStorage;
     },
     getItemIfExists(key: string): string {
@@ -14,13 +14,13 @@ export const localStorage = {
         }
         return item;
     },
-    setItem(key: string, value: string) {
+    setItem(key: string, value: string): void {
         if (!this.doesExist || _.isUndefined(value)) {
             return;
         }
         window.localStorage.setItem(key, value);
     },
-    removeItem(key: string) {
+    removeItem(key: string): void {
         if (!this.doesExist) {
             return;
         }
diff --git a/packages/website/ts/local_storage/trade_history_storage.tsx b/packages/website/ts/local_storage/trade_history_storage.tsx
index df731236e..cc764d98e 100644
--- a/packages/website/ts/local_storage/trade_history_storage.tsx
+++ b/packages/website/ts/local_storage/trade_history_storage.tsx
@@ -14,7 +14,7 @@ export const tradeHistoryStorage = {
     // Clear all fill related localStorage if we've updated the config variable in an update
     // that introduced a backward incompatible change requiring the user to re-fetch the fills from
     // the blockchain
-    clearIfRequired() {
+    clearIfRequired(): void {
         const lastClearFillDate = localStorage.getItemIfExists(FILL_CLEAR_KEY);
         if (lastClearFillDate !== configs.LAST_LOCAL_STORAGE_FILL_CLEARANCE_DATE) {
             const localStorageKeys = localStorage.getAllKeys();
@@ -26,7 +26,7 @@ export const tradeHistoryStorage = {
         }
         localStorage.setItem(FILL_CLEAR_KEY, configs.LAST_LOCAL_STORAGE_FILL_CLEARANCE_DATE);
     },
-    addFillToUser(userAddress: string, networkId: number, fill: Fill) {
+    addFillToUser(userAddress: string, networkId: number, fill: Fill): void {
         const fillsByHash = this.getUserFillsByHash(userAddress, networkId);
         const fillHash = this._getFillHash(fill);
         const doesFillExist = !_.isUndefined(fillsByHash[fillHash]);
@@ -38,7 +38,7 @@ export const tradeHistoryStorage = {
         const userFillsKey = this._getUserFillsKey(userAddress, networkId);
         localStorage.setItem(userFillsKey, userFillsJSONString);
     },
-    removeFillFromUser(userAddress: string, networkId: number, fill: Fill) {
+    removeFillFromUser(userAddress: string, networkId: number, fill: Fill): void {
         const fillsByHash = this.getUserFillsByHash(userAddress, networkId);
         const fillHash = this._getFillHash(fill);
         const doesFillExist = !_.isUndefined(fillsByHash[fillHash]);
@@ -74,15 +74,15 @@ export const tradeHistoryStorage = {
         const blockNumber = _.parseInt(blockNumberStr);
         return blockNumber;
     },
-    setFillsLatestBlock(userAddress: string, networkId: number, blockNumber: number) {
+    setFillsLatestBlock(userAddress: string, networkId: number, blockNumber: number): void {
         const userFillsLatestBlockKey = this._getFillsLatestBlockKey(userAddress, networkId);
         localStorage.setItem(userFillsLatestBlockKey, `${blockNumber}`);
     },
-    _getUserFillsKey(userAddress: string, networkId: number) {
+    _getUserFillsKey(userAddress: string, networkId: number): string {
         const userFillsKey = `${FILLS_KEY}-${userAddress}-${networkId}`;
         return userFillsKey;
     },
-    _getFillsLatestBlockKey(userAddress: string, networkId: number) {
+    _getFillsLatestBlockKey(userAddress: string, networkId: number): string {
         const userFillsLatestBlockKey = `${FILLS_LATEST_BLOCK}-${userAddress}-${networkId}`;
         return userFillsLatestBlockKey;
     },
diff --git a/packages/website/ts/pages/about/about.tsx b/packages/website/ts/pages/about/about.tsx
index d78cca703..673022329 100644
--- a/packages/website/ts/pages/about/about.tsx
+++ b/packages/website/ts/pages/about/about.tsx
@@ -210,10 +210,10 @@ const styles: Styles = {
 };
 
 export class About extends React.Component<AboutProps, AboutState> {
-    public componentDidMount() {
+    public componentDidMount(): void {
         window.scrollTo(0, 0);
     }
-    public render() {
+    public render(): React.ReactNode {
         return (
             <div style={{ backgroundColor: colors.lightestGrey }}>
                 <DocumentTitle title="0x About Us" />
@@ -284,7 +284,7 @@ export class About extends React.Component<AboutProps, AboutState> {
             </div>
         );
     }
-    private _renderProfiles(profiles: ProfileInfo[]) {
+    private _renderProfiles(profiles: ProfileInfo[]): React.ReactNode {
         const numIndiv = profiles.length;
         const colSize = utils.getColSize(numIndiv);
         return _.map(profiles, profile => {
