diff --git a/types/cookie/cookie-tests.ts b/types/cookie/cookie-tests.ts
index dd5be0f850..08e4d43519 100644
--- a/types/cookie/cookie-tests.ts
+++ b/types/cookie/cookie-tests.ts
@@ -1,23 +1,21 @@
-
-
 import cookie = require('cookie');
 
 function test_serialize(): void {
-    var retVal: string;
+    let retVal: string;
 
     retVal = cookie.serialize('foo', 'bar');
     retVal = cookie.serialize('foo', 'bar', { httpOnly: true });
 }
 
 function test_parse(): void {
-    var retVal: { [key: string]: string };
+    let retVal: { [key: string]: string };
 
     retVal = cookie.parse('foo=bar; bar=baz;');
     retVal = cookie.parse('foo=bar; bar=baz', { decode: x => x });
 }
 
 function test_options(): void {
-    var serializeOptions: cookie.CookieSerializeOptions = {
+    const serializeOptions: cookie.CookieSerializeOptions = {
         encode: (x: string) => x,
         path: '/',
         expires: new Date(),
@@ -27,7 +25,7 @@ function test_options(): void {
         httpOnly: false
     };
 
-    var parseOptios: cookie.CookieParseOptions = {
+    const parseOptios: cookie.CookieParseOptions = {
         decode: (x: string) => x
     };
 }
diff --git a/types/cookie/index.d.ts b/types/cookie/index.d.ts
index 507eaee01d..bb7fc2cb54 100644
--- a/types/cookie/index.d.ts
+++ b/types/cookie/index.d.ts
@@ -1,15 +1,16 @@
-// Type definitions for cookie v0.3.0
+// Type definitions for cookie 0.3
 // Project: https://github.com/jshttp/cookie
 // Definitions by: Pine Mizune <https://github.com/pine613>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-interface CookieSerializeOptions {
+export interface CookieSerializeOptions {
     /**
      * Specifies the value for the Domain Set-Cookie attribute. By default, no
      * domain is set, and most clients will consider the cookie to apply to only
      * the current domain.
      */
     domain?: string;
+
     /**
      * Specifies a function that will be used to encode a cookie's value. Since
      * value of a cookie has a limited character set (and must be a simple
@@ -20,7 +21,8 @@ interface CookieSerializeOptions {
      * encode a JavaScript string into UTF-8 byte sequences and then URL-encode
      * any that fall outside of the cookie range.
      */
-    encode?: (val: string) => string;
+    encode?(val: string): string;
+
     /**
      * Specifies the `Date` object to be the value for the `Expires`
      * `Set-Cookie` attribute. By default, no expiration is set, and most
@@ -83,7 +85,7 @@ interface CookieSerializeOptions {
     secure?: boolean;
 }
 
-interface CookieParseOptions {
+export interface CookieParseOptions {
     /**
      * Specifies a function that will be used to decode a cookie's value. Since
      * the value of a cookie has a limited character set (and must be a simple
@@ -96,7 +98,7 @@ interface CookieParseOptions {
      * *Note* if an error is thrown from this function, the original, non-decoded
      * cookie value will be returned as the cookie's value.
      */
-    decode?: (val: string) => string;
+    decode?(val: string): string;
 }
 
 /**
diff --git a/types/cookie/tslint.json b/types/cookie/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/cookie/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }