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-rw-r--r--js/index.js2
1 files changed, 2 insertions, 0 deletions
diff --git a/js/index.js b/js/index.js
index 785dc32..b6ec4ee 100644
--- a/js/index.js
+++ b/js/index.js
@@ -1,3 +1,5 @@
+'use strict';
+
function cache_refresh(force) {
if ('serviceWorker' in navigator) {
localforage.getItem("epube.cache-timestamp").then(function(stamp) {