diff --git a/packages/website/ts/pages/about/profile.tsx b/packages/website/ts/pages/about/profile.tsx
index 4361da103..dd046a8cb 100644
--- a/packages/website/ts/pages/about/profile.tsx
+++ b/packages/website/ts/pages/about/profile.tsx
@@ -22,7 +22,7 @@ interface ProfileProps {
     profileInfo: ProfileInfo;
 }
 
-export function Profile(props: ProfileProps) {
+export const Profile = (props: ProfileProps) => {
     return (
         <div className={`lg-col md-col lg-col-${props.colSize} md-col-6`}>
             <div style={{ maxWidth: 300 }} className="mx-auto lg-px3 md-px3 sm-px4 sm-pb3">
@@ -53,9 +53,9 @@ export function Profile(props: ProfileProps) {
             </div>
         </div>
     );
-}
+};
 
-function renderSocialMediaIcons(profileInfo: ProfileInfo) {
+function renderSocialMediaIcons(profileInfo: ProfileInfo): React.ReactNode {
     const icons = [
         renderSocialMediaIcon('zmdi-github-box', profileInfo.github),
         renderSocialMediaIcon('zmdi-linkedin-box', profileInfo.linkedIn),
@@ -64,7 +64,7 @@ function renderSocialMediaIcons(profileInfo: ProfileInfo) {
     return icons;
 }
 
-function renderSocialMediaIcon(iconName: string, url: string) {
+function renderSocialMediaIcon(iconName: string, url: string): React.ReactNode {
     if (_.isEmpty(url)) {
         return null;
     }
diff --git a/packages/website/ts/pages/documentation/doc_page.tsx b/packages/website/ts/pages/documentation/doc_page.tsx
index be8ae02f4..17efc56ed 100644
--- a/packages/website/ts/pages/documentation/doc_page.tsx
+++ b/packages/website/ts/pages/documentation/doc_page.tsx
@@ -59,7 +59,7 @@ export class DocPage extends React.Component<DocPageProps, DocPageState> {
             docAgnosticFormat: undefined,
         };
     }
-    public componentWillMount() {
+    public componentWillMount(): void {
         const pathName = this.props.location.pathname;
         const lastSegment = pathName.substr(pathName.lastIndexOf('/') + 1);
         const versions = findVersions(lastSegment);
@@ -67,10 +67,10 @@ export class DocPage extends React.Component<DocPageProps, DocPageState> {
         // tslint:disable-next-line:no-floating-promises
         this._fetchJSONDocsFireAndForgetAsync(preferredVersionIfExists);
     }
-    public componentWillUnmount() {
+    public componentWillUnmount(): void {
         this._isUnmounted = true;
     }
-    public render() {
+    public render(): React.ReactNode {
         const menuSubsectionsBySection = _.isUndefined(this.state.docAgnosticFormat)
             ? {}
             : this.props.docsInfo.getMenuSubsectionsBySection(this.state.docAgnosticFormat);
@@ -135,7 +135,7 @@ export class DocPage extends React.Component<DocPageProps, DocPageState> {
             });
         }
     }
-    private _getSourceUrl() {
+    private _getSourceUrl(): string {
         const url = this.props.docsInfo.packageUrl;
         let pkg = docIdToSubpackageName[this.props.docsInfo.id];
         let tagPrefix = pkg;
@@ -155,7 +155,7 @@ export class DocPage extends React.Component<DocPageProps, DocPageState> {
         const sourceUrl = `${url}/blob/${tagPrefix}%40${this.props.docsVersion}/packages${pkg}`;
         return sourceUrl;
     }
-    private _onVersionSelected(semver: string) {
+    private _onVersionSelected(semver: string): void {
         let path = window.location.pathname;
         const lastChar = path[path.length - 1];
         if (_.isFinite(_.parseInt(lastChar))) {
diff --git a/packages/website/ts/pages/faq/faq.tsx b/packages/website/ts/pages/faq/faq.tsx
index 701031d44..c9295d806 100644
--- a/packages/website/ts/pages/faq/faq.tsx
+++ b/packages/website/ts/pages/faq/faq.tsx
@@ -404,10 +404,10 @@ const sections: FAQSection[] = [
 ];
 
 export class FAQ extends React.Component<FAQProps, FAQState> {
-    public componentDidMount() {
+    public componentDidMount(): void {
         window.scrollTo(0, 0);
     }
-    public render() {
+    public render(): React.ReactNode {
         return (
             <div>
                 <DocumentTitle title="0x FAQ" />
@@ -422,7 +422,7 @@ export class FAQ extends React.Component<FAQProps, FAQState> {
             </div>
         );
     }
-    private _renderSections() {
+    private _renderSections(): React.ReactNode {
         const renderedSections = _.map(sections, (section: FAQSection, i: number) => {
             const isFirstSection = i === 0;
             return (
@@ -434,7 +434,7 @@ export class FAQ extends React.Component<FAQProps, FAQState> {
         });
         return renderedSections;
     }
-    private _renderQuestions(questions: FAQQuestion[], isFirstSection: boolean) {
