upd

- `notFound` removed
- `CookieStore` now has subscribe method

src/configure.ts

@@ -6,7 +6,7 @@ import { Handler, Enhancer, Middleware } from './types';
  * @param enhance Enhancer.
  * @return Enhanced fetch function.
  * @todo Need to get isomorphic fetch interface.
- * @todo Result type should be typeof fetch extended by enhancer (need update enhance mechanism).
+ * @todo Result type should be typeof fetch extended by enhancer? (need update enhance mechanism).
  */
 export function configureFetch<T extends typeof fetch>(
   fetchFn: T,

src/index.ts

@@ -1,5 +1,5 @@
 export type { Handler, Enhancer, Middleware, CookieStore } from './types';
 export { configureFetch, applyMiddleware } from './configure';
-export { html, json, notFound } from './response';
+export { html, json } from './response';
 export { router, route } from './server';
 export { createCookieStore } from './utils';

src/response.ts

@@ -13,7 +13,3 @@ export function json(...[body, options]: ConstructorParameters<typeof Response>)
 
   return new Response(body, { ...options, headers });
 }
-
-export function notFound() {
-  return new Response('Not found', { status: 404 });
-}

src/server.ts

@@ -1,5 +1,4 @@
 import { Handler } from './types';
-import { notFound } from './response';
 
 interface Route {
   is(url: URL): boolean;
@@ -16,7 +15,7 @@ export function router(...routes: Route[]): Handler {
       }
     }
 
-    return notFound();
+    return new Response('Not found', { status: 404 });
   };
 }
 

src/types.ts

@@ -17,4 +17,5 @@ export interface Middleware {
 export interface CookieStore {
   getCookies(): string;
   setCookie(cookie: string): void;
+  subscribe(listener: VoidFunction): VoidFunction;
 }

src/utils.ts

@@ -7,6 +7,7 @@ import type { CookieStore } from './types';
  */
 export function createCookieStore(initialCookies?: string): CookieStore {
   const items: Map<string, string> = new Map();
+  const listeners = new Set<VoidFunction>();
 
   const setCookie = (cookie: string) => {
     // IMPORTANT: separating cookie from its attributes
@@ -37,9 +38,14 @@ export function createCookieStore(initialCookies?: string): CookieStore {
     return list.join('; ');
   };
 
+  const subscribe = (listener: VoidFunction): VoidFunction => {
+    listeners.add(listener);
+    return () => listeners.delete(listener);
+  };
+
   if (initialCookies && initialCookies.length > 0) {
     initialCookies.split('; ').forEach(setCookie);
   }
 
-  return { setCookie, getCookies };
+  return { setCookie, getCookies, subscribe };
 }