3 files changed, 5 insertions, 5 deletions
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);