+    private _renderQuestions(questions: FAQQuestion[], isFirstSection: boolean): React.ReactNode {
         const renderedQuestions = _.map(questions, (question: FAQQuestion, i: number) => {
             const isFirstQuestion = i === 0;
             return (
diff --git a/packages/website/ts/pages/faq/question.tsx b/packages/website/ts/pages/faq/question.tsx
index 240dae910..28ea6881a 100644
--- a/packages/website/ts/pages/faq/question.tsx
+++ b/packages/website/ts/pages/faq/question.tsx
@@ -20,7 +20,7 @@ export class Question extends React.Component<QuestionProps, QuestionState> {
             isExpanded: props.shouldDisplayExpanded,
         };
     }
-    public render() {
+    public render(): React.ReactNode {
         return (
             <div className="py1">
                 <Card
@@ -43,7 +43,7 @@ export class Question extends React.Component<QuestionProps, QuestionState> {
             </div>
         );
     }
-    private _onExchangeChange() {
+    private _onExchangeChange(): void {
         this.setState({
             isExpanded: !this.state.isExpanded,
         });
diff --git a/packages/website/ts/pages/landing/landing.tsx b/packages/website/ts/pages/landing/landing.tsx
index a63c24fb7..02ecfa117 100644
--- a/packages/website/ts/pages/landing/landing.tsx
+++ b/packages/website/ts/pages/landing/landing.tsx
@@ -177,14 +177,14 @@ export class Landing extends React.Component<LandingProps, LandingState> {
         };
         this._throttledScreenWidthUpdate = _.throttle(this._updateScreenWidth.bind(this), THROTTLE_TIMEOUT);
     }
-    public componentDidMount() {
+    public componentDidMount(): void {
         window.addEventListener('resize', this._throttledScreenWidthUpdate);
         window.scrollTo(0, 0);
     }
-    public componentWillUnmount() {
+    public componentWillUnmount(): void {
         window.removeEventListener('resize', this._throttledScreenWidthUpdate);
     }
-    public render() {
+    public render(): React.ReactNode {
         return (
             <div id="landing" className="clearfix" style={{ color: colors.grey500 }}>
                 <DocumentTitle title="0x Protocol" />
@@ -218,7 +218,7 @@ export class Landing extends React.Component<LandingProps, LandingState> {
             </div>
         );
     }
-    private _renderHero() {
+    private _renderHero(): React.ReactNode {
         const isSmallScreen = this.state.screenWidth === ScreenWidths.Sm;
         const buttonLabelStyle: React.CSSProperties = {
             textTransform: 'none',
@@ -305,7 +305,7 @@ export class Landing extends React.Component<LandingProps, LandingState> {
             </div>
         );
     }
-    private _renderWhatsNew() {
+    private _renderWhatsNew(): React.ReactNode {
         return (
             <div className="sm-center sm-px1">
                 <a href={WHATS_NEW_URL} target="_blank" className="inline-block text-decoration-none">
@@ -327,7 +327,12 @@ export class Landing extends React.Component<LandingProps, LandingState> {
             </div>
         );
     }
-    private _renderProjects(projects: Project[], title: string, backgroundColor: string, isTitleCenter: boolean) {
+    private _renderProjects(
+        projects: Project[],
+        title: string,
+        backgroundColor: string,
+        isTitleCenter: boolean,
+    ): React.ReactNode {
         const isSmallScreen = this.state.screenWidth === ScreenWidths.Sm;
         const projectList = _.map(projects, (project: Project, i: number) => {
             const isRelayersOnly = projects.length === 12;
@@ -393,7 +398,7 @@ export class Landing extends React.Component<LandingProps, LandingState> {
             </div>
         );
     }
-    private _renderTokenizationSection() {
+    private _renderTokenizationSection(): React.ReactNode {
         const isSmallScreen = this.state.screenWidth === ScreenWidths.Sm;
         return (
             <div className="clearfix lg-py4 md-py4 sm-pb4 sm-pt2" style={{ backgroundColor: colors.grey100 }}>
@@ -424,7 +429,7 @@ export class Landing extends React.Component<LandingProps, LandingState> {
             </div>
         );
     }
-    private _renderProtocolSection() {
+    private _renderProtocolSection(): React.ReactNode {
         const isSmallScreen = this.state.screenWidth === ScreenWidths.Sm;
         return (
             <div className="clearfix pt4" style={{ backgroundColor: colors.heroGrey }}>
@@ -469,7 +474,7 @@ export class Landing extends React.Component<LandingProps, LandingState> {
             </div>
         );
     }
-    private _renderBuildingBlocksSection() {
+    private _renderBuildingBlocksSection(): React.ReactNode {
