diff --git a/types/card-validator/card-validator-tests.ts b/types/card-validator/card-validator-tests.ts
index 79ceda9b38..1b83ee8ecf 100644
--- a/types/card-validator/card-validator-tests.ts
+++ b/types/card-validator/card-validator-tests.ts
@@ -1,31 +1,27 @@
 import valid = require('card-validator');
 
-var numberValidation = valid.number('4111');
+const numberValidation = valid.number('4111');
 
-if (!numberValidation.isPotentiallyValid) {
-
-}
-if (numberValidation.card) {
+if (!numberValidation.isPotentiallyValid && numberValidation.card) {
     numberValidation.card.type;
 }
 
 valid.expirationDate('10/19');
-let dateTest2 = valid.expirationDate({month: '1', year: '2019'})
+const dateTest2 = valid.expirationDate({month: '1', year: '2019'});
 if (dateTest2.isPotentiallyValid) {
     dateTest2.month;
 }
 
-let expirationMonthCheck =  valid.expirationMonth('10');
+const expirationMonthCheck =  valid.expirationMonth('10');
 if (expirationMonthCheck.isPotentiallyValid) {
-    expirationMonthCheck.isValidForThisYear
+    expirationMonthCheck.isValidForThisYear;
 }
 
-let expirationYearCheck =  valid.expirationYear('10');
+const expirationYearCheck =  valid.expirationYear('10');
 if (expirationYearCheck.isPotentiallyValid) {
     expirationYearCheck.isCurrentYear;
 }
 
-
 let postalCodeCheck = valid.postalCode('123');
 
 if (postalCodeCheck.isValid) {
@@ -33,7 +29,7 @@ if (postalCodeCheck.isValid) {
     postalCodeCheck = valid.postalCode('123', {minLength: 5});
 }
 
-let cvvCeck = valid.cvv('1234');
+const cvvCeck = valid.cvv('1234');
 if (cvvCeck.isValid) {
-    valid.cvv('12345', 4)
+    valid.cvv('12345', 4);
 }
diff --git a/types/card-validator/index.d.ts b/types/card-validator/index.d.ts
index 458583588b..2412e7ebd3 100644
--- a/types/card-validator/index.d.ts
+++ b/types/card-validator/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for card-validator
+// Type definitions for card-validator 4.1.0
 // Project: https://github.com/braintree/card-validator
 // Definitions by: Gregory Moore <https://github.com/ChanceM>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
@@ -10,7 +10,7 @@ interface Card {
     isAmex: boolean;
     gaps: number[];
     lengths: number[];
-    code: {name: string, size: number}
+    code: {name: string, size: number};
 }
 
 interface valid {
@@ -35,10 +35,9 @@ interface validExpirationYear extends valid {
     isCurrentYear: boolean;
 }
 
-
-export declare function number(value: string): validNumber;
-export declare function expirationDate(value: string | {month: string, year: string}): validExpirationDate;
-export declare function expirationMonth(value: string): validExpirationMonth;
-export declare function expirationYear(value: string): validExpirationYear;
-export declare function cvv(value: string, maxLength?: number): valid;
-export declare function postalCode(value: string, options?: {minLength?: number}): valid;
+export function number(value: string): validNumber;
+export function expirationDate(value: string | {month: string, year: string}): validExpirationDate;
+export function expirationMonth(value: string): validExpirationMonth;
+export function expirationYear(value: string): validExpirationYear;
+export function cvv(value: string, maxLength?: number): valid;
+export function postalCode(value: string, options?: {minLength?: number}): valid;