fix(Build): Exclude server-side cookies library from Webpack build

The client build of a Next.js project with next-redux-cookie-wrapper would previously include the
server-only library `cookies` and the dependencies thereof. Thanks @Pikachews!

Fixes #8

src/index.tsx

@@ -1,7 +1,5 @@
 import { IncomingMessage, ServerResponse } from "http";
 
-import ServerCookies from "cookies";
-import ClientCookies from "cookies-js";
 import { NextComponentType, NextPageContext } from "next";
 import {
   MakeStore,
@@ -24,6 +22,9 @@ import {
 // @ts-ignore No type definitions and we do not want to create a global definition in this package
 import { CookieStorage, NodeCookiesWrapper } from "redux-persist-cookie-storage";
 
+// Import `cookies` only on server side
+const ServerCookies = typeof window === "undefined" ? eval('require("cookies")') : null;
+
 export type CustomPersistConfig<S> = Omit<PersistConfig<S>, "storage" | "key"> &
   Partial<Pick<PersistConfig<S>, "key">>;
 
@@ -162,7 +163,7 @@ export const withReduxCookiePersist = (makeStore: MakeStore, config?: Config) =>
       // Let's persist the store!
       const persistConfig = {
         ...sharedPersistConfig,
-        storage: new CookieStorage(ClientCookies, sharedCookieConfig),
+        storage: new CookieStorage(require("cookies-js"), sharedCookieConfig),
       };
 
       // Note: We do not create a persistor here because we need no rehydration.