         const isSmallScreen = this.state.screenWidth === ScreenWidths.Sm;
         const descriptionStyle: React.CSSProperties = {
             fontFamily: 'Roboto Mono',
@@ -526,7 +531,7 @@ export class Landing extends React.Component<LandingProps, LandingState> {
             </div>
         );
     }
-    private _renderBlockChipImage() {
+    private _renderBlockChipImage(): React.ReactNode {
         const isSmallScreen = this.state.screenWidth === ScreenWidths.Sm;
         return (
             <div className="col lg-col-6 md-col-6 col-12 sm-center">
@@ -534,7 +539,7 @@ export class Landing extends React.Component<LandingProps, LandingState> {
             </div>
         );
     }
-    private _renderTokenCloud() {
+    private _renderTokenCloud(): React.ReactNode {
         const isSmallScreen = this.state.screenWidth === ScreenWidths.Sm;
         return (
             <div className="col lg-col-6 md-col-6 col-12 center">
@@ -542,7 +547,7 @@ export class Landing extends React.Component<LandingProps, LandingState> {
             </div>
         );
     }
-    private _renderAssetTypes() {
+    private _renderAssetTypes(): React.ReactNode {
         const isSmallScreen = this.state.screenWidth === ScreenWidths.Sm;
         const assetTypes: AssetType[] = [
             {
@@ -585,7 +590,7 @@ export class Landing extends React.Component<LandingProps, LandingState> {
         });
         return assets;
     }
-    private _renderInfoBoxes() {
+    private _renderInfoBoxes(): React.ReactNode {
         const isSmallScreen = this.state.screenWidth === ScreenWidths.Sm;
         const boxStyle: React.CSSProperties = {
             maxWidth: 253,
@@ -648,7 +653,7 @@ export class Landing extends React.Component<LandingProps, LandingState> {
             </div>
         );
     }
-    private _renderUseCases() {
+    private _renderUseCases(): React.ReactNode {
         const isSmallScreen = this.state.screenWidth === ScreenWidths.Sm;
 
         const useCases: UseCase[] = [
@@ -746,7 +751,7 @@ export class Landing extends React.Component<LandingProps, LandingState> {
             </div>
         );
     }
-    private _renderCallToAction() {
+    private _renderCallToAction(): React.ReactNode {
         const isSmallScreen = this.state.screenWidth === ScreenWidths.Sm;
         const buttonLabelStyle: React.CSSProperties = {
             textTransform: 'none',
@@ -793,7 +798,7 @@ export class Landing extends React.Component<LandingProps, LandingState> {
             </div>
         );
     }
-    private _updateScreenWidth() {
+    private _updateScreenWidth(): void {
         const newScreenWidth = utils.getScreenWidth();
         if (newScreenWidth !== this.state.screenWidth) {
             this.setState({
@@ -801,7 +806,7 @@ export class Landing extends React.Component<LandingProps, LandingState> {
             });
         }
     }
-    private _onLanguageSelected(language: Language) {
+    private _onLanguageSelected(language: Language): void {
         this.props.dispatcher.updateSelectedLanguage(language);
     }
 } // tslint:disable:max-file-line-count
diff --git a/packages/website/ts/pages/not_found.tsx b/packages/website/ts/pages/not_found.tsx
index ff25a35e9..96c73d4ec 100644
--- a/packages/website/ts/pages/not_found.tsx
+++ b/packages/website/ts/pages/not_found.tsx
@@ -21,7 +21,7 @@ const styles: Styles = {
 };
 
 export class NotFound extends React.Component<NotFoundProps, NotFoundState> {
-    public render() {
+    public render(): React.ReactNode {
         return (
             <div>
                 <TopBar blockchainIsLoaded={false} location={this.props.location} translate={this.props.translate} />
diff --git a/packages/website/ts/pages/wiki/wiki.tsx b/packages/website/ts/pages/wiki/wiki.tsx
index edca5834d..720c1cc37 100644
--- a/packages/website/ts/pages/wiki/wiki.tsx
+++ b/packages/website/ts/pages/wiki/wiki.tsx
@@ -69,19 +69,19 @@ export class Wiki extends React.Component<WikiProps, WikiState> {
             isHoveringSidebar: false,
         };
     }
-    public componentDidMount() {
+    public componentDidMount(): void {
         window.addEventListener('hashchange', this._onHashChanged.bind(this), false);
     }
-    public componentWillMount() {
+    public componentWillMount(): void {
         // tslint:disable-next-line:no-floating-promises
         this._fetchArticlesBySectionAsync();
     }
-    public componentWillUnmount() {
+    public componentWillUnmount(): void {
         this._isUnmounted = true;
         clearTimeout(this._wikiBackoffTimeoutId);
         window.removeEventListener('hashchange', this._onHashChanged.bind(this), false);
     }
