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-rw-r--r--lib/history.js1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/history.js b/lib/history.js
index 69337dc5..ffed3b96 100644
--- a/lib/history.js
+++ b/lib/history.js
@@ -1,3 +1,4 @@
+'use strict'
// history
// external modules