From 2cf989d3bb0ce8978275f8e44ac58a55ee52cdb4 Mon Sep 17 00:00:00 2001
From: Luke Childs <lukechilds123@gmail.com>
Date: Thu, 22 Dec 2016 19:21:45 +0700
Subject: [PATCH] Main function returns boolean for cache validity

---
 src/index.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/index.js b/src/index.js
index 0c82758..27d9544 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,6 +1,10 @@
+const isPast = require('date-fns/is_past');
 const addSeconds = require('date-fns/add_seconds');
 
-function expired() {}
+function expired(headers) {
+  const expireDate = expired.on(headers)
+  return isPast(expireDate);
+}
 
 expired.on = headers => {
 	const originDate = new Date(headers.date);