-    public render() {
+    public render(): React.ReactNode {
         const menuSubsectionsBySection = _.isUndefined(this.state.articlesBySection)
             ? {}
             : this._getMenuSubsectionsBySection(this.state.articlesBySection);
@@ -171,7 +171,7 @@ export class Wiki extends React.Component<WikiProps, WikiState> {
         const sections = _.map(sectionNames, sectionName => this._renderSection(sectionName));
         return sections;
     }
-    private _renderSection(sectionName: string) {
+    private _renderSection(sectionName: string): React.ReactNode {
         const articles = this.state.articlesBySection[sectionName];
         const renderedArticles = _.map(articles, (article: Article) => {
             const githubLink = `${constants.URL_GITHUB_WIKI}/edit/master/${sectionName}/${article.fileName}`;
@@ -227,7 +227,7 @@ export class Wiki extends React.Component<WikiProps, WikiState> {
             }
         }
     }
-    private _getMenuSubsectionsBySection(articlesBySection: ArticlesBySection) {
+    private _getMenuSubsectionsBySection(articlesBySection: ArticlesBySection): { [section: string]: string[] } {
         const sectionNames = _.keys(articlesBySection);
         const menuSubsectionsBySection: { [section: string]: string[] } = {};
         for (const sectionName of sectionNames) {
@@ -237,17 +237,17 @@ export class Wiki extends React.Component<WikiProps, WikiState> {
         }
         return menuSubsectionsBySection;
     }
-    private _onSidebarHover(event: React.FormEvent<HTMLInputElement>) {
+    private _onSidebarHover(event: React.FormEvent<HTMLInputElement>): void {
         this.setState({
             isHoveringSidebar: true,
         });
     }
-    private _onSidebarHoverOff() {
+    private _onSidebarHoverOff(): void {
         this.setState({
             isHoveringSidebar: false,
         });
     }
-    private _onHashChanged(event: any) {
+    private _onHashChanged(event: any): void {
         const hash = window.location.hash.slice(1);
         sharedUtils.scrollToHash(hash, sharedConstants.SCROLL_CONTAINER_ID);
     }
diff --git a/packages/website/ts/redux/dispatcher.ts b/packages/website/ts/redux/dispatcher.ts
index 13e9a10cc..981522360 100644
--- a/packages/website/ts/redux/dispatcher.ts
+++ b/packages/website/ts/redux/dispatcher.ts
@@ -22,47 +22,47 @@ export class Dispatcher {
         this._dispatch = dispatch;
     }
     // Portal
-    public resetState() {
+    public resetState(): void {
         this._dispatch({
             type: ActionTypes.ResetState,
         });
     }
-    public updateNodeVersion(nodeVersion: string) {
+    public updateNodeVersion(nodeVersion: string): void {
         this._dispatch({
             data: nodeVersion,
             type: ActionTypes.UpdateNodeVersion,
         });
     }
-    public updateScreenWidth(screenWidth: ScreenWidths) {
+    public updateScreenWidth(screenWidth: ScreenWidths): void {
         this._dispatch({
             data: screenWidth,
             type: ActionTypes.UpdateScreenWidth,
         });
     }
-    public swapAssetTokenSymbols() {
+    public swapAssetTokenSymbols(): void {
         this._dispatch({
             type: ActionTypes.SwapAssetTokens,
         });
     }
-    public updateOrderSalt(salt: BigNumber) {
+    public updateOrderSalt(salt: BigNumber): void {
         this._dispatch({
             data: salt,
             type: ActionTypes.UpdateOrderSalt,
         });
     }
-    public updateUserSuppliedOrderCache(order: Order) {
+    public updateUserSuppliedOrderCache(order: Order): void {
         this._dispatch({
             data: order,
             type: ActionTypes.UpdateUserSuppliedOrderCache,
         });
     }
-    public updateShouldBlockchainErrDialogBeOpen(shouldBeOpen: boolean) {
+    public updateShouldBlockchainErrDialogBeOpen(shouldBeOpen: boolean): void {
         this._dispatch({
             data: shouldBeOpen,
             type: ActionTypes.UpdateShouldBlockchainErrDialogBeOpen,
         });
     }
-    public updateChosenAssetToken(side: Side, token: AssetToken) {
+    public updateChosenAssetToken(side: Side, token: AssetToken): void {
         this._dispatch({
             data: {
                 side,
@@ -71,7 +71,7 @@ export class Dispatcher {
             type: ActionTypes.UpdateChosenAssetToken,
         });
     }
-    public updateChosenAssetTokenAddress(side: Side, address: string) {
+    public updateChosenAssetTokenAddress(side: Side, address: string): void {
         this._dispatch({
             data: {
                 address,
@@ -80,43 +80,43 @@ export class Dispatcher {
