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-rw-r--r--src/event.js2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/event.js b/src/event.js
index ddd117cfe..e382de6d2 100644
--- a/src/event.js
+++ b/src/event.js
@@ -9,6 +9,8 @@ define( [
"./selector"
], function( jQuery, document, rnotwhite, slice, dataPriv ) {
+"use strict";
+
var
rkeyEvent = /^key/,
rmouseEvent = /^(?:mouse|pointer|contextmenu|drag|drop)|click/,