feat: add deleteCookie utility (#66)

Co-authored-by: pooya parsa <pyapar@gmail.com>

README.md

@@ -116,6 +116,7 @@ Instead of adding helpers to `req` and `res`, h3 exposes them as composable util
 - `useCookies(req)`
 - `useCookie(req, name)`
 - `setCookie(res, name, value, opts?)`
+- `deleteCookie(res, name, opts?)`
 - `useQuery(req)`
 - `send(res, data, type?)`
 - `sendRedirect(res, location, code=302)`

src/utils/cookie.ts

@@ -42,3 +42,19 @@ export function setCookie (res: ServerResponse, name: string, value: string, ser
   const cookieStr = serialize(name, value, serializeOptions)
   appendHeader(res, 'Set-Cookie', cookieStr)
 }
+
+/**
+ * Set a cookie value by name.
+ * @param res {ServerResponse} A ServerResponse object created by [http.Server](https://nodejs.org/api/http.html#http_class_http_server)
+ * @param name Name of the cookie to delete
+ * @param serializeOptions {CookieSerializeOptions} Cookie options
+ * ```ts
+ * deleteCookie(res, 'SessionId')
+ * ```
+ */
+export function deleteCookie (res: ServerResponse, name: string, serializeOptions?: CookieSerializeOptions) {
+  setCookie(res, name, '', {
+    ...serializeOptions,
+    maxAge: 0
+  })
+}