Fix DropLab in IE11 v1

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/26785

1 files changed, 12 insertions, 0 deletions

diff --git a/app/assets/javascripts/extensions/custom_event.js.es6 b/app/assets/javascripts/extensions/custom_event.js.es6
new file mode 100644
index 00000000000..abedae4c1c7
--- /dev/null
+++ b/app/assets/javascripts/extensions/custom_event.js.es6
@@ -0,0 +1,12 @@
+/* global CustomEvent */
+/* eslint-disable no-global-assign */
+
+// Custom event support for IE
+CustomEvent = function CustomEvent(event, parameters) {
+  const params = parameters || { bubbles: false, cancelable: false, detail: undefined };
+  const evt = document.createEvent('CustomEvent');
+  evt.initCustomEvent(event, params.bubbles, params.cancelable, params.detail);
+  return evt;
+};
+
+CustomEvent.prototype = window.Event.prototype;