             type: ActionTypes.UpdateChosenAssetTokenAddress,
         });
     }
-    public updateOrderTakerAddress(address: string) {
+    public updateOrderTakerAddress(address: string): void {
         this._dispatch({
             data: address,
             type: ActionTypes.UpdateOrderTakerAddress,
         });
     }
-    public updateUserAddress(address?: string) {
+    public updateUserAddress(address?: string): void {
         this._dispatch({
             data: address,
             type: ActionTypes.UpdateUserAddress,
         });
     }
-    public updateOrderExpiry(unixTimestampSec: BigNumber) {
+    public updateOrderExpiry(unixTimestampSec: BigNumber): void {
         this._dispatch({
             data: unixTimestampSec,
             type: ActionTypes.UpdateOrderExpiry,
         });
     }
-    public encounteredBlockchainError(err: BlockchainErrs) {
+    public encounteredBlockchainError(err: BlockchainErrs): void {
         this._dispatch({
             data: err,
             type: ActionTypes.BlockchainErrEncountered,
         });
     }
-    public updateBlockchainIsLoaded(isLoaded: boolean) {
+    public updateBlockchainIsLoaded(isLoaded: boolean): void {
         this._dispatch({
             data: isLoaded,
             type: ActionTypes.UpdateBlockchainIsLoaded,
         });
     }
-    public addTokenToTokenByAddress(token: Token) {
+    public addTokenToTokenByAddress(token: Token): void {
         this._dispatch({
             data: token,
             type: ActionTypes.AddTokenToTokenByAddress,
         });
     }
-    public removeTokenToTokenByAddress(token: Token) {
+    public removeTokenToTokenByAddress(token: Token): void {
         this._dispatch({
             data: token,
             type: ActionTypes.RemoveTokenFromTokenByAddress,
@@ -127,7 +127,7 @@ export class Dispatcher {
         networkId: number,
         userAddressIfExists: string | undefined,
         sideToAssetToken: SideToAssetToken,
-    ) {
+    ): void {
         this._dispatch({
             data: {
                 tokenByAddress,
@@ -138,36 +138,36 @@ export class Dispatcher {
             type: ActionTypes.BatchDispatch,
         });
     }
-    public updateTokenByAddress(tokens: Token[]) {
+    public updateTokenByAddress(tokens: Token[]): void {
         this._dispatch({
             data: tokens,
             type: ActionTypes.UpdateTokenByAddress,
         });
     }
-    public forceTokenStateRefetch() {
+    public forceTokenStateRefetch(): void {
         this._dispatch({
             type: ActionTypes.ForceTokenStateRefetch,
         });
     }
-    public updateECSignature(ecSignature: ECSignature) {
+    public updateECSignature(ecSignature: ECSignature): void {
         this._dispatch({
             data: ecSignature,
             type: ActionTypes.UpdateOrderECSignature,
         });
     }
-    public updateUserWeiBalance(balance: BigNumber) {
+    public updateUserWeiBalance(balance: BigNumber): void {
         this._dispatch({
             data: balance,
             type: ActionTypes.UpdateUserEtherBalance,
         });
     }
-    public updateNetworkId(networkId: number) {
+    public updateNetworkId(networkId: number): void {
         this._dispatch({
             data: networkId,
             type: ActionTypes.UpdateNetworkId,
         });
     }
-    public updateOrderFillAmount(amount: BigNumber) {
+    public updateOrderFillAmount(amount: BigNumber): void {
         this._dispatch({
             data: amount,
             type: ActionTypes.UpdateOrderFillAmount,
@@ -175,13 +175,13 @@ export class Dispatcher {
     }
 
     // Docs
-    public updateCurrentDocsVersion(version: string) {
+    public updateCurrentDocsVersion(version: string): void {
         this._dispatch({
             data: version,
             type: ActionTypes.UpdateLibraryVersion,
         });
     }
-    public updateAvailableDocVersions(versions: string[]) {
+    public updateAvailableDocVersions(versions: string[]): void {
         this._dispatch({
             data: versions,
             type: ActionTypes.UpdateAvailableLibraryVersions,
@@ -189,30 +189,30 @@ export class Dispatcher {
     }
 
     // Shared
-    public showFlashMessage(msg: string | React.ReactNode) {
+    public showFlashMessage(msg: string | React.ReactNode): void {
         this._dispatch({
             data: msg,
             type: ActionTypes.ShowFlashMessage,
         });
     }
-    public hideFlashMessage() {
+    public hideFlashMessage(): void {
         this._dispatch({
             type: ActionTypes.HideFlashMessage,
         });
     }
-    public updateProviderType(providerType: ProviderType) {
+    public updateProviderType(providerType: ProviderType): void {
         this._dispatch({
             type: ActionTypes.UpdateProviderType,
             data: providerType,
         });
     }
-    public updateInjectedProviderName(injectedProviderName: string) {
+    public updateInjectedProviderName(injectedProviderName: string): void {
         this._dispatch({
             type: ActionTypes.UpdateInjectedProviderName,
             data: injectedProviderName,
         });
     }
-    public updateSelectedLanguage(language: Language) {
+    public updateSelectedLanguage(language: Language): void {
         this._dispatch({
             type: ActionTypes.UpdateSelectedLanguage,
             data: language,
diff --git a/packages/website/ts/redux/reducer.ts b/packages/website/ts/redux/reducer.ts
index a628f65c2..bb8f1472b 100644
--- a/packages/website/ts/redux/reducer.ts
+++ b/packages/website/ts/redux/reducer.ts
@@ -91,7 +91,7 @@ const INITIAL_STATE: State = {
     translate: new Translate(),
 };
 
-export function reducer(state: State = INITIAL_STATE, action: Action) {
+export function reducer(state: State = INITIAL_STATE, action: Action): State {
     switch (action.type) {
         // Portal
         case ActionTypes.ResetState:
diff --git a/packages/website/ts/utils/analytics.ts b/packages/website/ts/utils/analytics.ts
index 37c47c7b0..928e45bc3 100644
--- a/packages/website/ts/utils/analytics.ts
+++ b/packages/website/ts/utils/analytics.ts
@@ -5,10 +5,10 @@ import { utils } from 'ts/utils/utils';
 import * as Web3 from 'web3';
 
 export const analytics = {
-    init() {
+    init(): void {
         ReactGA.initialize(configs.GOOGLE_ANALYTICS_ID);
     },
-    logEvent(category: string, action: string, label: string, value?: any) {
+    logEvent(category: string, action: string, label: string, value?: any): void {
         ReactGA.event({
             category,
             action,
@@ -16,7 +16,7 @@ export const analytics = {
             value,
         });
     },
-    async logProviderAsync(web3IfExists: Web3) {
+    async logProviderAsync(web3IfExists: Web3): Promise<void> {
         await utils.onPageLoadAsync();
         const providerType = !_.isUndefined(web3IfExists)
             ? utils.getProviderType(web3IfExists.currentProvider)
diff --git a/packages/website/ts/utils/translate.ts b/packages/website/ts/utils/translate.ts
index 5148e48ad..39924b6f7 100644
--- a/packages/website/ts/utils/translate.ts
+++ b/packages/website/ts/utils/translate.ts
@@ -42,10 +42,10 @@ export class Translate {
         }
         this.setLanguage(language);
     }
-    public getLanguage() {
+    public getLanguage(): Language {
         return this._selectedLanguage;
     }
-    public setLanguage(language: Language) {
+    public setLanguage(language: Language): void {
         const isLanguageSupported = !_.isUndefined(languageToTranslations[language]);
         if (!isLanguageSupported) {
             throw new Error(`${language} not supported`);
@@ -53,7 +53,7 @@ export class Translate {
         this._selectedLanguage = language;
         this._translation = languageToTranslations[language];
     }
-    public get(key: Key, decoration?: Deco) {
+    public get(key: Key, decoration?: Deco): string {
         let text = this._translation[key];
         if (!_.isUndefined(decoration) && !_.includes(languagesWithoutCaps, this._selectedLanguage)) {
             switch (decoration) {
@@ -77,7 +77,7 @@ export class Translate {
         }
         return text;
     }
-    private _capitalize(text: string) {
+    private _capitalize(text: string): string {
         return `${text.charAt(0).toUpperCase()}${text.slice(1)}`;
     }
 }
diff --git a/packages/website/ts/utils/utils.ts b/packages/website/ts/utils/utils.ts
index 472870f31..bf30f4e04 100644
--- a/packages/website/ts/utils/utils.ts
+++ b/packages/website/ts/utils/utils.ts
@@ -25,15 +25,15 @@ const LG_MIN_EM = 64;
 const MD_MIN_EM = 52;
 
 export const utils = {
-    assert(condition: boolean, message: string) {
+    assert(condition: boolean, message: string): void {
         if (!condition) {
             throw new Error(message);
         }
     },
-    spawnSwitchErr(name: string, value: any) {
+    spawnSwitchErr(name: string, value: any): Error {
         return new Error(`Unexpected switch value: ${value} encountered for ${name}`);
     },
-    isNumeric(n: string) {
+    isNumeric(n: string): boolean {
         return !isNaN(parseFloat(n)) && isFinite(Number(n));
     },
     // This default unix timestamp is used for orders where the user does not specify an expiry date.
@@ -106,13 +106,13 @@ export const utils = {
         };
         return order;
     },
-    async sleepAsync(ms: number) {
-        return new Promise(resolve => setTimeout(resolve, ms));
+    async sleepAsync(ms: number): Promise<NodeJS.Timer> {
+        return new Promise<NodeJS.Timer>(resolve => setTimeout(resolve, ms));
     },
-    deepEqual(actual: any, expected: any, opts?: { strict: boolean }) {
+    deepEqual(actual: any, expected: any, opts?: { strict: boolean }): boolean {
         return deepEqual(actual, expected, opts);
     },
-    getColSize(items: number) {
+    getColSize(items: number): number {
         const bassCssGridSize = 12; // Source: http://basscss.com/#basscss-grid
         const colSize = bassCssGridSize / items;
         if (!_.isInteger(colSize)) {
@@ -120,7 +120,7 @@ export const utils = {
         }
         return colSize;
     },
-    getScreenWidth() {
+    getScreenWidth(): ScreenWidths {
         const documentEl = document.documentElement;
         const body = document.getElementsByTagName('body')[0];
         const widthInPx = window.innerWidth || documentEl.clientWidth || body.clientWidth;
@@ -162,7 +162,7 @@ export const utils = {
     // This checks the error message returned from an injected Web3 instance on the page
     // after a user was prompted to sign a message or send a transaction and decided to
     // reject the request.
-    didUserDenyWeb3Request(errMsg: string) {
+    didUserDenyWeb3Request(errMsg: string): boolean {
         const metamaskDenialErrMsg = 'User denied';
         const paritySignerDenialErrMsg = 'Request has been rejected';
         const ledgerDenialErrMsg = 'Invalid status 6985';
@@ -172,7 +172,7 @@ export const utils = {
             _.includes(errMsg, ledgerDenialErrMsg);
         return isUserDeniedErrMsg;
     },
-    getCurrentEnvironment() {
+    getCurrentEnvironment(): string {
         switch (location.host) {
             case configs.DOMAIN_DEVELOPMENT:
                 return 'development';
@@ -188,7 +188,7 @@ export const utils = {
         const truncatedAddress = `${address.substring(0, 6)}...${address.substr(-4)}`; // 0x3d5a...b287
         return truncatedAddress;
     },
-    hasUniqueNameAndSymbol(tokens: Token[], token: Token) {
+    hasUniqueNameAndSymbol(tokens: Token[], token: Token): boolean {
         if (token.isRegistered) {
             return true; // Since it's registered, it is the canonical token
         }
@@ -269,7 +269,7 @@ export const utils = {
         );
         return isTestNetwork;
     },
-    getCurrentBaseUrl() {
+    getCurrentBaseUrl(): string {
         const port = window.location.port;
         const hasPort = !_.isUndefined(port);
         const baseUrl = `https://${window.location.hostname}${hasPort ? `:${port}` : ''}`;
@@ -302,10 +302,10 @@ export const utils = {
         }
         return parsedProviderName;
     },
-    isDevelopment() {
+    isDevelopment(): boolean {
         return configs.ENVIRONMENT === Environments.DEVELOPMENT;
     },
-    isStaging() {
+    isStaging(): boolean {
         return _.includes(window.location.href, configs.DOMAIN_STAGING);
     },
 };